ewan practice final exam
TRANSCRIPT
EWAN Practice Final Exam
1
What will be the result of adding the command ip dhcp excluded-address 172.16.4.1 172.16.4.5 to the
configuration of a local router that has been configured as a DHCP server?
Traffic that is destined for 172.16.4.1 and 172.16.4.5 will be dropped by the router.
Traffic will not be routed from clients with addresses between 172.16.4.1 and 172.16.4.5.
The DHCP server function of the router will not issue the addresses between 172.16.4.1 and 172.16.4.5.
The router will ignore all traffic that comes from the DHCP servers with addresses 172.16.4.1 and
172.16.4.5.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.1.4 Configuring a DHCP Server
2
An administrator is configuring a dual stack router with IPv6 and IPv4 using RIPng. The
administrator receives an error message when trying to enter the IPv4 routes into RIPng. What is the
cause of the problem?
RIPng is incompatible with dual-stack technology.
All interfaces have been configured with the incorrect IPv4 addresses.
RIPv1 or RIPv2 needs to be configured in addition to RIPng to successfully use IPv4.
When IPv4 and IPv6 are configured on the same interface, all IPv4 addresses are shut down in favor
of the newer technology.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.3.6 Routing Considerations with IPv6
3
Refer to the exhibit. Which DHCP requests will R1 answer?
all DHCP requests that R1 receives
requests that are broadcast to 10.0.1.255
DNS requests with a destination of 10.0.1.3
requests that are received on the FastEthernet 0/0 interface
requests that come from any networks that are not listed as excluded
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.1.4 Configuring a DHCP Server
4
Refer to the exhibit. A host connected to Fa0/0 is unable to acquire an IP address from the DHCP
server. The output of the debug ip dhcp server command shows "DHCPD: there is no address pool for
10.1.1.1". What is the problem?
The 10.1.1.1 address is already configured on Fa0/0.
The default router for the 10Network pool is incorrect.
The ip helper-address must be added to Fa0/0 interface.
The pool of addresses for the 10Network pool is incorrect.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.1.8 Troubleshooting DHCP
5
Refer to the exhibit. The hosts in network A all have static addresses that are assigned in the
192.168.2.0./24 network. The hosts in network B are DHCP clients in the 192.168.1.0/24 network.
After router R1 has been configured with the statements as shown in the exhibit, the DHCP clients are
reporting that they cannot access any network resources. The hosts with static addresses cannot
access any resources outside network A. What is the problem?
The DHCP scope has the wrong address pool.
The interfaces on R1 are incorrectly addressed.
The assignable DCHP addresses are all excluded.
The DCHP clients are receiving the wrong default router address.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.1.4 Configuring a DHCP Server
6
Refer to the exhibit. R1 is performing NAT overload for the 10.1.1.0/24 inside network. HostA has sent
a packet to Web Server. What is the destination IP address of the return packet from Web Server when
it is received at the NIC on HostA?
10.1.1.2:1234
172.30.20.1:1234
172.30.20.1:3333
192.168.1.2:80
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.2.2 What is NAT?
7
At what physical location does the responsibility for a WAN connection change from the service
provider to the user?
DMZ
local loop
CSU/DSU
demarcation point
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.1.3 Demarcation Point
8
What three statements describe the roles of devices in a WAN? (Choose three.)
A CSU/DSU terminates a digital local loop.
A modem terminates a digital local loop.
A CSU/DSU terminates an analog local loop.
A modem terminates an analog local loop.
A router is commonly considered a DTE device.
A router is commonly considered a DCE device.
Observable Description Max Value
1 correctness of response Option 1, Option 4, and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 3
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
1.2.2 WAN Physical Layer Concepts
9
Refer to the exhibit. Which statement is true about the WAN switch device?
It uses a multiport internetworking device to switch traffic such as Frame Relay, ATM or X.25 over the
WAN.
It provides internetworking and WAN access interface ports that are used to connect to the service
provider network.
It provides termination for the digital signal and ensures connection integrity through error correction
and line monitoring.
It converts the digital signals produced by a computer into voice frequencies that can be transmitted
over the analog lines of the public telephone network.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
1.2.2 WAN Physical Layer Concepts
10
Refer to the exhibit. An administrator is trying to connect Router1, a Cisco router, to a non-Cisco
router using a serial connection. Why is the connection failing?
A loopback is not set.
The interface has been shut down.
The wrong encapsulation is being used.
Queuing cannot be used when connecting to non-Cisco devices.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.1.7 Troubleshooting a Serial Interface
11
Which device encodes data for transmission across the WAN service provider transmission link?
CPE
DTE
DCE
UART
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.1.4 DTE and DCE
12
Refer to the exhibit. Why are the routers unable to establish a PPP session?
The usernames are misconfigured.
The IP addresses are on different subnets.
The clock rate is configured on the wrong end of the link.
The CHAP passwords must be different on the two routers.
