E-Lab 2.2.6a - Keyboard Help in the CLI
In this lab, you will learn the help system in the Cisco IOS.
The Cisco IOS has an interactive help system that will display all possible commands and parameters in each mode.
Entering the ? symbol anytime, anywhere will display the current possible usage options.
The ^ symbol displays the first location where invalid input has occurred. 
There are also hidden commands that are available but are not shown in the help.
Step 1
Enter a ? to view a list of available commands in privileged EXEC mode.
One of the most important and useful commands in the Cisco IOS is the show command.
It is used to display a snapshot of the router's status.
Check the available variations of the show command. Enter a ? after the command show.
Currently, the most widely used routed protocol is the Internet Protocol (IP).
Enter the command to view the available options for the IP Protocol.
Routers build routing tables of IP network addresses to determine the best path to send data.
Now that you have seen the possible IP options, enter the show ip route command to display the routers IP routing table.