300-445 Question 119
Select 3An enterprise network's video conferencing application is experiencing poor performance. Users report issues such as delayed audio, video freezing, and overall degraded quality. As a network engineer, you are tasked with diagnosing the issue. Which combination of network characteristics should you prioritize investigating to address the problem effectively?
- A
High levels of jitter
- B
Packet loss rate
- C
TCP retransmission rate
- D
Latency between endpoints
- E
DNS resolution time
Show answer and explanation
Correct answers: A, B, D
Explanation
Video conferencing relies heavily on real-time packet delivery, making jitter, packet loss, and latency critical factors to investigate. Jitter disrupts the timing of packet arrival, packet loss affects the completeness of the stream, and latency causes delays in communication. DNS resolution time and TCP retransmission rate, while important in other contexts, are less relevant in diagnosing video conferencing performance issues.
- A. Correct.
High levels of jitter can cause inconsistencies in packet delivery, leading to issues like delayed or out-of-sync audio and video, which directly impacts real-time applications like video conferencing.
- B. Correct.
Packet loss rate is critical to investigate because lost packets can disrupt the continuity of audio and video streams, leading to freezing or degraded quality.
- C. Incorrect.
TCP retransmission rate is less relevant for video conferencing applications, which often use UDP for its low-latency benefits. High retransmissions are more indicative of TCP-based performance issues.
- D. Correct.
Latency between endpoints is crucial for real-time applications. High latency can lead to noticeable delays in communication, degrading the user experience.
- E. Incorrect.
DNS resolution time is unrelated to the performance of ongoing video conferencing sessions. It typically affects the initial connection or session setup but not the quality of an established stream.