Cisco 642-885 Brain Dumps For Preparation

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Question No. 1

Refer to the exhibit for the outputs from an ASR9K router.

Why did the ping fail?

Answer: D

Question No. 2

When implementing interdomain multicast routing, which mechanism can be used to advertise multicast sources in one domain to the other domains, allowing the RPs to build interdomain multicast distribution trees?

Answer: C

Multicast Source Discovery Protocol

Multicast Source Discovery Protocol (MSDP) is a mechanism to connect multiple PIM sparse-mode domains.

MSDP allows multicast sources for a group to be known to all rendezvous point(s) (RPs) in different domains.

Each PIM-SM domain uses its own RPs and need not depend on RPs in other domains.

An RP in a PIM-SM domain has MSDP peering relationships with MSDP-enabled routers in other domains.

Each peering relationship occurs over a TCP connection, which is maintained by the underlying routing system.

MSDP speakers exchange messages called Source Active (SA) messages. When an RP learns about a local active source, typically through a PIM register message, the MSDP process encapsulates the register in an SA message and forwards the information to its peers. The message contains the source and group information for the multicast flow, as well as any encapsulated data. If a neighboring RP has local joiners for the multicast group, the RP installs the S, G route, forwards the encapsulated data contained in the SA message, and sends PIM joins back towards the source. This process describes how a multicast path can be built between domains.

Question No. 3


Which two statements are correct regarding the multicast operations on the router that is the RP? (Choose two.)

Answer: A, C

#show ip mroute

#show ip pim interface

#show ip igmp group

#show ip pim neighbor

Question No. 4

A service provider requests more details about the recent Inter-AS MPLS VPN Option B configuration that was recently deployed. Consider this configuration:

router bgp 3717

address-family vpnv4 unicast

retain route-target all



Which option describes why this particular command is needed?

Answer: D

Question No. 5

Which three methods can be used to reduce the full-mesh IBGP requirement in a service provider core network? (Choose three.)

Answer: A, C, D

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