300-430 Question 89
Select 2An enterprise network administrator is deploying Multicast Direct on a Cisco Wireless LAN Controller (WLC) to optimize video streaming performance for wireless clients. What must the administrator ensure to correctly implement Multicast Direct?
- A
Enable multicast-multicast mode on the WLC.
- B
Ensure IGMP snooping is enabled on the WLC.
- C
Configure the WLC to use unicast mode for multicast traffic.
- D
Enable the 'Multicast Direct' option in the WLAN settings.
- E
Verify that the APs support IGMPv3 for Multicast Direct.
Show answer and explanation
Correct answers: B, D
Explanation
To implement Multicast Direct, IGMP snooping must be enabled to manage multicast group memberships, and the 'Multicast Direct' option must be activated in the WLAN settings. This ensures that multicast traffic is delivered directly to wireless clients, reducing network overhead and improving performance. Other settings, such as multicast-multicast mode or unicast mode for multicast traffic, are not required for Multicast Direct.
- A. Incorrect.
This is incorrect. Multicast-multicast mode is not required for Multicast Direct. Instead, Multicast Direct operates by delivering multicast traffic directly from the AP to the client once the client subscribes.
- B. Correct.
This is correct. IGMP snooping must be enabled to ensure proper handling of multicast group memberships, which is critical for Multicast Direct to function effectively.
- C. Incorrect.
This is incorrect. Unicast mode for multicast traffic is used when multicast is not supported end-to-end. Multicast Direct specifically relies on multicast delivery.
- D. Correct.
This is correct. The 'Multicast Direct' option must be explicitly enabled in the WLAN settings to allow the AP to deliver multicast traffic directly to the clients.
- E. Incorrect.
This is incorrect. While APs must support multicast, IGMPv3 is not a strict requirement for Multicast Direct. Older versions of IGMP may suffice depending on the use case.