300-445 Question 180
Select 4An enterprise network is experiencing delayed application responses, and users report intermittent connectivity issues. The network assurance tool shows high CPU usage on a core router and collected flow data indicates frequent retransmissions. Which of the following actions would help diagnose the root cause of the issue?
- A
Analyze packet captures from the affected router to identify packet retransmission patterns.
- B
Check the routing table on the affected router to detect any suboptimal or looping routes.
- C
Inspect interface counters for signs of congestion or dropped packets on the router.
- D
Reboot the router to clear its CPU and memory usage.
- E
Review Quality of Service (QoS) configurations to ensure priority traffic is not being dropped.
Show answer and explanation
Correct answers: A, B, C, E
Explanation
Diagnosing network issues such as packet loss, congestion, and routing inefficiencies requires analyzing data from packet captures, routing tables, and interface counters. QoS configurations should also be reviewed to ensure traffic prioritization is functioning as intended. Rebooting the router does not provide insight into the root cause and is not considered a diagnostic step.
- A. Correct.
Packet captures can provide granular data on retransmissions and help identify patterns, such as excessive packet loss or out-of-order packets, which could contribute to the issue.
- B. Correct.
Checking the routing table can reveal routing loops or suboptimal paths, which may cause increased CPU usage and network performance degradation.
- C. Correct.
Inspecting interface counters can point to congestion or dropped packets, which are critical metrics for diagnosing network performance issues.
- D. Incorrect.
Rebooting the router is not a diagnostic action. This may temporarily resolve the symptom but does not address the root cause of the issue.
- E. Correct.
Reviewing QoS configurations is crucial to ensure high-priority traffic is treated appropriately and not being inadvertently dropped, which could contribute to the issue.