Interface serial 0/0/0 on Router1 must connect to interface serial 0/0/1 on Router2.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.4.5 Configuring PPP with Authentication
13
What are the symptoms when the s0/0/0 interface on a router is attached to an operational CSU/DSU
that is generating a clock signal, but the far end router on the point-to-point link has not been
activated?
show controllers indicates cable type DCE V.35. show interfaces s0/0/0 indicates serial down, line
protocol down.
show controllers indicates cable type DCE V.35. show interfaces s0/0/0 indicates serial up, line
protocol down.
show controllers indicates cable type DTE V.35. show interfaces s0/0/0 indicates serial up, line
protocol down.
show controllers indicates cable type DTE V.35. show interfaces s0/0/0 indicates serial down, line
protocol down.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.1.7 Troubleshooting a Serial Interface
14
Refer to the exhibit. Router1 is not able to communicate with its peer that is connected to this
interface. Based on the output as shown, what is the most likely cause?
interface reset
improper LMI type
encapsulation failure
local cable unplugged
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.3 Data Link Layer Troubleshooting
15
Which protocol is used to authenticate connections over serial links securely?
CHAP
HDLC
SLIP
PAP
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.4.1 PPP Authentication Protocols
2.4.3 Challenge Handshake Authentication Protocol (CHAP)
16
Refer to the exhibit. What is placed in the address field in the header of a frame that will travel from
the DC office of ABC Company to the Orlando office?
MAC address of the Orlando router
MAC address of the DC router
192.168.1.25
192.168.1.26
DLCI 100
DLCI 200
Observable Description Max Value
1 correctness of response 2 points for Option 6
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.3 Frame Relay Encapsulation
17
While configuring a Frame Relay connection, when should a static Frame Relay map be used?
the remote router is a non-Cisco router
the local router is configured with subinterfaces
broadcast traffic and multicast traffic over the PVC must be controlled
globally significant rather than locally significant DLCIs are being used
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.5 Frame Relay Address Mapping
18
Refer to the exhibit. Branch A has a Cisco router and Branch B has a non-Cisco router that is using
IETF encapsulation . After the commands that are shown are entered, R2 and R3 fail to establish the
PVC. The R2 LMI is Cisco, and the R3 LMI is ANSI. The LMI is successfully established at both
locations. Why is the PVC failing?
The PVC to R3 must be point-to-point.
LMI types cannot be different on each end of a PVC.
A single port can only support one encapsulation type.
The IETF parameter is missing from the frame-relay map ip 192.168.1.3 203 command.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.5 Frame Relay Address Mapping
19
Refer to the exhibit. Which statement is true about the status of the Frame Relay connection?
The Frame Relay connection is in the process of negotiation.
Only packets with control bit DE set are sent over the PVC. No data traffic traverses the link.
Packets marked as FECN and BECN indicate that a congestion control mechanism is enabled on the
Frame Relay PVC.
The “DLCI USAGE = LOCAL” status indicates that the PVC link is not established between the
interface S0/0/0.1 and the Frame Relay switch.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.3.3 Frame Relay Flow Control
20
Refer to the exhibit. You are a network administrator who has been tasked with completing the Frame
Relay topology that interconnects two remote sites. How should the point-to-point subinterfaces be
configured on HQ to complete the topology?
HQ(config-subif)#frame-relay interface-dlci 103 on Serial 0/0/0.1
HQ(config-subif)#frame-relay interface-dlci 203 on Serial 0/0/0.2
HQ(config-subif)#frame-relay interface-dlci 301 on Serial 0/0/0.1
HQ(config-subif)# frame-relay interface-dlci 302 on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 103 broadcast on Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 203 broadcast on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 301 broadcast on Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 302 broadcast on Serial 0/0/0.2
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.4.1 Configuring Frame Relay Subinterfaces
21
A router in a Frame Relay network needs to forward a message received from a host. What two
methods does the router use to identify the correct VC to forward the message? (Choose two.)
The router forwards the frame to all ports in the network and learns the address from the reply frame.
The destination host IP address is embedded in the DLCI.
The router searches Inverse ARP tables for maps of DLCIs to IP addresses.
A table of static mappings can be searched.
The router broadcasts a request for the required IP address.
Observable Description Max Value
1 correctness of response Option 3 and Option 4 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.5 Frame Relay Address Mapping
22
A company is looking for a WAN solution to connect its headquarters site with four remote sites. What
advantage would dedicated leased lines provide to the customer compared to a shared Frame Relay
solution?
lower cost
lower latency and jitter
variable bandwidth capacity
fewer physical router interfaces
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
1.3.2 Dedicated Connection Link Options
23
Which two functions are provided by the Local Management Interface (LMI) that is used in Frame
Relay networks? (Choose two.)
flow control
error notification
congestion notification
the mapping of DLCIs to network addresses
the sending of keepalive packets to verify operation of the PVC
Observable Description Max Value
1 correctness of response Option 1 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.5 Frame Relay Address Mapping
24
A technician is talking to a colleague at a rival company and comparing DSL transfer rates between
the two companies. Both companies are in the same city, use the same service provider, and have the
same rate/service plan. What is the explanation for why Company A reports higher download speeds
than Company B?
Company B has a higher volume of POTS voice traffic than Company A.
Company B shares the conection to the DSLAM with more clients than Company A.
Company A only uses microfilters on branch locations.
