3.1 Implement Multicast Components 300-430 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A university is deploying a wireless network for a lecture hall where professors stream live video to student laptops. The video is sent as multicast to a group that typically has 20–30 active receivers. The WLC is configured for multicast direct. Students report that video playback is choppy and frequently freezes. The wired network is healthy and the multicast source is sending correctly. Which configuration change would most directly improve the wireless multicast experience?

   • AEnable IGMP snooping on the WLC and access points
   • BDisable IGMP snooping so all APs flood multicast to all clients
   • CIncrease the multicast data rate to the highest supported MCS index
   • DConfigure multicast-to-unicast conversion for the video group
   Reveal Solution Discussion Select an answer first
2. 17expert · hard

   A hospital is deploying a wireless network for a telemedicine application that sends multicast video from a doctor's workstation to a group of nurses' tablets. The application requires reliable delivery and low latency. The number of nurses per session is typically 5–10. The network administrator is considering multicast-to-unicast conversion versus multicast direct. Which statement correctly compares the two approaches for this scenario?

   • AMulticast-to-unicast provides reliable delivery but increases airtime usage; multicast direct uses less airtime but lacks reliability
   • BMulticast-to-unicast uses less airtime than multicast direct for any group size
   • CMulticast direct provides reliable delivery because it uses a higher data rate; multicast-to-unicast is less reliable because it uses a lower data rate
   • DMulticast direct and multicast-to-unicast both provide the same reliability because they both use acknowledgments
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

   Which statement best describes how multicast traffic is replicated in a wired network?

   • AThe first router that receives a multicast packet broadcasts it to all other routers in the network.
   • BOnly the last-hop router replicates the packet to all hosts on the subnet, regardless of group membership.
   • CEach router along the distribution tree replicates the packet onto each interface that leads to a downstream receiver.
   • DThe source sends a separate copy of each packet to every receiver using unicast encapsulation.
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5. 19foundation · easy

   What is a key difference between IGMPv2 and IGMPv3?

   • AIGMPv3 uses a different multicast IP address range than IGMPv2.
   • BIGMPv3 eliminates the need for multicast routers on the LAN.
   • CIGMPv3 requires the use of PIM-SM, while IGMPv2 only works with PIM-DM.
   • DIGMPv3 allows hosts to specify which sources they want to receive from, while IGMPv2 only allows joining a group without source filtering.
   Reveal Solution Discussion Select an answer first
6. 20application · medium

   A financial trading firm uses a multicast feed for real-time market data. The application requires that clients receive data only from a specific source server to prevent spoofed data injection. The wireless network uses IGMP snooping on the WLC. Which IGMP version should the administrator ensure the clients and the WLC support?

   • AIGMPv4
   • BIGMPv2
   • CIGMPv3
   • DIGMPv1
   Reveal Solution Discussion Select an answer first