300-445 Question 179
Select 3A network operations team notices increased latency and jitter in VoIP calls during business hours. They suspect congestion as the root cause. Which of the following diagnostic approaches would help identify the root cause of the issue?
- A
Analyze NetFlow data to identify high-bandwidth applications consuming network resources during business hours.
- B
Perform a traceroute to determine changes in network hop latency during the affected period.
- C
Review QoS policies to ensure proper prioritization of VoIP traffic.
- D
Capture packet traces at edge routers to identify packet retransmissions.
- E
Reconfigure the routing protocol to prioritize VoIP traffic.
Show answer and explanation
Correct answers: A, B, C
Explanation
Congestion issues affecting VoIP traffic can be diagnosed by identifying high-bandwidth applications consuming network resources (NetFlow), determining latency patterns (traceroute), and validating that QoS configurations are prioritizing VoIP traffic. These methods collectively provide insight into possible causes of jitter and latency. Packet captures and routing protocol changes are not the most direct or appropriate approaches for diagnosing congestion in this scenario.
- A. Correct.
Analyzing NetFlow data can reveal which applications or endpoints are consuming excessive bandwidth, potentially causing congestion and impacting VoIP performance.
- B. Correct.
Performing a traceroute can help identify specific network segments or devices where latency increases, helping pinpoint congestion points.
- C. Correct.
Reviewing QoS policies is critical to ensure VoIP traffic is being prioritized effectively, as incorrect or missing QoS configurations can lead to jitter and latency issues.
- D. Incorrect.
While capturing packet traces can provide detailed information, it is more useful for diagnosing packet loss or retransmissions rather than directly identifying congestion-related issues.
- E. Incorrect.
Reconfiguring the routing protocol without understanding the root cause could lead to unintended consequences and is not a diagnostic approach.