Company A is closer to the service provider.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
6.2.3 DSL
25
Refer to the exhibit. A packet is being sent from Host A to Host B through the VPN tunnel between R1
and R3. When the packet first arrives at R3, what are the source and destination IP addresses of the
packet?
Source 192.168.1.2 - Destination 192.168.4.2
Source 192.168.3.1 - Destination 192.168.3.2
Source 192.168.2.1 - Destination 192.168.3.2
Source 192.168.3.1 - Destination 192.168.4.2
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
6.3.5 VPN Tunneling
26
What are two characteristics of DSL technology? (Choose two.)
Uploads typically offer larger transfer rates than downloads.
Service providers deploy DSL in the local loop of the telephone network.
DSL download rates are reduced by large volumes of POTS voice traffic.
Filters and splitters allow POTS and DSL traffic to share the same medium.
DSL is a shared medium that allows many users to share bandwidth available from the DSLAM.
Observable Description Max Value
1 correctness of response Option 2 and Option 4 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
6.2.3 DSL
27
What is a major characteristic of a worm?
malicious software that copies itself into other executable programs
tricks users into running the infected software
a set of computer instructions that lies dormant until triggered by a specific event
exploits vulnerabilities with the intent of propagating itself across a network
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.1.3 Types of Network Attacks
28
Refer to the exhibit. The network administrator is adding R1 to an existing network. As a part of the
corporate IT procedures, the administrator attempts to back up the router Cisco IOS software of R1
and receives the output shown. The network administrator then attempts unsuccessfully to ping the
TFTP server from the console session. What should be done next to isolate this problem?
From R2, validate that interface Fa0/0 is operational.
From the TFTP server, verify that the software on the TFTP server is operational.
From the TFTP server, confirm there is enough room on the TFTP server for the Cisco IOS software.
From the console session, make sure that R1 has a route to the network where the TFTP server
resides.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.5.3 Managing Cisco IOS Images
29
A technician has been asked to run the Cisco SDM one-step lockdown on the router of a customer.
What will be the result of this process?
The router will download the latest security patches from the specified FTP server.
All security configurations that are offered by the Cisco AutoSecure feature will be automatically
implemented.
All traffic that enters the router is quarantined and checked against the possible security problems
before being forwarded.
The existing router configurations will be examined and all potential security-related configuration
changes will be automatically implemented.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.4.6 Locking Down a Router with Cisco SDM
30
Refer to the exhibit. A network administrator is trying to configure a router to use SDM, but the
network administrator cannot access the SDM interface of the router. What is the cause of the
problem?
The VTY lines are misconfigured.
The HTTP timeout policy is misconfigured.
The authentication method is misconfigured.
The username and password are misconfigured.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.4.2 Configuring Your Router to Support Cisco SDM
31
Which three statements accurately describe attributes of a security policy? (Choose three.)
It creates a basis for legal action if necessary.
It should not be altered once it is implemented.
It defines a process for managing security violations.
It focuses primarily on threats from outside of the organization.
It defines acceptable and unacceptable use of network resources.
It provides step-by-step procedures to harden routers and other network devices.
Observable Description Max Value
1 correctness of response Option 1, Option 3, and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 3
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.1.6 The Enterprise Security Policy
32
Where will a router operating system image be copied after the copy flash: tftp command is issued?
flash
DRAM
NVRAM
remote server
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.5.4 Backing up and Upgrading Software Image
33
When configuring remote access to a router, what is the significance of the no password command on
a VTY line?
Logins are prevented on that line.
No password is required to log in to that line.
The remote user is not allowed to change the password for that line.
The remote user is prompted to change the line password after connecting to the router.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.2.4 Securing Remote Administrative Access to Routers
34
What effect would the Router1(config-ext-nacl)# permit tcp 172.16.4.0 0.0.0.255 any eq www
command have when implemented inbound on the f0/0 interface?
All TCP traffic is permitted, and all other traffic is denied.
The command is rejected by the router because it is incomplete.
All traffic from 172.16.4.0/24 is permitted anywhere on any port.
Traffic originating from 172.16.4.0/24 is permitted to all TCP port 80 destinations.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.3.4 Creating Named Extended ACLs
35
Which statement is true about wildcard masks?
Inverting the subnet mask will always create the wildcard mask.
A wildcard mask identifies a network or subnet bit by using a "1".
The same function is performed by both a wildcard mask and a subnet mask.
When a "0" is encountered in a wildcard mask, the IP address bit must be checked.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.2.3 ACL Wildcard Masking
36
Refer to the exhibit. An ACL called Managers already exists on this router. What happens if the
network administrator issues the commands as shown in the exhibit?
The new ACL overwrites the existing ACL.
The network administrator will receive an error message.
The existing ACL is modified to include the new command.
A second Managers ACL is created that contains only the new command.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.2.8 Editing Named ACLs
37
Refer to the exhibit. The network administrator creates a standard access control list on Router1 to
prohibit traffic from the 172.16.1.0/24 network from reaching the 172.16.2.0/24 network while still
permitting Internet access for all networks. On which router interface and in which direction should it
be applied?
interface Fa0/0, inbound
interface Fa0/0, outbound
interface Fa0/1, inbound
interface Fa0/1, outbound
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.1.8 Where to Place ACLs
38
Refer to the exhibit. The SSH connections between the remote user and the server are failing. The
correct configuration of NAT has been verified. What is the most likely cause of the problem?
