Which of the following operations should be performed preferentially for Telnet login failure troubleshooting?

Which of the following operations should be performed preferentially for Telnet login failure troubleshooting?
A . Check whether the client can ping the server.
B . Check whether the number of login users reaches the upper limit.
C . Check whether an ACL is configured in the VTY user interface view.
D . Check whether the access protocol is correctly configured in the VTY user interface view.

View Answer

Answer: A