Question:
A network administrator is configuring SSH on a router. When verifying the configuration, the administrator notices that the SSH connection requests fail, but the Telnet connection requests from the same workstation are successful. Which two parts of the router configuration should be checked to try to locate the problem? (Choose two.)
- The transport input command is incorrect on the vty lines.
- An extended ACL that is referencing the port argument for SSH is misconfigured.
- The ip access-class command is missing.
- The password is misconfigured on the console line.
- A standard ACL is possibly blocking the workstation from access to the router.
Explanation: There are several possible configuration issues to account for why SSH connections are failing. Among them are (1) the VTY lines should accept SSH connections by the transport input all or transport input ssh command; and (2) if there is an extended ACL to protect access to the vty lines, the port (either by the word ssh or the numeric number) should be included in the permit ACE. Because Telnet works, the connectivity to the vty line can be established, and thus the option that the standard ACL is blocking the workstation from access to the router does not apply. The option that the ip access-class command is missing does not apply because if the command is missing, no ACL will be applied to filter the access to vty lines. (Although the statement might be true in the router configuration, it is not a reason why SSH is not successful.) Finally the option that the password is misconfigured on the console line does not apply because SSH connects to vty lines, not to the console line.
Exam with this question: CCNP Enterprise: Advanced Routing (Version 8.0) – Infrastructure Security and Management Exam
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