ccna discovery final

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  • 8/7/2019 CCNA Discovery final


    CCNA Discovery 3 - FINAL Exam Answers Version 4.0

    By CuEi on 9:20 PM

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    Filed : CCNA Discovery 3 Version 4.0,Introducing Routing, Switching in the Enterprise

    1. In which VTP mode can a switch create VLANs, ignore VTP messages, and not pass local VLAN

    information to other VTP domain members?





    2. What are two characteristics of an extended ACL? (Choose two.)

    IP is used to specify TCP traffic only.

    IP is used to specify TCP and UDP traffic only.

    IP is used to specify all TCP/IP protocols including TCP, UDP, ICMP and routing protocols.

    Traffic can be filtered on source address only.

    Traffic can be filtered on source and destination address only.

    Traffic can be filtered on source and destination address, protocol, and specific port number.

    3. Which two statements are true regarding a PPP connection between two Cisco routers? (Choose


    LCP tests the quality of the link.

    LCP manages compression on the link

    Only a single NCP is allowed between the two routers.

    NCP terminates the link when data exchange is complete.

    With CHAP authentication, the routers exchange plain text passwords.

    4. Assuming VLSM is not being used, what impact will adding the command ip route serial0/0 have on a router that is already operational in a network?

    All packets with a destination address between and will be forwarded

    out serial0/0.

    All packets with a destination address between and will be forwarded

    out serial0/0.

    All packets with a destination address between and will be forwarded

    out serial0/0.

    All packets with a destination address between and will be forwarded

    out serial0/0.

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    Refer to the exhibit. The network is using OSPF as the routing protocol. A network administrator

    issues the show ip ospf neighbor command to check the status of operation. Which statement is

    true? RB has the lowest priority value.

    RC and RD have the lowest router IDs on the network.

    RA has established adjacencies with all neighbor routers.

    RA and RB cannot form an adjacency because they are stuck in the 2-way state.

    6. A sales representative is preparing to send sensitive information to corporate headquarters from

    a hotel room using the Internet. Prior to the trip, the IT staff made the necessary provisions to allow

    secure Internet access. What solution was implemented for the sales representative?


    Frame Relay

    PPP with CHAP authentication

    PPP with PAP authentication


    Refer to the exhibit. A network administrator noticed that the VLAN configuration changes at SW2

    did not propagate to SW3. On the basis of the partial output of the show vtp status command, what

    is the possible cause of the problem?

    VTP V2 mode is disabled.

    SW3 is configured as transparent mode.

    The number of existing VLANs does not match.
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    The configuration revision number does not match.


    Refer to the exhibit. Because of continuing instability of one of the serial links in the OSPF network,

    a network administrator configures router ASBR as shown. Which two statements will be a result of

    this configuration? (Choose two.)

    Traffic intended for destinations across unstable serial links will be forwarded by ASBR even when

    the links are down

    A summary route of will be advertised to the ISP router.

    Serial links in range will be forced into a passive state.

    Networks connected to the unstable serial links will be placed in an unreachable state.

    Negative effects of route flapping will be reduced.

    9. Which two criteria are used by STP to select a root bridge? (Choose two.)

    memory size

    bridge priority

    number of ports

    switch location

    switching speed

    base MAC address

    10. A company is using a Class B IP addressing scheme and expects to need as many as 150

    networks. What is the correct subnet mask to use with the network configuration?

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    What is the term for the value 2172416 that is highlighted in the output of the show ip eigrp

    topology command?

    feasible distance of the successor

    reported distance of the successor

    feasible distance of the feasible successor

    reported distance of the feasible successor


    Refer to the exhibit. RIPv2 is configured in the network shown. Hosts in the network have access to

    all internal networks but do not have Internet access. On which router should the commands,

    shown in the exhibit, be added to provide Internet access for all hosts in the network?





    13. What do companies gain from the services performed at the enterprise edge?

    faster communication with server farms

    stronger security against malicious attacks

    faster communication with Internet destinations

    enhanced performance and reliability through VLANs and redundant trunk links

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    Administrative distance is shown as a column in the neighbor table.


    Refer to the exhibit. Assuming that all three routers are configured with the EIGRP routing protocol

    and sharing information, what information can be gathered from the show command output?

    Router B has EIGRP adjacencies with both router A and C.

    Router B has a fully converged topology table.

    Router B has not formed an adjacency with router A.

    Router B has not formed an adjacency with router C.

    18. Which three statements are true about RSTP? (Choose three.)

    RSTP can fall back to STP to provide support for legacy equipment.

    RSTP and STP have the same number of port states.

    Like PortFast and UplinkFast, RSTP is a proprietary protocol.

    RSTP takes up to 50 seconds to converge.