SSH is unable to pass through NAT.
There are incorrect access control list entries.
The access list has the incorrect port number for SSH.
The ip helper command is required on S0/0/0 to allow inbound connections.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.5 Transport Layer Troubleshooting
39
Refer to the exhibit. Partial results of the show access-list and show ip interface fastethernet 0/1
commands for router R3 are shown. There are no other ACLs in effect. Host A is unable to telnet to
host B. Which action will correct the problem but still restrict other traffic between the two networks?
Modify the second entry in the list to permit tcp host 192.168.10.10 any eq telnet .
Reverse the order of the TCP protocol statements in the ACL.
Apply the ACL on the FastEthernet 0/0 interface.
Apply the ACL in the inbound direction.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.4.5 Troubleshooting Common ACL Errors
40
Which protocol is implicitly denied at the end of an IPv4 access list?
IP
TCP
UDP
HTTP
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.1.4 ACL Operation
41
What type of ACL can be used to force a user to authenticate to the router before accessing a network?
standard
dynamic
reflexive
time-based
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.4.2 Dynamic ACLs
42
Refer to the exhibit. Which two statements correctly describe how Router1 processes an FTP request
that enters interface S0/0/0 and is destined for an FTP server at IP address 192.168.1.5? (Choose
two.)
The packet does not match an access list condition.
The router matches the incoming packet to the statement that is created from the access-list 201
permit ip any any command.
The router matches the incoming packet to the statement that is created from the access-list 101
permit ip any 192.168.1.0 0.0.0.255 command.
The router matches the incoming packet to the statement that is created from the access-list 201 deny
icmp 192.168.1.0 0.0.0.255 any command.
The packet is allowed into Router1.
Observable Description Max Value
1 correctness of response Option 3 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.1.4 ACL Operation
43
An administrator is unable to receive e-mail. While troubleshooting the problem, the administrator is
able to ping the local mail server IP address successfully from a remote network and can successfully
resolve the mail server name to an IP address via the use of the nslookup command. At what layer of
the OSI model is the problem most likely to be found?
application
transport
network
data link
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.6 Application Layer Troubleshooting
44
Refer to the exhibit. Router1 and Router2 each support separate areas of a data center, and are
connected via a crossover cable. Resources attached to Router1 are unable to connect to resources
attached to Router2. What is the likely cause?
The crossover cable is faulty.
The IP addressing is incorrect.
There is a Layer 2 problem with the router connection.
The upper layers are experiencing an unspecified problem.
One or both of the Ethernet interfaces are not working correctly.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.4 Network Layer Troubleshooting
45
While troubleshooting a problem with an e-mail server, an administrator observes that the switch port
used by the server shows "up, line protocol up". The administrator cannot ping the server. At which
layer of the OSI model is the problem most likely to be found?
application layer
network layer
data link layer
physical layer
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.4 Network Layer Troubleshooting
8.4.6 Application Layer Troubleshooting
46
A network administrator is analyzing the data from a network performance baseline. Which condition
will not be indicated in the baseline data?
the IP addressing scheme of the network
the most heavily used parts of the network
congested areas of the network
error rates in different parts of the network
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.1.3 Why is Establishing a Network Baseline Important?
47
Because of a remote-procedure call failure, a user is unable to access an NFS server. At what layer of
the TCP/IP model does this problem occur?
network layer
data link layer
physical layer
application layer
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.6 Application Layer Troubleshooting
48
Refer to the exhibit. Routers R1 and R2 have been configured with EIGRP in the same autonomous
system. Computers PC1 and PC2 are not able to ping each other. Further investigation has revealed
that the route to 192.168.10.0 is missing from the routing table on R2. What is the cause of the
problem?
The networks are not correctly summarized.
The FastEthernet interfaces on R1 are configured as passive.
The network statements on R2 are incorrectly configured.
EIGRP on R1 does not recognize the 192.168.10.0 network.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.5.2 Troubleshooting Enterprise Networks 2
49
Refer to the exhibit. Routers R1 and R2 are both configured for single area OSPF. Users who are
connected to switch S1 are unable to access database applications that run on servers that are
connected to S2. The network engineer is working remotely and only has the information that is
shown in the exhibit to direct initial troubleshooting efforts. Based on the exhibit, which OSI layer is
the most appropriate to start with for a divide-and-conquer approach?
network layer
application layer
data-link layer
physical layer
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.5.3 Troubleshooting Enterprise Networks 3
50
Refer to the exhibit. An administrator has added the exhibited commands to routers A and B, but no
routing updates are exchanged between the two routers. Based on the information that is given, what
is the likely cause of the problem?
Router A is advertising the wrong network.
The authentication key strings do not match.
The serial interfaces of routers A and B are not on the same network.
The authentication key numbers do not match the EIGRP process number for both routers.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
1 Which address provides an example of an IPv6 link-local address?
FE80::1324:ABCD
2001:2345:AB12:1935::FEFF
2001:1234:0000:9CA::0876/64
1234:ABCD:5678:EF00:9234:AA22:5527:FC35
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.3.2 IPv6 Addressing
2 While configuring a router using RIPng and dual-stack technology with IPv4 and IPv6, the
administrator receives an error message when inputting IPv4 routes. What could cause the error
message?
