A network administrator notices that users are reporting poor audio quality during VoIP calls. The administrator suspects that jitter might be causing this issue. What should be done first to confirm if jitter is indeed the problem?
Use a protocol analyzer to measure the jitter values in the network traffic.
Monitor interface counters on network devices for errors and collision rates.
Replace all ethernet cables connected to VoIP devices with new ones.
Check the configuration and policies of Quality of Service (QoS) on the routers.
To confirm if jitter is the problem, the administrator should analyze network traffic using a protocol analyzer to measure jitter values. This approach directly assesses the jitter on the network, which is crucial for understanding the impact on real-time traffic such as VoIP. Monitoring interface counters might help in identifying other issues like packet loss or errors but do not specifically measure jitter. Checking the configuration of QoS is a step taken if excessive jitter is confirmed, to manage priority and ensure quality for voice traffic. Replacing ethernet cables would be an unlikely first step without specific evidence of physical layer issues causing jitter.
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What is jitter, and how does it affect VoIP calls?
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What is Quality of Service (QoS) and how does it relate to VoIP?