Cisco 642-885 Exam Preparation Study Guide

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Question No. 1

Which two statements regarding Auto RP operations and implementations are correct? (Choose two.)

Answer: A, D


Automatic route processing (Auto-RP) is a feature that automates the distribution of group-to-RP mappings in a PIM network. This feature has these benefits:

It is easy to use multiple RPs within a network to serve different group ranges.

It allows load splitting among different RPs.

It facilitates the arrangement of RPs according to the location of group participants.

It avoids inconsistent, manual RP configurations that might cause connectivity problems.

Multiple RPs can be used to serve different group ranges or to serve as hot backups for each other. To ensure that Auto-RP functions, configure routers as candidate RPs so that they can announce their interest in operating as an RP for certain group ranges. Additionally, a router must be designated as an RP-mapping agent that receives the RP-announcement messages from the candidate RPs, and arbitrates conflicts. The RPmapping agent sends the consistent group-to-RP mappings to all remaining routers. Thus, all routers automatically determine which RP to use for the groups they support auto-rp candidate-rp

To configure a router as a Protocol Independent Multicast (PIM) rendezvous point (RP) candidate that sends messages to the well-known CISCO-RP-ANNOUNCE multicast group (, use the auto-rp candidaterp command in PIM configuration mode. To return to the default behavior, use the no form of this command. auto-rp candidate-rp type interface-path-id scope ttl-value [ group-list access-listname ] [ interval seconds ] [bidir] no auto-rp candidate-rp type interface-path-id scope ttl-value [ group-list access-listname] [ interval seconds ] [bidir]

Question No. 2

Refer to the Cisco IOS-XR BGP configuration exhibit.

Identify two configuration errors. (Choose two.)

Answer: C, E

Question No. 3

Which three statements are correct regarding PIM-SM? (Choose three.)

Answer: A, C, D

Question No. 4

The IPv6 2002::/16 prefix is used in which kind of implementations?

Answer: B

Question No. 5

Refer to the EBGP configuration on a PE IOS-XR router exhibit.

After the EBGP configuration, no routes are accepted from the EBGP peer, nor are any routes advertised to the EBGP peer.

What could be the problem?

Answer: C

Question No. 6

A CRS router that runs Cisco IOS XR has dual routing processors installed. Which solution should be implemented to prevent OSPF adjacency flapping if the primary routing processor fails?

Answer: A

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