3.1 Implement Multicast Components 300-430 Practice Questions (Page 5)

Questions 21–25

1. 21expert · hard

   A financial firm is deploying a wireless network for a multicast-based trading application. The application uses a single multicast group address, and the network administrator must ensure that only the authorized market data server can send traffic to that group. The wired network uses IGMPv3. The WLC currently has IGMP snooping enabled but is using IGMPv2. What is the most appropriate action to enforce source-specific multicast on the wireless network?

   • AUpgrade the WLC to support IGMPv3 snooping
   • BDisable IGMP snooping and rely on the multicast router to filter
   • CConfigure the WLC to use IGMPv2 for all multicast groups
   • DEnable multicast direct and set the multicast group to a specific unicast source
   Reveal Solution Discussion Select an answer first
2. 22expert · hard

   A university campus has a multicast video service. The WLC is configured with IGMP snooping, but the network team notices that multicast traffic is being forwarded to APs that have no interested clients. The team suspects that the IGMP querier is not functioning correctly. Which of the following is the most likely cause?

   • AThe multicast group address is in the link-local range.
   • BThe multicast router is not sending IGMP queries on the wireless VLAN.
   • CThe APs are not configured to forward IGMP reports to the WLC.
   • DThe WLC is configured as the IGMP querier, but the multicast router is also sending queries.
   Reveal Solution Discussion Select an answer first
4. 23expert · hard

   A company uses multicast for software distribution to thousands of wireless clients. The application uses a single multicast group. The network administrator wants to ensure that only clients that have successfully joined the group receive the data. The WLC has IGMP snooping enabled. However, the administrator is concerned about IGMPv2 vs IGMPv3 behavior. Which consideration is most important?

   • AIGMPv2 clients cannot join the group if the WLC is configured for IGMPv3.
   • BIGMPv2 clients will receive all traffic for the group, while IGMPv3 clients can filter by source.
   • CIGMPv3 clients will not receive traffic if the WLC is configured for IGMPv2.
   • DIGMP snooping does not work with IGMPv3.
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A university lecture hall has 120 Wi-Fi clients, but typically only 15–20 students join a live multicast video stream at any time. The network administrator wants to reduce unnecessary wireless airtime usage while ensuring that the video is delivered reliably to the students who are actively watching. The WLC is already configured for multicast. Which configuration should the administrator apply?

   • AConfigure the WLC to use multicast direct with a high data rate and rely on client-side buffering.
   • BDisable IGMP snooping and enable multicast-to-unicast conversion for all clients.
   • CEnable IGMP snooping on the WLC and configure multicast-to-unicast conversion for the video stream.
   • DEnable multicast direct and set the multicast group to use a fixed low data rate.
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   What is the role of a multicast router in forwarding multicast traffic?

   • AIt floods all multicast packets to every interface except the one on which they arrived.
   • BIt builds a distribution tree and replicates packets only on interfaces that lead toward interested receivers.
   • CIt converts multicast packets to unicast packets and sends them to each receiver individually.
   • DIt stores multicast packets and delivers them only when receivers send a request.
   Reveal Solution Discussion Select an answer first