    RSTP requires a point-to-point, full-duplex connection.

    RSTP views all ports that are not discarding as part of an active topology.


    Refer to the exhibit. A network support technician has been asked to set an IP address on one of

    the FastEthernet interfaces on a new router. What is causing the interface to reject the address?

    The IP address is already in use.

    The technician is using a network address.

    The technician is using the wrong subnet mask for /26

    The technician must enable VLSM on the interface.

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    Refer to the exhibit. A network administrator enters the command ip route s0/0/1 into the router. What will be the result of this configuration?

    A static route pointing to is placed into the routing table.

    A static route to is placed into the routing table if interface FastEthernet0/1 goes


    A static route pointing to is only placed into the routing table if the route to is removed. A static route is not placed into the routing table because a RIP route that includes the destination

    network already exists.


    Refer to the exhibit. R1 is connected to the Internet through its serial 0/0/0 interface. Hosts on the LAN on R1 cannot communicate with hosts on the Internet. What two NAT

    configuration issues might explain this failure? (Choose two.)

    The ip nat pool command has not been applied correctly.

    The inside interface has not been defined on R1.

    The access list does not include the group of IP addresses that are supported by the inside


    The ip address that is assigned to the serial 0/0/0 interface is incorrect

    The outside interface has not been defined on R1.

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    Refer to the exhibit. R1 and R2 are connected via serial interfaces. Both interfaces show that thereis Layer 2 connectivity between them. The administrator verifies that CDP is operational; however,

    pings between the two interfaces are unsuccessful. What is the cause of this connectivity problem?

    no set loopback

    incorrect subnet mask on R2

    incompatible bandwidth

    incorrect IP address on R1

    incompatible encapsulation

    23. Which two statements describe how the information contained in a BPDU is used by a switch?

    (Choose two.)

    to set the duplex mode of a redundant link

    to activate looped paths throughout the network

    to determine the root bridge to prevent loops by sharing routing tables between connected switches

    to determine which ports are placed in forwarding mode

    24. When MD5 authentication is used for OSPF routing protocol authentication, what two facts are

    known about the key? (Choose two.)

    The key passes between routers in plain text.

    The key is used to help generate an encrypted number for authentication.

    The key passes between routers in encrypted form.

    The key is never transmitted.

    The key can be captured by using a packet sniffer.

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    Refer to the exhibit. Users on the network are unable to access any of the servers

    located on the network. Given the network topology and OSPF configuration, what

    two problems exist in this network? (Choose two.) There is a routing loop occurring between all three routers.

    There is a network statement missing.

    Network has an incorrect wildcard mask.

    The OSPF Area configuration is incorrect.

    /23 is an invalid subnet mask for the network.

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    Refer to the exhibit. Which IP addressing scheme would be correct for the network?













    Refer to the exhibit. An administrator is adding a new router to the network. The IP address has been assigned to the connecting serial interface on R2. What IP address must

    the administrator assign to the serial interface of the new router?
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    30. After comparing a previous baseline to current network statistics, the network engineer has

    discovered a significant increase in unwarranted traffic to the extranet. Which two steps simplifyadministration and control the unwanted traffic? (Choose two.)

    define an ACL at the distribution layer to isolate packets

    add an ACL at the router in the enterprise edge to block the traffic

    deploy a Layer 3 switch to contain broadcasts

    connect remote locations directly to the intranet

    configure all hosts with the same default gateway to eliminate unnecessary broadcasts

    deploy one core ISP router to reduce the delay in path determination

    31. Which statement is accurate about the CIR in Frame Relay?

    It is important to purchase a CIR that matches the highest bandwidth requirements of the


    The CIR can be no lower than the port speed of the local loop.

    The CIR defines the contracted maximum rate available from the service provider on the FrameRelay circuit

    It is possible to burst over the CIR if bandwidth is available.

    32. A sales representative is using a wireless connection to make a VoIP call. Which protocol will be

    used to transport the voice packets?





    33. A network administrator wants to deny responses to ping requests. Which ACL statement denies

    ping responses while not affecting other traffic?

    access-list 123 deny tcp any any eq 80

    access-list 123 deny tcp any any eq 20

    access-list 123 deny tcp any any eq 21

    access-list 123 deny icmp any any echo-reply

    access-list 101 deny tcp any any established

    34. Why would a network administrator want to limit the size of failure domains when designing a


    to eliminate the effects of Ethernet collisions

    to reduce the impact of a key device or service failure

    to reduce the impact of Internet congestion on critical traffic

    to eliminate the need to block broadcast packets at the edge of the local network

    35. What are two benefits of implementing VLANs in an enterprise network? (Choose two.)

    eliminates the need for a Layer 3 device

    provides segmentation of broadcast domains

    allows for the propagation of broadcasts from one local network to another

    allows for the logical grouping of devices despite physical location

    prevents issues such as broadcast storms by ensuring a loop free environment

    36. Which three IP addresses are valid host addresses in the network? (Choose


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    Refer to the exhibit. Assuming that the RIPv1 routing protocol is enabled and that all networks are

    being advertised, which statement is true?

