You would be amazed at how few Cisco routers and switches have their configs backed up to a local TFTP server. I have seen companies go out of business because the router lost its config and the last person to configure it has left the company. Three days later, by the time somebody has worked out all the routes and access lists the customers have all left.

In module 6 you learn how to save your router and switch configs and also how to perform some simple TCP commands on routers as well as how to use Cisco Discovery Protocol or CDP.