The AI agrees with the suggested answer of BC.

The question highlights issues with multicast video streaming over a wireless network, specifically a client experiencing problems at a data rate of 12 Mbps. The goal is to identify the necessary actions to ensure reliable multicast video streaming.

Reasoning for choosing option B:
Implementing **video-stream** for the multicast video on the controller is crucial. Wireless networks often struggle with multicast due to the lack of inherent reliability mechanisms (like acknowledgements in unicast). Video-stream feature on the controller can optimize the delivery of multicast video, potentially by adding reliability features or prioritizing the video traffic. This aligns with the need to ensure reliable streaming, which the question emphasizes. Based on Cisco documentation,VideoStream improves the performance of multicast video applications over a wireless LAN (WLAN) network.

Reasoning for choosing option C:
Allowing **multicast-direct** to work correctly and be enabled globally is also necessary. Multicast-direct converts multicast traffic to unicast. In wireless environments, this means the controller sends a separate, unicast stream to each client that has joined the multicast group. While this increases bandwidth consumption, it guarantees delivery to each client because unicast benefits from acknowledgements and retransmissions.

Reasons for not choosing the other options:
* **Option A:** Turning off IGMP snooping is generally not a good idea. IGMP snooping helps the wireless controller efficiently forward multicast traffic only to those clients that have requested it. Disabling it would flood the network with multicast traffic, potentially worsening the problem. Disabling IGMP snooping is not recommended because it causes the AP to forward all multicast traffic to every client, regardless of whether they requested it. * **Option D:** Changing the WLAN QoS value to Bronze is not a targeted solution. While QoS is important, simply setting it to Bronze is an arbitrary setting and doesn't guarantee that multicast video will be prioritized effectively. The appropriate QoS should align with the network's overall QoS policy, but a blanket "Bronze" setting is unlikely to resolve the issue. * **Option E:** While RTSP (Real Time Streaming Protocol) can be used for video streaming, suggesting it as a replacement for wireless multicast because "wireless multicast not using acknowledgements" misses the point. The problem statement says a valid multicast address on the network is being used. The intention is to improve multicast delivery, not to switch to a different streaming method. RTSP itself doesn't inherently solve the reliability problem over wireless and would likely use unicast, which multicast-direct already addresses.

Therefore, options B and C are the most appropriate actions to ensure reliable multicast video streaming in this scenario.

VideoStream, https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/mcast_vstream.html