HPE Campus Access Mobility Expert (HPE7-A07)

Question

Refer to the exhibit.

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A university operates its own city TV station. The IT department deploys a multimedia server so that TV productions can be distributed across the entire campus IP network through multicast communications. To improve bandwidth use, PIM Sparse Mode and IGMP Snooping are enabled.

When wireless users join the multicast groups, every user connected to the same WLAN has poor network performance. Wired users, however, are unaffected. During troubleshooting, the network administrator saves the packet captures shown in the exhibit and determines that all users—including those that did not join the multicast group—receive the same multicast flow at slow speeds.

Which features should the network administrator enable to resolve the issue?

Explanation

Wi-Fi multicast frames are transmitted over the shared radio medium and are received by all stations on the WLAN; the captured multicast frame is using 6 Mb/s, which consumes excessive airtime. Dynamic Multicast Optimization sends multicast traffic as unicast only to group members, preventing nonmembers from receiving the flow. Multicast Transmission Optimization improves the multicast transmission rate, reducing radio airtime consumption. Cisco documents that IGMP snooping limits over-the-air multicast to APs with clients that joined the relevant multicast groups, and that multicast optimization reduces unnecessary multicast transmission on the wireless medium.

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HPE Campus Access Mobility Expert (HPE7-A07)

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