IPv4 is not compatible with RIPng
RIPng is incompatible with dual-stack technology.
The router interfaces have been configured with incorrect addresses.
When IPv4 and IPv6 are configured on the same interface, all IPv4 addresses are shut down in favor
of the newer technology.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.3.6 Routing Considerations with IPv6
3 Which statement is true about an interface that is configured with the IPv6 address command?
IPv6 traffic-forwarding is enabled on the interface.
A link-local IPv6 address is automatically configured on the interface.
A global unicast IPv6 address is dynamically configured the interface.
Any IPv4 addresses that are assigned to the interface are replaced with an IPv6 address.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.3.7 Configuring IPv6 Addresses
4 What will be the result of adding the command ip dhcp excluded-address 172.16.4.1 172.16.4.5 to the
configuration of a local router that has been configured as a DHCP server?
Traffic that is destined for 172.16.4.1 and 172.16.4.5 will be dropped by the router.
Traffic will not be routed from clients with addresses between 172.16.4.1 and 172.16.4.5.
The DHCP server function of the router will not issue the addresses between 172.16.4.1 and
172.16.4.5.
The router will ignore all traffic that comes from the DHCP servers with addresses 172.16.4.1 and
172.16.4.5.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.1.4 Configuring a DHCP Server
5
Refer to the exhibit. A host that is connected to Fa0/0 is unable to acquire an IP address dynamically
from the DHCP server. The output of the debug ip dhcp server command shows "DHCPD: there is no
address pool for 172.16.1.1". What is the problem?
The default router for the 172Network pool is incorrect.
The 172.16.1.1 address is already configured on Fa0/0.
The pool of addresses for the 172Network pool is incorrect.
The ip helper-address command should be implemented on the Fa0/0 interface.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.1.8 Troubleshooting DHCP
6 What does an access control list determine when used with NAT on a Cisco router?
addresses that are to be translated
addresses that are assigned to a NAT pool
addresses that are allowed out of the router
addresses that are accessible from the inside network
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.2.5 Configuring Dynamic NAT
7 A system administrator must provide Internet connectivity for ten hosts in a small remote office.
The ISP has assigned two public IP addresses to this remote office. How can the system administrator
configure the router to provide Internet access to all ten users at the same time?
Configure static NAT.
Configure dynamic NAT.
Configure static NAT with overload.
Configure dynamic NAT with overload.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
7.2.6 Configuring NAT Overload
8 What three statements describe the roles of devices in a WAN? (Choose three.)
A CSU/DSU terminates a digital local loop.
A modem terminates a digital local loop.
A CSU/DSU terminates an analog local loop.
A modem terminates an analog local loop.
A router is commonly considered a DTE device.
A router is commonly considered a DCE device.
Observable Description Max Value
1 correctness of response Option 1, Option 4, and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 3
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
1.2.2 WAN Physical Layer Concepts
9 At what physical location does the responsibility for a WAN connection change from the service
provider to the user?
DMZ
local loop
CSU/DSU
demarcation point
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.1.3 Demarcation Point
10
Refer to the exhibit. Which statement is true about the WAN switch device?
It uses a multiport internetworking device to switch traffic such as Frame Relay, ATM or X.25 over the
WAN.
It provides internetworking and WAN access interface ports that are used to connect to the service
provider network.
It provides termination for the digital signal and ensures connection integrity through error correction
and line monitoring.
It converts the digital signals produced by a computer into voice frequencies that can be transmitted
over the analog lines of the public telephone network.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
1.2.2 WAN Physical Layer Concepts
11
Refer to the exhibit. A network administrator is using two routers to test a WAN connection . What
can be concluded based on the output of the show running-config commands?
The WAN link is using PPP encapsulation.
The WAN link speed is faster than a T1 line.
The router R2 serves as the DCE for the WAN link.
The WAN link is configured with the Cisco default encapsulation protocol.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.1.5 HDLC Encapsulation
12 Which important piece of troubleshooting information can be discovered about a serial interface
using the show controllers command?
queuing strategy
serial cable type
interface IP address
encapsulation method
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.1.7 Troubleshooting a Serial Interface
13 Which combination of Layer 2 protocol and authentication should be used to establish a link
between a Cisco and a non-Cisco router without sending authentication information in plain text?
HDLC with PAP
HDLC with CHAP
PPP with PAP
PPP with CHAP
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.4.1 PPP Authentication Protocols
2.4.3 Challenge Handshake Authentication Protocol (CHAP)
14 Which three items are LCP options that can be configured for PPP? (Choose three.)
CHAP
Stacker
IPCP
CDPCP
Multilink
Observable Description Max Value
1 correctness of response Option 1, Option 2, and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 3
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.2.5 Establishing a Link with LCP
15 At what point in the PPP connection process does the authentication phase occur?
after NCP establishes Layer 3 parameters
before LCP begins the link establishment process
after the initial Configure-Request message from the link initiator
after the link initiator receives a Configure-Ack message from the responder
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.2.5 Establishing a Link with LCP
16
Refer to the exhibit. Why are the routers unable to establish a PPP session?
