300-360 Question #80: Real Exam Question with Answer & Explanation

The correct answer is B: enable 40 MHz wide channels. Three changes address multicast video artifacts effectively: (B) Enabling 40 MHz wide channels doubles available spectrum from 20 MHz to 40 MHz, increasing throughput capacity for bandwidth-intensive video streams. (C) Call Admission Control (CAC) prevents the channel from becomi

Question

Clients are experiencing artifacts in multicast video even though the network was recently upgraded to 802.11n APs. What three configuration changes will be most effective to improve performance? (Choose three.)

Options

Aincrease mandatory data rate
Benable 40 MHz wide channels
Cenable Call Admission Control
Dincrease QoS marking on multicast
Eenable VideoStream
Fdisable Multicast Messaging

Explanation

Three changes address multicast video artifacts effectively: (B) Enabling 40 MHz wide channels doubles available spectrum from 20 MHz to 40 MHz, increasing throughput capacity for bandwidth-intensive video streams. (C) Call Admission Control (CAC) prevents the channel from becoming oversubscribed by limiting the number of active streams, ensuring existing video sessions maintain sufficient bandwidth. (E) VideoStream (Cisco's Multicast-to-Unicast conversion) is the most impactful change - it converts multicast video flows to reliable unicast streams per client, eliminating the unreliable nature of 802.11 multicast delivery and allowing per-client retransmissions. Choice A (increasing mandatory data rate) would reduce coverage area and worsen the problem. Choice D (QoS marking) alone does not fix unreliable multicast delivery. Choice F (disabling multicast messaging) breaks the feature entirely.

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