300-425 Question 73
Select 3An enterprise wireless network administrator notices degraded performance on a high-density Wi-Fi network when multicast traffic is used for video streaming applications. Which of the following actions can help mitigate the impact of multicast on the wireless network?
- A
Enable IGMP snooping on the wired network to reduce unnecessary multicast traffic.
- B
Use multicast-to-unicast conversion on the wireless controller.
- C
Increase the data rate for multicast traffic to reduce airtime usage.
- D
Disable the use of Dynamic Rate Shifting (DRS) for multicast traffic.
- E
Configure QoS policies to prioritize multicast traffic over unicast traffic.
Show answer and explanation
Correct answers: A, B, C
Explanation
Multicast traffic can adversely affect wireless networks due to its reliance on lower data rates and lack of acknowledgment mechanisms. Enabling IGMP snooping, using multicast-to-unicast conversion, and increasing the multicast data rate are effective strategies to minimize the impact of multicast traffic on Wi-Fi performance. These measures help ensure that multicast traffic does not unnecessarily consume excessive airtime or degrade the experience for other users on the network.
- A. Correct.
Enabling IGMP snooping on the wired network helps reduce unnecessary multicast traffic reaching the access points, as it ensures multicast streams are only sent to the relevant devices.
- B. Correct.
Multicast-to-unicast conversion allows multicast traffic to be sent as unicast frames to clients, enabling better throughput and avoiding the limitations of low multicast data rates.
- C. Correct.
Increasing the data rate for multicast traffic forces clients to receive multicast frames at a higher rate, reducing the time spent transmitting these frames over the air, thereby improving overall network performance.
- D. Incorrect.
Disabling Dynamic Rate Shifting (DRS) for multicast traffic is not recommended as it can lead to inefficient use of the wireless medium, especially in environments with varying signal strengths.
- E. Incorrect.
While QoS can prioritize traffic types, prioritizing multicast over unicast traffic may still not resolve the inherent inefficiencies associated with multicast traffic on Wi-Fi networks.