The usernames are misconfigured.
The IP addresses are on different subnets.
The clock rate is configured on the wrong end of the link.
The CHAP passwords must be different on the two routers.
Interface serial 0/0/0 on Router1 must connect to interface serial 0/0/1 on Router2.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
2.4.5 Configuring PPP with Authentication
17
Refer to the exhibit. What would be the result of entering the exhibited configuration on a Frame
Relay router?
The local interface DLCI will be set to 102.
All traffic that is destined to 172.16.16.8 will be sent as broadcast.
Only broadcast traffic will be recieved on the Frame Relay interface.
Routing protocol multicast updates can be forwarded across the Frame Relay PVC.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.2.2 Configuring Static Frame Relay Maps
18
Refer to the exhibit. What is placed in the address field in the header of a frame that will travel from
the DC office of ABC Company to the Orlando office?
MAC address of the Orlando router
MAC address of the DC router
192.168.1.25
192.168.1.26
DLCI 100
DLCI 200
Observable Description Max Value
1 correctness of response 2 points for Option 6
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.3 Frame Relay Encapsulation
19 A company uses a PVC with a committed information rate (CIR) of 128 kb/s and a committed burst
information rate (CBIR) of 64 kb/s. The link is used to periodically send updates at a rate of 144 kb/s.
What will happen to the update traffic?
The traffic will be sent, but the company will be charged a penalty.
The traffic will be sent using the additional CBIR and will be guaranteed delivery.
The traffic will be dropped at the CO for exceeding the committed information rate.
The traffic will be sent, but the burst traffic will be marked for discard if congestion is encountered.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.3.2 Paying for Frame Relay
20 Which two functions are provided by the Local Management Interface (LMI) that is used in Frame
Relay networks? (Choose two.)
flow control
error notification
congestion notification
the mapping of DLCIs to network addresses
the sending of keepalive packets to verify operation of the PVC
Observable Description Max Value
1 correctness of response Option 1 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.5 Frame Relay Address Mapping
21
Refer to the exhibit. You are a network administrator who has been tasked with completing the Frame
Relay topology that interconnects two remote sites. How should the point-to-point subinterfaces be
configured on HQ to complete the topology?
HQ(config-subif)#frame-relay interface-dlci 103 on Serial 0/0/0.1
HQ(config-subif)#frame-relay interface-dlci 203 on Serial 0/0/0.2
HQ(config-subif)#frame-relay interface-dlci 301 on Serial 0/0/0.1
HQ(config-subif)# frame-relay interface-dlci 302 on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 103 broadcast on Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 203 broadcast on Serial 0/0/0.2
HQ(config-subif)#frame-relay map ip 172.16.1.1 301 broadcast on Serial 0/0/0.1
HQ(config-subif)#frame-relay map ip 172.16.2.2 302 broadcast on Serial 0/0/0.2
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.4.1 Configuring Frame Relay Subinterfaces
22
Refer to the exhibit. Branch A has a Cisco router. Branch B has a non-Cisco router set for IETF
encapsulation. After the commands shown are entered, R2 and R3 fail to establish the PVC. The R2
LMI is Cisco, and the R3 LMI is ANSI. The LMI is successfully established at both locations. Why is
the PVC failing?
The PVC to R3 must be point-to-point.
LMI types must match on each end of a PVC.
The ietf parameter is missing from the frame-relay map ip 10.10.10.3 203 command.
The PVCs at R2 use different encapsulation types. A single port can only support one encapsulation
type.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.5 Frame Relay Address Mapping
23
Refer to the exhibit. A technician is teaching a trainee to interpret the results of various Frame Relay
troubleshooting commands. What conclusion can be drawn from the output that is shown?
Neighboring routers should use DLCI 177 to reach the Branch router.
DLCI 177 will be used to identify all broadcasts that are sent out the Branch router.
The Branch router has the address 192.168.3.1 configured for the S0/0/0 interface.
To reach 192.168.3.1, the Branch router will use the virtual circuit that is identified by DLCI 177.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.1.5 Frame Relay Address Mapping
24
Refer to the exhibit. Which statement is true about the status of the Frame Relay connection?
The Frame Relay connection is in the process of negotiation.
Only packets with control bit DE set are sent over the PVC. No data traffic traverses the link.
Packets marked as FECN and BECN indicate that a congestion control mechanism is enabled on the
Frame Relay PVC.
The “DLCI USAGE = LOCAL” status indicates that the PVC link is not established between the
interface S0/0/0.1 and the Frame Relay switch.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
3.3.3 Frame Relay Flow Control
25 Which wireless solution can provide mobile users with non line-of-sight broadband Internet access
at speeds comparable to DSL or cable?
Wi-Fi
WiMAX
satellite
Metro Ethernet
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
1.3.5 Internet Connection Options
26 What are two characteristics of DSL technology? (Choose two.)
Uploads typically offer larger transfer rates than downloads.
Service providers deploy DSL in the local loop of the telephone network.
DSL download rates are reduced by large volumes of POTS voice traffic.
Filters and splitters allow POTS and DSL traffic to share the same medium.
