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Cisco Exam 642-885

Deploying Cisco Service Provider Advanced Network Routing

Version: 7.0

[ Total Questions: 131 ]

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Refer to the Cisco IOS-XR show output exhibit.

A. The [ ] indicates the configuration has a problem B. The [ ] indicates the 10.1.1.1 neighbor peering session has not been established C. The [ ] indicates the configuration was not inherited from a group D. The [ ] indicates the configuration has not been committed E. The [ ] indicates the corresponding BGP peer configuration has a mismatchconfiguration

Answer: C

Explanation:

show bgp neighbors

Use the show bgp neighbors command to display information about the BGP configuration

for neighbors.

•Use the configuration option to display the effective configuration for the neighbor,

including any settings that have been inherited from session groups, neighbor groups, or

af-groups used by this neighbor.

•Use the inheritance option to display the session groups, neighbor groups, and af-groups

from which this neighbor inherits configuration settings.

The following example displays sample output from the show bgp af-group command using

the configuration keyword. This example shows where each configuration item was

inherited from. The default-originate command was configured directly on this address

family group (indicated by [ ]). The remove-private-as command was inherited from address

family group GROUP_2, which in turn inherited from address family group GROUP_3:

Question No : 1

2

Given the partial BGP configuration, which configuration correctly completes the CiscoIOS-XR route reflector configuration where both the 1.1.1.1 and 2.2.2.2 routers are theclients and the 3.3.3.3 router is a non-client IBGP peer? A. neighbor 1.1.1.1 remote-as 65123

neighbor 2.2.2.2 remote-as 65123

neighbor 3.3.3.3 remote-as 65123 B. neighbor 1.1.1.1

Question No : 2

3

address-family ipv4 unicast remote-as 65123

neighbor 2.2.2.2 address-family ipv4 unicast remote-as 65123

neighbor 3.3.3.3 address-family ipv4 unicast remote-as 65123 C. neighbor 1.1.1.1 remote-as 65123 address-family ipv4 unicast

neighbor 2.2.2.2 remote-as 65123 address-family ipv4 unicast

neighbor 3.3.3.3 remote-as 65123 D. neighbor 1.1.1.1 remote-as 65123 neighbor 1.1.1.1 route-reflector-client neighbor 2.2.2.2 remote-as 65123 neighbor 2.2.2.2 route-reflector-client neighbor 3.3.3.3 remote-as 65123

Answer: C

In which four ways does DHCPv6 differ from DHCPv4? (Choose four.) A. DHCPv6 uses the same message types as DHCPv4. B. DHCPv4 functions without external protocols. C. A host discovers a DHCPv6 server by using a DHCP Discover packet. D. A hosts discovers a DHCPv6 server by using a DHCP Solicit packet. E. A DHCPv6 server replies with a DHCP Offer packet. F. A DHCP server replies with a DHCP Advertise message. G. An IPv6 host can request multiple addresses at the same time from a DHCPv6 server. H. An IPv6 host can request only one IP address at a time from a DHCPv6 server.

Answer: B,D,F,G

Question No : 3

4

Which optionshowsthe equivalent multicast MAC address mapping of multicast address239.210.101.190? A. B. C. D.

Answer: A

Which three statements are correct regarding PIM-SM? (Choose three.) A. There are three ways to configure the RP: Static RP, Auto-RP, or BSR B. PIM-SM only uses the RP rooted shared tree and has no option to switch over to theshortest path tree C. Different RPs can be configured for different multicast groups to increase RP scalability D. Candidate RPs and RP mapping agents are configured to enable Auto-RP E. PIM-SM uses the implicit join model

Answer: A,C,D

What is one of the configuration errors within an AS that can stop a Cisco IOS-XR routerfrom announcing certain prefixes to its EBGP peers? A. Some prefixes were mistagged with the no-export BGP community B. Some prefixes were set with an MED of 0 C. The outbound BGP route policy only has set actions defined without any pass actions

D. The inbound BGP route policy only has set actions defined without any pass actions

Answer: A

Question No : 4

Question No : 5

Question No : 6

5

A. B. Type of Service C. D. E. EXP

Answer: C

Explanation:

The Traffic Class field is an 8 bit field that is used to signify the importance of the data

contained within this specific packet. With IPv4, this information was signified with the TOS

field and supported both IP precedence and Differentiated Services Code Point (DSCP).

The Traffic Class field used with IPv6 supports DSCP solely; this specification uses the first

6 bits to indicate the Per Hop Behavior (PHB) of the contained data; these PHB’s are

Which four statements are correct regarding MSDP configurations and operations?(Choose four.) A. The MSDP peers are also typically the RPs in respective routing domains. B. SA messages are flooded to all other MSDP peers without any restrictions C. On Cisco IOS, IOS-XE, and IOS-XR, the router can be configured to cache the SAmessages to reduce the join latency D. SA messages are used to advertise active sources in a domain E. MSDP establishes neighbor relationships with other MSDP peers using TCP port 639 F. MSDP peerings on Cisco IOS, IOS-XE, and IOS-XR support MD5 or SHA1

Answer: A,C,D,E

Question No : 7

Question No : 8

Question No : 9

6

Which protocol can be used to secure multicast in a group multicast solution where groupkey management is needed for secure key exchange? A. DOI B. ISAKMP C. GDOI D. IPsec

Answer: C

Which types of multicast distribution tree can PIM-SM use? A. Only shared tree rooted at the source B. Only shared tree rooted at the RP C. Only shortest path tree rooted at the RP D. Shared tree rooted at the source and shortest path tree switchover E. Shared tree rooted at the RP and shortest path tree switchover F. Shared tree rooted at the first-hop router and shortest path tree rooted at the RP

Answer: E

Which two options are thecommon methods for implementing Site of Origin on Cisco IOSXE routers for loop avoidance in multihome BGP customers? (Choose two.) A. Configure the route-map in command on the CE BGP neighbor. B. Configure Site of Origin directly on the CE BGP neighbor command. C. Configure site-map on VRF interface and redistribution of iBGP. D. Configure site-map on VRF interface and network command. E. Configure the route-map out command on the P router.

Answer: A,B

Question No : 10

Question No : 11

Question No : 12

7

Which two statements are correct regarding the multicast operations on the router that isthe RP? (Choose two.) A. It is using IGMPv3 B. The IGMP query interval is set to 125 seconds C. It is using the IPv4 unicast routing table to perform the RPF checks

9

D. Static multicast routes are configured on the RP

Answer: A,C

Explanation: #show ip mroute

#show ip pim interface

#show ip igmp group

#show ip pim neighbor

Which statement correctly explains the bgp graceful-restart command? A. This command is used to enable NSR and is entered on the NSR-capable router, andalso on any NSR-aware peer B. This command is used to enable NSF and is entered on the NSF-capable router, andalso on any NSF-aware peer C. This command is only required on the NSF-capable routers to enable BGP gracefulrestart with the BGP peers D. This command is only required on the NSF-aware routers to enable BGP graceful restartwith the BGP peers E. This command is only required on the NSR-capable routers to enable BGP gracefulrestart with the BGP peers

Answer: B

Explanation:

Graceful restart is supported in recent versions of Cisco IOS software (12.0S) and is

supported in Cisco IOS

XR software. Graceful restart is the mechanism by which BGP routing peers avoid changes

to their forwarding

paths following a switchover. If the BGP peer has received this capability, it is aware that

the device sending

Question No : 13

10

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