IGMP JN0-664 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A Layer 2 switch in a service provider network is experiencing high CPU utilization because multicast traffic is being flooded to all ports. The switch supports IGMP snooping. After enabling IGMP snooping, you notice that multicast traffic is still being flooded to all ports. What is the most likely cause?

   • AThe switch is configured to flood unknown multicast traffic, which is the default behavior.
   • BThe switch is not configured with a static multicast router port.
   • CThe switch has not yet learned the multicast router port because no IGMP queries have been received.
   • DThe hosts are sending IGMPv1 reports, which the switch cannot interpret.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   What is the primary purpose of IGMP snooping on a Layer 2 switch?

   • ATo reduce multicast flooding by forwarding multicast traffic only to ports that have interested receivers
   • BTo route multicast packets between VLANs
   • CTo encrypt multicast traffic for secure transmission
   • DTo filter multicast traffic based on source IP addresses
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Which IGMP state transition occurs when a router receives a membership report for a group that is not currently in its state table?

   • AThe router creates a new group membership entry and starts the group membership timer.
   • BThe router ignores the report because the group is not in its table.
   • CThe router immediately forwards multicast traffic for that group without any further action.
   • DThe router sends a leave message to the host.
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   Which IGMP version is the first to support source-specific multicast (SSM) with INCLUDE and EXCLUDE filtering?

   • AIGMPv1
   • BIGMPv3
   • CIGMPv2
   • DIGMPv4
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A network engineer is troubleshooting a multicast issue where hosts are not receiving traffic after leaving a group. The router is running IGMPv1. The engineer notices that the group state remains on the router even after all hosts have left. What is the most likely reason?

   • AThe router is configured with a long query response interval.
   • BThe hosts are not sending leave messages because IGMPv1 does not support them.
   • CThe hosts are sending IGMPv2 leave messages, which the router cannot process.
   • DThe router is not sending general queries.
   Reveal Solution Discussion Select an answer first