100-140 Question 39
Select 4A network administrator recently applied a configuration change to a router's interface to enable a new routing protocol. After the change, users report intermittent connectivity issues. As a support technician, which of the following steps should you take to observe the results of the configuration change and diagnose the issue?
- A
Check the router's interface status using the 'show ip interface' command.
- B
Monitor the routing table with the 'show ip route' command to verify route updates.
- C
Revert the configuration change without investigating further.
- D
Use the 'ping' command to test connectivity to multiple devices on the network.
- E
Analyze the interface logs for errors or warnings using the 'show logging' command.
Show answer and explanation
Correct answers: A, B, D, E
Explanation
To effectively observe the results of configuration changes and diagnose connectivity issues, it is important to gather information from multiple tools and commands. Checking the interface status, monitoring the routing table, testing connectivity with 'ping', and analyzing logs provide a comprehensive approach to identifying and resolving the issue. Reverting the changes without investigating further misses an opportunity to learn and address the root cause of the problem.
- A. Correct.
The 'show ip interface' command helps verify the operational status of the interface, such as whether it is up or down, and checks for issues like IP misconfiguration or administrative shutdown.
- B. Correct.
The 'show ip route' command displays the router's routing table, which is critical for verifying if the new routing protocol has correctly populated routes.
- C. Incorrect.
Reverting the configuration change without further investigation does not address the root cause of the issue and is not a best practice for troubleshooting.
- D. Correct.
The 'ping' command allows you to test connectivity to devices across the network, helping identify whether the issue is localized or widespread.
- E. Correct.
The 'show logging' command provides interface-specific logs, which can reveal errors or warnings related to the configuration change, such as protocol mismatches or link failures.