300-425 Question 86
Single answerA network engineer is tasked with implementing Multicast Direct in a Cisco enterprise wireless network to optimize video streaming for a large number of clients. The engineer needs to configure the wireless LAN controller (WLC) to ensure that multicast traffic is efficiently delivered directly from the access point to clients, bypassing unnecessary replication on the wired network. Which configuration step is critical for enabling Multicast Direct on the WLC?
- A
Enable Multicast-Multicast mode on the WLC and configure the multicast group address.
- B
Ensure IGMP Snooping is enabled on the WLC and the wired network.
- C
Enable the Multicast Direct feature on the WLAN and configure the delivery mode as 'Unicast'.
- D
Enable the Multicast Direct feature on the WLAN and configure the delivery mode as 'Multicast'.
Show answer and explanation
Correct answer: D
Explanation
Multicast Direct is a feature designed to optimize the delivery of multicast traffic, such as video streams, in a wireless network by bypassing the wired network's multicast replication process. Enabling this feature on the WLAN and configuring the delivery mode as 'Multicast' ensures that the access points deliver multicast traffic directly to clients, which is the intended behavior of Multicast Direct.
- A. Incorrect.
Enabling Multicast-Multicast mode and configuring a multicast group address is a valid step for general multicast configurations, but it does not apply specifically to Multicast Direct, as Multicast Direct operates differently by streaming directly to clients.
- B. Incorrect.
IGMP Snooping is typically used to manage multicast traffic on Layer 2 networks, but it is not a critical step for enabling Multicast Direct on the WLC.
- C. Incorrect.
Configuring the delivery mode as 'Unicast' is not applicable for Multicast Direct, as this feature is designed for multicast traffic, not unicast traffic.
- D. Correct.
Enabling the Multicast Direct feature on the WLAN and configuring the delivery mode as 'Multicast' is the correct step, as this ensures multicast traffic is sent directly from the access point to clients, optimizing network efficiency.