300-425 Question 61
Single answerAn enterprise network is configured to support multicast traffic for a video streaming application across multiple subnets. The network administrator notices that multicast traffic is being flooded to all clients, even those that are not subscribed to the stream. Which of the following configurations should be implemented on the Cisco wireless infrastructure to ensure that only subscribers receive the multicast stream?
- A
Enable IGMP Snooping on the wireless LAN controller (WLC).
- B
Enable Multicast-to-Unicast conversion on the wireless LAN controller (WLC).
- C
Configure a static multicast group for the video stream on all access points.
- D
Disable multicast routing on the wireless LAN controller (WLC).
Show answer and explanation
Correct answer: A
Explanation
The issue arises because multicast traffic is being flooded to all clients, regardless of whether they are subscribed to the multicast group. IGMP Snooping allows the wireless LAN controller to listen to IGMP messages between clients and multicast routers, ensuring that multicast traffic is only forwarded to the clients that have explicitly joined the multicast group. This reduces unnecessary traffic and optimizes network performance.
- A. Correct.
Enabling IGMP Snooping ensures that multicast traffic is only forwarded to clients that have subscribed to the multicast group, preventing unnecessary flooding. This is the correct configuration in this scenario.
- B. Incorrect.
Multicast-to-Unicast conversion is used to convert multicast packets into unicast packets for better reliability over wireless networks, but it does not prevent multicast traffic from being flooded to all clients.
- C. Incorrect.
Configuring a static multicast group on all access points does not dynamically manage multicast group memberships and would not resolve the flooding issue.
- D. Incorrect.
Disabling multicast routing would stop all multicast traffic from being forwarded, which is not a viable solution in this case as it would break the video streaming application.