300-430 Question 71
Single answerAn enterprise wireless network administrator is troubleshooting video streaming issues on a wireless network. The network uses multicast to deliver video streams to multiple clients. The administrator observes that the video quality is poor and suspects multicast traffic is causing issues. What could be a reason for this behavior?
- A
Multicast traffic is transmitted at the lowest mandatory data rate, which can reduce overall network performance.
- B
Multicast traffic is transmitted using unicast packets, which increases latency.
- C
Multicast streams require all access points to operate on the same channel, causing co-channel interference.
- D
Multicast traffic bypasses Quality of Service (QoS) settings, leading to poor prioritization of video streams.
Show answer and explanation
Correct answer: A
Explanation
Multicast traffic on wireless networks is typically sent at the lowest mandatory data rate to ensure that all clients, even those at the edge of the coverage area, can receive it. However, this can lead to poor network performance and degraded video quality, as the low data rate increases airtime usage and reduces efficiency. Proper configuration of multicast optimization features, such as IGMP snooping or multicast-to-unicast conversion, can help mitigate these issues.
- A. Correct.
This is correct because multicast traffic in a wireless network is often transmitted at the lowest mandatory data rate to ensure compatibility with all clients, which can negatively impact performance and video quality.
- B. Incorrect.
This is incorrect because multicast traffic is not encapsulated into unicast packets unless multicast-to-unicast conversion is explicitly configured, which is not mentioned in the scenario.
- C. Incorrect.
This is incorrect because multicast traffic does not require all access points to operate on the same channel. However, improper channel planning can cause interference.
- D. Incorrect.
This is incorrect because wireless networks can apply QoS to multicast traffic if properly configured. The scenario does not suggest an issue with QoS settings.