100-150 Question 239
Select 3A network administrator is troubleshooting an issue where they cannot remotely manage a switch in a branch office using SSH. The administrator has verified that the device is online and reachable by ping. Which of the following steps should the administrator perform to resolve the issue?
- A
Verify that the SSH service is enabled on the switch.
- B
Check if the correct port (22) is open on the switch.
- C
Ensure that the VPN connection between the branch office and the administrator's location is active.
- D
Test connectivity using Telnet instead of SSH.
- E
Check that the network management system (NMS) is configured to monitor the switch.
Show answer and explanation
Correct answers: A, B, C
Explanation
To troubleshoot SSH access issues, the administrator should ensure that SSH is enabled on the switch, verify that the SSH port (22) is open, and confirm that the secure VPN connection between locations is active. These steps focus on resolving potential configuration or connectivity issues that directly impact SSH functionality. Testing with Telnet and reviewing NMS configurations do not address the root cause of the SSH problem in this scenario.
- A. Correct.
Verifying that the SSH service is enabled on the switch is critical, as SSH must be explicitly configured and enabled on network devices for remote access.
- B. Correct.
Checking if port 22 is open is necessary because SSH communication uses this port, and if it is blocked by a firewall or misconfiguration, SSH access will fail.
- C. Correct.
Ensuring that the VPN connection is active is important because if the VPN is down, the administrator might lose secure access to the branch office network.
- D. Incorrect.
Testing connectivity using Telnet is not recommended because Telnet is unsecure and should not be used in production environments where SSH is unavailable.
- E. Incorrect.
Checking the NMS configuration is unrelated to resolving the SSH issue as it pertains to monitoring the switch's operational status rather than enabling remote management.