300-430 Question 69
Single answerA network engineer is configuring a Cisco wireless network to support multicast traffic for video streaming. The engineer needs to ensure efficient delivery of multicast traffic to wireless clients while minimizing unnecessary wireless resource utilization. Which configuration step is essential to implement multicast traffic correctly on the wireless network?
- A
Enable IGMP snooping on the wireless LAN controller (WLC).
- B
Configure Multicast-to-Unicast mode on the wireless LAN controller (WLC).
- C
Enable PIM Sparse Mode on the core switch.
- D
Enable Dynamic Frequency Selection (DFS) on the wireless network.
Show answer and explanation
Correct answer: B
Explanation
In wireless networks, multicast traffic is typically broadcasted to all clients, which can lead to inefficient resource usage and reduced reliability. Configuring Multicast-to-Unicast mode on the wireless LAN controller ensures that multicast traffic is converted into unicast packets for each wireless client. This approach prevents unnecessary broadcast traffic and ensures reliable delivery of multicast streams, such as video, to wireless users.
- A. Incorrect.
While IGMP snooping helps manage multicast group memberships at the Layer 2 level, it does not address the specific challenges of delivering multicast traffic efficiently to wireless clients. IGMP snooping is not sufficient for the wireless multicast optimization required in this scenario.
- B. Correct.
Multicast-to-Unicast mode converts multicast packets into unicast packets for each wireless client. This approach ensures reliable delivery of multicast traffic to wireless clients and prevents multicast traffic from being broadcasted inefficiently across the wireless medium.
- C. Incorrect.
PIM Sparse Mode is a routing protocol used for multicast distribution across the wired network. While it is critical for wired multicast routing, it does not directly address the wireless-specific requirements for efficient delivery of multicast traffic.
- D. Incorrect.
Dynamic Frequency Selection (DFS) is used to avoid interference with radar systems on certain wireless channels. It is unrelated to the configuration of multicast traffic on the wireless network.