300-425 Question 79
Single answerAn enterprise network administrator is configuring multicast on a WLAN to support a video streaming application. The application requires efficient delivery of multicast traffic to multiple wireless clients while avoiding unnecessary bandwidth usage. Which configuration should the administrator apply to achieve this?
- A
Enable multicast-to-unicast conversion on the wireless LAN controller (WLC).
- B
Disable multicast on the WLAN and rely only on unicast traffic for video streaming.
- C
Configure IGMP Snooping on the wireless LAN controller (WLC).
- D
Enable multicast direct feature and configure a fixed multicast IP address for the WLAN.
Show answer and explanation
Correct answer: A
Explanation
Multicast over WLAN can be inefficient due to the nature of wireless transmission and the need for lower data rates for multicast frames. By enabling multicast-to-unicast conversion, the wireless LAN controller (WLC) converts multicast traffic into individual unicast streams for each client. This approach ensures reliable delivery and avoids the inefficiencies of native multicast over Wi-Fi. Other options, such as disabling multicast or relying on IGMP Snooping, do not address the specific challenges of multicast on WLANs.
- A. Correct.
This is the correct answer. Multicast-to-unicast conversion ensures that multicast traffic sent to wireless clients is converted to unicast packets, reducing packet loss and avoiding unnecessary bandwidth usage in environments where multicast over Wi-Fi is less efficient.
- B. Incorrect.
This is incorrect because disabling multicast entirely would prevent the application from using multicast for video streaming, leading to inefficient use of network resources and higher bandwidth usage due to unicast replication.
- C. Incorrect.
This is incorrect because IGMP Snooping is primarily used to optimize multicast traffic forwarding in wired networks. It does not address the issues of delivering multicast traffic efficiently on a WLAN.
- D. Incorrect.
This is incorrect because enabling multicast direct and configuring a fixed multicast IP address is not necessary for general multicast efficiency; instead, it is used for specific scenarios where multicast needs to be delivered directly to clients without additional processing.