Cisco 642-885 Practice Exam Questions Avaialble

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Question No. 1

When implementing Anycast RP, the RPs are also required to establish which kind of peering with each other?

Answer: C

http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.html

Using Anycast RP is an implementation strategy that provides load sharing and redundancy in Protocol Independent Multicast sparse mode (PIM-SM) networks. Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup routers for each other. Multicast Source Discovery Protocol (MSDP) is the key protocol that makes Anycast RP possible.

Question No. 2

Which command set should be used for a 6to4 tunnel in a Cisco IOS XE router, considering the border interface with IPv4 address of 209.165.201.2?

Answer: B

Question No. 3

Which two statements correctly describe the RPF check when a multicast packet arrives at a router? (Choose two.)

Answer: A, D

Reverse Path Forwarding (RPF)

RPF is a fundamental concept in multicast routing that enables routers to correctly forward multicast traffic down the distribution tree. RPF makes use of the existing unicast routing table to determine the upstream and downstream neighbors. A router will only forward a multicast packet if it is received on the upstream interface.

This RPF check helps to guarantee that the distribution tree will be loop free.

RPF Check

When a multicast packet arrives at a router, the router will perform an RPF check on the packet. If the RPF check is successful, the packet will be forwarded. Otherwise it will be dropped.

For traffic flowing down a source tree, the RPF check procedure works as follows:

Step 1. Router looks up the source address in the unicast routing table to determine if it has arrived on the interface that is on the reverse path back to the source.

Step 2. If packet has arrived on the interface leading back to the source, the RPF check is successful and the packet will be forwarded.

Step 3. If the RPF check in 2 fails, the packet is dropped.

Question No. 4

Which multicast implementation is preferred for traffic that is required by a small number of receivers across a large distributed network?

Answer: C

Question No. 5

Refer to the exhibit.

XR4 must protect itself from a DOS attack against its BGP process from R1 by using the TTL security feature. Which configuration achieves this goal?

Answer: A

Question No. 6

Which multicast routing protocol is used to forward multicast data along the optimal path from source to receivers?

Answer: C

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