DSL is a shared medium that allows many users to share bandwidth available from the DSLAM.
Observable Description Max Value
1 correctness of response Option 2 and Option 4 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
6.2.3 DSL
27
Refer to the exhibit. A packet is being sent from Host A to Host B through the VPN tunnel between R1
and R3. When the packet first arrives at R3, what are the source and destination IP addresses of the
packet?
Source 192.168.1.2 - Destination 192.168.4.2
Source 192.168.3.1 - Destination 192.168.3.2
Source 192.168.2.1 - Destination 192.168.3.2
Source 192.168.3.1 - Destination 192.168.4.2
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
6.3.5 VPN Tunneling
28 What is a major characteristic of a worm?
malicious software that copies itself into other executable programs
tricks users into running the infected software
a set of computer instructions that lies dormant until triggered by a specific event
exploits vulnerabilities with the intent of propagating itself across a network
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.1.3 Types of Network Attacks
29 What is the function of an IDS?
to report the attack after it happens
to stop the attack prior to its completion
to quarantine the virus or worm so as not to infect any other host
to reconfigure the security policy of a firewall to prevent another attack
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.1.4 General Mitigation Techniques
30 When configuring remote access to a router, what is the significance of the no password command
on a VTY line?
Logins are prevented on that line.
No password is required to log in to that line.
The remote user is not allowed to change the password for that line.
The remote user is prompted to change the line password after connecting to the router.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.2.4 Securing Remote Administrative Access to Routers
31 What will be the result of the enable secret command when added at the global configuration mode
on the router?
It will use MD5 encryption to protect the privileged EXEC level access.
It will use type 7 encryption and will encrypt only the privileged EXEC level passwords.
It will use type 7 encryption to prevent all passwords that are displayed on the screen from being
readable.
It will use MD5 encryption to protect the passwords that are only used in the PAP and CHAP
authentication process.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.2.3 Manage Router Security
32
Refer to the exhibit. A network administrator is trying to backup the IOS software on R1 to the TFTP
server. He receives the error message that is shown in the exhibit, and cannot ping the TFTP server
from R1. What action can help to isolate this problem?
Check that R1 has a route to the 10.10.10.0 network.
Verify that the TFTP server software supports binary file transfers.
Make sure that the TFTP server has 192.168.1.1 as its default gateway.
Ensure that the laptop has an IP address in the 192.168.1.0/24 network.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.5.4 Backing up and Upgrading Software Image
33 A network technician accidentally deleted the IOS image from flash and rebooted the router. Which
two options can be used to restore the IOS image? (Choose two.)
Perform a system restore through SDM.
Download the image from a TFTP server through a network connection.
Download the image from a TFTP server through a console connection.
Establish an FTP session through an SSH connection for the image download.
Use the Xmodem protocol to download the image through a console connection.
Observable Description Max Value
1 correctness of response Option 2 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
4.5.5 Recovering Software Images
34
Refer to the exhibit. The network administrator creates a standard access control list to prohibit traffic
from the 192.168.1.0/24 network from reaching the 192.168.2.0/24 network while still permitting
Internet access for all networks. On which router interface and in which direction should it be
applied?
interface fa0/0/0, inbound
interface fa0/0/0, outbound
interface fa0/0/1, inbound
interface fa0/0/1, outbound
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.1.8 Where to Place ACLs
35 What effect would the Router1(config-ext-nacl)# permit tcp 172.16.4.0 0.0.0.255 any eq www
command have when implemented inbound on the f0/0 interface?
All TCP traffic is permitted, and all other traffic is denied.
The command is rejected by the router because it is incomplete.
All traffic from 172.16.4.0/24 is permitted anywhere on any port.
Traffic originating from 172.16.4.0/24 is permitted to all TCP port 80 destinations.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.3.4 Creating Named Extended ACLs
36
Refer to the exhibit. Which two statements correctly describe how Router1 processes an FTP request
that enters interface S0/0/0 and is destined for an FTP server at IP address 192.168.1.5? (Choose
two.)
The packet does not match an access list condition.
The router matches the incoming packet to the statement that is created from the access-list 201
permit ip any any command.
The router matches the incoming packet to the statement that is created from the access-list 101
permit ip any 192.168.1.0 0.0.0.255 command.
The router matches the incoming packet to the statement that is created from the access-list 201 deny
icmp 192.168.1.0 0.0.0.255 any command.
The packet is allowed into Router1.
Observable Description Max Value
1 correctness of response Option 3 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required. 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.1.4 ACL Operation
37
Refer to the exhibit. An ACL numbered 101 already exists on this router. What happens if the network
administrator issues the commands that are shown in the exhibit?
The new ACL overwrites the existing ACL.
The network administrator will receive an error message.
The existing ACL is modified to include the new commands.
A second ACL that is numbered 101 is created and contains only the new commands.
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.2.5 Editing Numbered ACLs
38
Refer to the exhibit. What is the effect of the extended ACL when applied inbound on the S0/0/0
interface on R2?
All IP traffic will be permitted during the specified days and time range.
Both IP and Telnet traffic will be permitted during the specified days and time range.
Only Telnet traffic destined for 172.16.10.0/24 will be permitted during the specified days and time
range.
