Understanding TCP/IP

A.5 Commands

We can find out which commands we are allowed to be used in the IOS system by using ?.

For example, a question mark entered on the command line in non-privileged mode:

Router>?
Exec commands:
access-enable Create a temporary Access-List entry
access-profile Apply user-profile to interface
clear Reset functions
connect Open a terminal connection
disable Turn off privileged commands
disconnect Disconnect an existing network connection
enable Turn on privileged commands
exit Exit from the EXEC
help Description of the interactive help system
lock Lock the terminal
login Log in as a particular user
logout Exit from the EXEC
—More—

The question mark command can also be used to obtain a list of commands that begin with a particular character ...