350-401 Question 616
Select 4A network administrator has configured IP SLA to measure jitter and delay across a WAN link. Despite the configuration, users are reporting poor VoIP call quality. Upon inspection, the administrator notices that the IP SLA responder is not reachable, and the tracked object linked to the IP SLA operation is down. Which of the following steps should the administrator take to troubleshoot and resolve the issue?
- A
Verify that the IP SLA responder is enabled on the remote device.
- B
Ensure that the correct IP SLA operation type (e.g., UDP Jitter) is configured for VoIP traffic.
- C
Check if the ACL on the router is blocking IP SLA control packets.
- D
Increase the frequency of the IP SLA operation to improve response times.
- E
Validate the default gateway or routing configuration to ensure connectivity to the responder.
Show answer and explanation
Correct answers: A, B, C, E
Explanation
To troubleshoot IP SLA issues, it is critical to ensure that the responder is enabled, the correct operation type is configured, and there are no network restrictions (e.g., ACLs) blocking the communication. Additionally, basic connectivity between the devices must be validated. By addressing these areas, the network administrator can diagnose and resolve the root cause of the IP SLA failure and improve VoIP call quality.
- A. Correct.
The IP SLA responder must be enabled on the remote device to process the IP SLA requests and provide accurate measurements. Without it, the IP SLA operation will fail.
- B. Correct.
The correct IP SLA operation type (such as UDP Jitter) must be configured to measure VoIP-specific metrics like jitter and delay. Using an incorrect operation type could lead to misleading results.
- C. Correct.
If an ACL is configured on the router, it could inadvertently block IP SLA control packets, preventing the operation from functioning properly.
- D. Incorrect.
Increasing the frequency of the IP SLA operation is not necessarily a solution to this issue. It would not resolve connectivity issues or responder-related problems.
- E. Correct.
If the default gateway or routing configuration is incorrect, the router may not be able to reach the IP SLA responder, causing the operation to fail.