Telnet traffic will be permitted only during the specified days and time range. All other network traffic
will be permitted any time.
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.4.4 Time-based ACLs
39 Which wildcard mask would specify all IP addresses from 192.168.8.0 through 192.168.15.255?
0.0.0.7
0.0.7.255
0.0.8.255
0.0.15.255
0.0.255.255
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.2.3 ACL Wildcard Masking
40
Refer to the exhibit. The SSH connections between the remote user and the server are failing. The
correct configuration of NAT has been verified. What is the most likely cause of the problem?
SSH is unable to pass through NAT.
There are incorrect access control list entries.
The access list has the incorrect port number for SSH.
The ip helper command is required on S0/0/0 to allow inbound connections.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.5 Transport Layer Troubleshooting
41 A network administrator added two switches and a new VLAN over the past weekend. How can the
administrator determine if the additions and changes improved performance and availability on the
company intranet?
Perform a baseline test and compare the current values to values that were obtained in previous
weeks.
Interview departmental secretaries and determine if they think load time for web pages is improved.
Compare the hit counts on the company web server for the current week to the values that were
recorded from previous weeks.
Performance on the intranet can be determined by monitoring load times of company web pages from
remote sites.
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.1.3 Why is Establishing a Network Baseline Important?
42 A company has its headquarters office in Dallas and five branch offices located in New York,
Chicago, Los Angeles, Seattle, and Atlanta. WAN links are used for communications among offices in
six sites. In planning the WAN links, the network designer is given two requirements: (1) minimize
cost and (2) provide a certain level of WAN link reliability with redundant links. Which topology
should the network designer recommend?
star
full mesh
hierarchical
partial mesh
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.3.4 WAN Topology Considerations
43
Refer to the exhibit. Router1 and Router2 each support separate areas of a data center, and are
connected via a crossover cable. Resources attached to Router1 are unable to connect to resources
attached to Router2. What is the likely cause?
The crossover cable is faulty.
The IP addressing is incorrect.
There is a Layer 2 problem with the router connection.
The upper layers are experiencing an unspecified problem.
One or both of the Ethernet interfaces are not working correctly.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.4 Network Layer Troubleshooting
44 An administrator is unable to receive e-mail. While troubleshooting the problem, the administrator
is able to ping the local mail server IP address successfully from a remote network and can
successfully resolve the mail server name to an IP address via the use of the nslookup command. At
what layer of the OSI model is the problem most likely to be found?
application
transport
network
data link
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.6 Application Layer Troubleshooting
45
Refer to the exhibit. A network technician has been called in to resolve a problem with this network
segment. The symptoms include a loss of connectivity throughout the network segment, high link
utilization, and syslog messages that indicate constant MAC address relearning. What is the likely
cause of these symptoms?
cable fault
faulty NIC card
IP addressing error
spanning tree problem
NAT configuration error
Observable Description Max Value
1 correctness of response 2 points for Option 4
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.4.3 Data Link Layer Troubleshooting
46
Refer to the exhibit. The corporate network that is shown has been assigned network 172.16.128.0/19
for use at branch office LANs. VLSM is not being used. Which subnet mask will allow the most
efficient utilization of IP addresses?
/21
/22
/23
/24
/25
/26
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.5.3 Troubleshooting Enterprise Networks 3
47
Refer to the exhibit. Which VLAN will carry untagged traffic on FastEthernet 0/1?
VLAN 1
VLAN 2
VLAN 11
VLAN 12
VLAN 30
VLAN 999
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.5.3 Troubleshooting Enterprise Networks 3
48
Refer to the exhibit. In the partial router configuration that is shown, what is the purpose of access list
BLOCK_XYZ?
to prevent source IP address spoofing by hosts on the Fa0/0 LAN
to block access by Fa0/0 LAN hosts to all network services beyond the router
to prevent users on the Fa0/0 LAN from opening Telnet sessions on the router
to secure Fa0/0 hosts by allowing only locally sourced traffic into the Fa0/0 LAN
Observable Description Max Value
1 correctness of response 2 points for Option 1
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
5.2.6 Creating Standard Named ACLs
49
Refer to the exhibit. Routers R1 and R2 are both configured for single area OSPF. Users who are
connected to switch S1 are unable to access database applications that run on servers that are
connected to S2. The network engineer is working remotely and only has the information that is
shown in the exhibit to direct initial troubleshooting efforts. Based on the exhibit, which OSI layer is
the most appropriate to start with for a divide-and-conquer approach?
network layer
application layer
data-link layer
physical layer
Observable Description Max Value
1 correctness of response 2 points for Option 3
0 points for any other option 2
This item references content from the following areas:
CCNA Exploration: Accessing the WAN
8.5.3 Troubleshooting Enterprise Networks 3
50
Refer to the exhibit. An administrator has added the exhibited commands to routers A and B, but no
routing updates are exchanged between the two routers. Based on the information that is given, what
is the likely cause of the problem?
Router A is advertising the wrong network.
The authentication key strings do not match.
The serial interfaces of routers A and B are not on the same network.
The authentication key numbers do not match the EIGRP process number for both routers.
Observable Description Max Value
1 correctness of response 2 points for Option 2
0 points for any other option 2