300-445 Question 136
Select 3An enterprise network has implemented a VoIP solution to support internal communications. Users are reporting intermittent issues with poor voice quality, including delays and jitter during calls. As part of the network assurance process, which steps should you take to identify and resolve the issue?
- A
Verify QoS policies are correctly applied to prioritize voice traffic over less critical traffic.
- B
Conduct a packet capture on the VoIP traffic to analyze packet loss and jitter levels.
- C
Increase the bandwidth of all uplinks to ensure sufficient capacity for voice traffic.
- D
Check the configuration of the network devices for any misconfigurations in voice VLANs.
- E
Disable any existing QoS policies to test whether they are causing the issue.
Show answer and explanation
Correct answers: A, B, D
Explanation
To address issues with VoIP quality, it is critical to analyze and optimize the network's handling of voice traffic, starting with QoS policies, packet analysis, and network configuration. QoS ensures prioritization, packet captures provide diagnostic data, and verifying VLAN configurations ensures proper voice traffic segregation. Increasing bandwidth or disabling QoS are not appropriate initial steps without identifying the root cause.
- A. Correct.
Verifying QoS policies is essential as QoS ensures voice traffic is prioritized over other types of traffic, reducing issues like jitter and delay.
- B. Correct.
A packet capture can provide insights into the network conditions affecting VoIP traffic, such as packet loss or jitter, which are common causes of poor voice quality.
- C. Incorrect.
Increasing bandwidth is not the first step, as the issue may not be related to capacity but rather to prioritization or configuration. This is a reactive approach without diagnosing root causes.
- D. Correct.
Misconfigurations in VLANs could lead to voice traffic being improperly tagged or routed, contributing to the issues reported.
- E. Incorrect.
Disabling QoS policies is not recommended, as this could exacerbate the problem by deprioritizing voice traffic further.