Multicast CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 2)

Questions 6–10

1. 6expert · hard

   A large enterprise is deploying PIM-SM with multiple RPs for different group ranges. They are using Auto-RP for RP discovery. The network team notices that some routers are not learning the correct RP for certain groups. What is a common cause of this issue?

   • APIM is not enabled on the RP's loopback interface.
   • BThe group range is not within the 224.0.0.0/4 range.
   • CThe RP is not configured with a loopback interface.
   • DAuto-RP announcements are not being forwarded across all routers because of filtering or TTL limits.
   Reveal Solution Discussion Select an answer first
2. 7expert · hard

   In a PIM-SM network, the last-hop router has switched to the shortest-path tree (SPT) for a particular (S,G) stream. The RP is still receiving the traffic from the source. What is the role of the RP after the SPT switchover?

   • AThe RP stops receiving the traffic because the source sends only to the last-hop router.
   • BThe RP sends a prune to the source to stop the flow.
   • CThe RP continues to receive the traffic but no longer forwards it to the last-hop router.
   • DThe RP becomes the root of the SPT.
   Reveal Solution Discussion Select an answer first
4. 8expert · hard

   A network has two routers connected to the same LAN segment, both running PIM-DM. Both routers are forwarding multicast traffic for the same (S,G) stream to the LAN, causing duplicate packets. The routers exchange PIM assert messages. Which router should win the assert?

   • AThe router with the lowest PIM priority.
   • BThe router with the best unicast route to the source (lowest metric).
   • CThe router that first started forwarding the traffic.
   • DThe router with the highest IP address on the LAN interface.
   Reveal Solution Discussion Select an answer first
5. 9expert · hard · select all that apply

   A network administrator is troubleshooting multicast delivery in a Layer 2 switched network. IGMP snooping is enabled on all switches. However, some receivers are not receiving multicast traffic. Which of the following could be the cause? (Select all that apply.)

   • AThe multicast source is sending to a MAC address that does not map to the group IP address.
   • BThe switch has IGMP snooping disabled on the receiver port.
   • CThe receiver is sending IGMPv3 reports, but the switch only supports IGMPv2 snooping.
   • DThe switch is configured with MVR, and the receiver VLAN is not a member of the multicast VLAN.
   • EThe IGMP querier is not configured on the VLAN, so the switch does not know which ports have members.
   Check answers Discussion Select an answer first
6. 10expert · hard

   A network administrator is configuring PIM-SM with BSR for RP distribution. The network has multiple candidate RPs, but the administrator wants to ensure that a specific router is always elected as the RP for a particular group range. What should be configured?

   • ASet the BSR priority on the candidate RP to be the highest in the domain.
   • BConfigure a static RP on all routers to override BSR.
   • CConfigure the candidate RP with the highest RP priority for that group range.
   • DUse Auto-RP instead of BSR to control RP election.
   Reveal Solution Discussion Select an answer first