This command is used to create shortcuts to various commands. While it is definately handy in the real world, we would not recommend using alias execwhile studying for the CCNA, as you could potentially get more used to your own commands instead of Cisco’s commands.
Router(config)#alias exec <alias> <real command>
In this example, we will set quick aliases to some of my favorite commands.
2611XM(config)#alias exec s sho ip int brief