Which of the following commands sets the secret password to Cisco?

You type the following command into the router and receive the following output:
Router#show serial 0/0
% Invalid input detected at '^' marker.
Why was this error message displayed?

Which of the following commands will display the current IP addressing and the layer 1 and 2 status of an interface?
1. show version
2. show protocols
3. show interfaces
4. show controllers
5. show ip interface

You type show running-config and get this output:
[output cut]
Line console 0
    Exec-timeout 1 35
    Password BIXPASSWD
[output cut]

What do the two numbers following the exec-timeout command mean?

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."