What layer of the OSI model would you assume the problem is in if you type
show interface serial 1 and receive the following message?
"Serial1 is down, line protocol is down."
A. Physical layer
B. Data Link layer
C. Network layer
D. None. It is a router problem.
Answer: Option A
Solution(By Examveda Team)If you see that a serial interface and the protocol are both down, then you have a Physical layer problem. If you see
serial1 is up,
line protocol is down, then you are not receiving (Data Link) keepalives from the remote end.
enable secret password Cisco
enable secret cisco
enable secret Cisco
enable password Cisco
You set the console password, but when you display the configuration, the password doesn't show up; it looks like this:
Line console 0
Exec-timeout 1 44
exec-timeout 1 35
A. If no command has been typed in 35 seconds, the console connection will be closed.
B. If no router activity has been detected in 1 hour and 35 minutes, the console will be locked out.
C. If no commands have been typed in 1 minute and 35 seconds, the console connection will be closed.
D. If you're connected to the router by a Telnet connection, input must be detected within 1 minute and 35 seconds or the connection will be closed.
sh int s0
sh int serial 0
show controllers serial 0
show serial 0 controllers