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2021 Oct 642-885 sample question
Q21. Which two BGP mechanisms are used to prevent routing loops when using a design with redundant route reflectors? (Choose two.)
A. Cluster-list
B. AS-Path
C. Originator ID
D. Community
E. Origin
Answer: A,C
Q22. Which mechanism is used by an IPv6 multicast receiver to join an IPv6 multicast group?
A. IGMP report
B. IGMP join
C. MLD report
D. General query
E. PIM join
Answer: C
Q23. Which three statements regarding the BGP operations are correct? (Choose three)
A. PE5 will set the local preferences 200 on all the prefixes sent to CE5
B. PE5 will set the local preference to 200 on all the prefixes learned from CE5
C. CE5 has received 5 prefixes from the PE5 EBGP peer
D. CE5 has the BGP scan interval set to 30 seconds E. CE5 is announcing the 192.168.55.0/24 prefix via EBGP to the PE5 EBGP peer
F. The AS-Path to reach the 209.165.202.128/27 prefix from CE5 is: 64500 64497 64498
Answer: C,E,F #sh ip bgp | be Network #sh ip bgp #show ip bgp neighbors
Q24. The IPv6 2002::/16 prefix is used in which kind of implementations?
A. 6RD
B. 6to4
C. NAT64
D. IPv6 Multicast
Answer: B
Q25. Which three statements are correct regarding the various multicast groups? (Choose three.)
A. Currently there is no source sending traffic to the 224.1.1.1 multicast group
B. PE5 has a Null OILforthe (*,224.0.1.40) entry
C. PE5 has a Null OILforthe (*,224.1.1.1) entry
D. CE5 has joined the 224.0.1.40 multicast group
E. CE5 has a Null OILforthe (*,224.1.1.1) entry
Answer: C,D,E #show ip mroute
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Q26. When verifying multicast configurations and operations on Cisco IOS-XR routers, which two statements regarding show commands are correct? (Choose two.)
A. Use the show route ipv4 multicast command to display the incoming and outgoing interface lists for each of the joined multicast groups
B. Use the show pim rpf command to display the RPF information for the RP or for the multicast source
C. Use the show mrib route command to display the (*,G) and (S,G) states information on the router
D. Use the show mrib route command to display the configured static multicast routes
Answer: B,C
Q27. On the PE, which two statements are correct regarding the(192.168.156.60,224.1.1.1) entry? (Choose two,)
A. The RPF neighbor points towards the RP
B. The RPF neighbor is reachable overthe Gi0/0/0/1 interface
C. The OIL contains the GiO/0/0/0 interface
D. The IIL is Null
Q28. RAG DROP
Answer:
Any Source Multicast - Uses RP's as the root of the shared tree for a multicast group,ONly (S,G)
state is build between the source and the recevier, Spport SPT Switchover
Source Specific Multicast - Uses (*,G) joins as well as (S,G) Joins , Requires IGMPV3 Support,
Hosts learn the multicast source address via out-of-banf mechanism
Q29. Which two statements regarding Auto RP operations and implementations are correct? (Choose two.)
A. Candidate RPs send RP announcements to the 224.0.1.39 multicast group, and the mapping agents send RP discovery messages to the 224.0.1.40 multicast group
B. Every PIM-SM router must be configured with the RP mapping agent IP address
C. Candidate RPs learn the IP address of the mapping agents via periodic RP discovery messages
D. Administrative scoping can be configured to limit the scope of the RP announcements
E. A Reverse Path Forwarding check is done on the RP discovery messages
F. RP discovery messages are flooded hop by hop throughout the network as multicast to the all PIM routers multicast group with a TTL of 1
Answer: A,D
Q30. The following Cisco IOS-XR configuration command will globally enable which multicast process(es) on the router?
RP/0/RP0/CPU0:router(config)# multicast-routing
A. IGMP only
B. PIM only
C. IGMP and MLD only
D. PIM and IGMP only
E. PIM and IGMP and MLD
Answer: E