300-425 Question 75
Select 3A network engineer is configuring an enterprise wireless network to support multicast traffic for video streaming applications. The engineer notices that multicast traffic is negatively impacting the performance of the wireless network. Which of the following are potential reasons for this performance degradation?
- A
Multicast packets are transmitted at the lowest mandatory data rate configured on the wireless network.
- B
Multicast traffic bypasses encryption mechanisms, leading to increased packet loss.
- C
Wireless clients connected to the same access point must process multicast traffic even if they are not subscribed to the multicast group.
- D
Multicast traffic is sent as unicast frames to each client, increasing overall wireless channel utilization.
- E
Multicast traffic does not use acknowledgment (ACK) mechanisms, which can lead to retransmissions and inefficiencies.
Show answer and explanation
Correct answers: A, C, E
Explanation
Multicast traffic in wireless networks is handled differently compared to unicast traffic, often leading to performance challenges. By default, multicast traffic is sent at the lowest mandatory data rate, impacting throughput, and does not use acknowledgment mechanisms, which can result in increased packet loss and inefficiencies. Additionally, multicast frames are processed by all clients on the same access point, even if they are not part of the multicast group, leading to unnecessary overhead. Understanding these behaviors is critical for optimizing wireless network performance in environments utilizing multicast traffic.
- A. Correct.
Correct. By default, multicast traffic in wireless networks is transmitted at the lowest mandatory data rate, which can significantly reduce overall network performance, especially in high-density environments.
- B. Incorrect.
Incorrect. Multicast traffic does not inherently bypass encryption. Encryption depends on the wireless security configuration in use, such as WPA2 or WPA3.
- C. Correct.
Correct. Wireless clients connected to the same access point process multicast traffic even if they do not subscribe to the multicast group, which can lead to wasted resources and unnecessary processing.
- D. Incorrect.
Incorrect. Multicast traffic is not sent as unicast frames by default. However, some configurations (e.g., multicast-to-unicast conversion) might explicitly change this behavior.
- E. Correct.
Correct. Multicast traffic does not use the acknowledgment (ACK) mechanism in wireless networks, which can result in packet loss and inefficiencies, particularly in environments with interference or poor signal quality.