300-425 Question 76
Single answerAn enterprise network administrator is tasked with configuring multicast on a WLAN to support a video streaming application. The application requires efficient delivery of multicast traffic to wireless clients without causing excessive overhead on the wireless network. Which configuration should the administrator implement on the WLAN to achieve this?
- A
Enable multicast-to-unicast conversion on the WLAN
- B
Enable IGMP Snooping on the WLAN
- C
Configure the WLAN to use a multicast group address and enable the multicast-direct feature
- D
Disable multicast on the WLAN and rely on broadcast forwarding instead
Show answer and explanation
Correct answer: C
Explanation
To implement multicast on a WLAN effectively, the multicast-direct feature should be enabled. This feature allows clients to join a multicast group directly, ensuring efficient delivery of multicast streams without unnecessary overhead. Other options, such as multicast-to-unicast conversion, might work but are less efficient in scenarios requiring true multicast delivery. Disabling multicast or relying on broadcasts should be avoided as they degrade network performance.
- A. Incorrect.
Multicast-to-unicast conversion is useful for certain scenarios, but it increases overhead since each client receives a separate unicast stream, which is less efficient for scenarios requiring true multicast delivery.
- B. Incorrect.
IGMP Snooping is primarily a wired network configuration and does not directly control multicast behavior on a WLAN. It helps manage multicast traffic on switches.
- C. Correct.
Configuring the WLAN to use a multicast group address and enabling the multicast-direct feature ensures efficient delivery of multicast traffic to wireless clients, as it allows clients to directly join the multicast group and avoids unnecessary overhead.
- D. Incorrect.
Disabling multicast and relying on broadcast forwarding is inefficient and increases unnecessary traffic, as broadcasts consume more bandwidth and cause excessive overhead on the WLAN.