When a Huawei router serves as an SSH client and fails to log in to another Huawei router, which of the following is the least likely cause for the server fault?

When a Huawei router serves as an SSH client and fails to log in to another Huawei router, which of the following is the least likely cause for the server fault?

• A. The SSH protocol is not bound in the VTY user interface view
• B. The user service type, authentication type, and user service type are not configured
• C. The SSH server and client have inconsistent versions
• D. The SSH first-time authentication function is disabled

Answer: (D)

The least likely cause for the server fault when a Huawei router serving as an SSH client fails to log in to another Huawei router is that the SSH first-time authentication function is disabled. In SSH communications, the first-time authentication function primarily serves as a security feature that prompts the user to verify the authenticity of the server's identity when connecting for the first time. While disabling this feature may affect the user experience or present a warning, it would not typically prevent an SSH login outright. On the other hand, binding the SSH protocol in the VTY user interface view, misconfigurations related to user service types and authentication types, and version inconsistencies between the SSH server and client can all hinder successful SSH logins. These factors directly impact the functionality and establishment of the SSH session, making them more likely causes of a failure to log in.

The least likely cause for the server fault when a Huawei router serving as an SSH client fails to log in to another Huawei router is that the SSH first-time authentication function is disabled. In SSH communications, the first-time authentication function primarily serves as a security feature that prompts the user to verify the authenticity of the server's identity when connecting for the first time. While disabling this feature may affect the user experience or present a warning, it would not typically prevent an SSH login outright.

On the other hand, binding the SSH protocol in the VTY user interface view, misconfigurations related to user service types and authentication types, and version inconsistencies between the SSH server and client can all hinder successful SSH logins. These factors directly impact the functionality and establishment of the SSH session, making them more likely causes of a failure to log in.