    All packets from H1 that are destined to H2 will arrive at H2.

    None of the packets from H1 that are destined to H2 will arrive at H2.

    Approximately half the traffic from H1 that is destined to H2 will reach R3.

    Some of the packets from H1 that are destined to H2 will be sent to the switch that is connectedto network


    Refer to the exhibit. Which route will appear in the routing table? R [120/1] via, 00:00:12, FastEthernet0/1

    R [120/1] via, 00:00:12, FastEthernet0/0

    R [120/2] via, 00:00:12, FastEthernet0/0

    R [120/3] via, 00:00:12, FastEthernet1/0

    R [120/1] via, 00:00:12, FastEthernet1/0

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    Refer to the exhibit. Server7 has been added to the server farm network. The hosts can ping

    Servers 2 and 3 and Server2 and Server3 can ping each other. Server7 cannot ping the other

    servers connected to the switch. What is the cause of this problem?

    The Fa0/1 port on the switch should be in access mode.

    The switch IP address is not on the same subnet as Server7.

    The switch port used for Server7 is not in the same VLAN as Server2 and Server3.

    The Fa0/0 interface of the router has not been configured for subinterfaces to support inter-VLAN


    40. What will be the two wildcard masks required in an extended access list statement that blocks

    traffic to host from the network? (Choose two.) 5

    41. If a modem is being used to connect to an ISP, which WAN connection type is being used?

    leased line

    cell switched

    circuit switched

    packet switched

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    Refer to the exhibit. A network administrator must manually summarize all IP addresses on the POP

    router for the ISP. Which one is the correct summary address?


    Refer to the exhibit. OSPF is enabled and the network has completely converged. Which two routers

    will be designated as DROTHER routers? (Choose two.)





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    Refer to the exhibit. What two conclusions can be drawn from the displayed output? (Choose two.)

    A packet with a destination IP address of will exit the router via the Serial 0/1/0n


    The default administrative distance for EIGRP has been changed.

    Network can be reached through two possible routes of equal cost.

    The addresses on this network were created using VLSM.

    The router connected to Serial 0/1/1 is advertising four separate routes through EIGRP to this



    Refer to the exhibit. What two pieces of information can be gathered from the output of this

    command? (Choose two.) is a manually summarized route.

    All subnets are being advertised because default summarization was disabled.

    The output verifies that EIGRP is advertising only the networks in the same AS.

    The network is directly attached to the router that produced this output.
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    The first configuration command overwrites the second command.

    The first default route will be installed into the routing table if there is traffic with an IP address

    that is destined for the network.

    This is expected because the link to ISP1 is active. If the link to ISP1 goes down, then the first

    default route will be installed into the routing table.

    The first default route cannot be installed into the routing table unless the administrator manually

    disables the second default route with the no ip route command.


    Refer to the exhibit. If R4 is announcing all shown internal networks as a summary address to the

    ISP, which summary address will be most specific?

    49. Which two statements are true about the native VLAN on a switch? (Choose two.)

    It requires a special VLAN ID tag.

    It is unable to be changed to a different VLAN.

    Untagged traffic slows the switching process down

    The native VLAN defaults to VLAN 1 on Cisco Catalyst switches.

    Untagged frames that are received on a trunk become members of this VLAN

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    Refer to the exhibit. A company has recently installed a new switch (S2) into their network.After

    several minutes, the network administrator notices that the new VLAN information is not being

    propagated to the new switch. Given the show vtp status command output, what is the possible

    problem that prevents the information from being received by the new switch?

    VTP version mismatch

    VTP domain name mismatch

    VTP revision number mismatch

    Time synchronization problems


    Refer to the exhibit. All routes in the exhibit are available to a router. Which two routes will be

    placed into the routing table? (Choose two.)





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    RIPv1 has a higher AD than RIPv2 has.

    56. Which bandwidth allocation technique minimizes bandwidth waste by reallocating unused time

    slices to communicating users?






    Refer to the exhibit. What is represented by the Null0 route for the network?

    a child route that is defined

    a parent route that is defined and sourced from a physical interface

    a summary route for advertising purposes, not an actual path

    the result of the no auto-summary command on a router

    58. If an authentication protocol is configured for PPP operation, when is the client or user

    workstation authenticated?

    prior to link establishment

    during the link establishment phase

    before the network layer protocol configuration begins

    after the network layer protocol configuration has ended