"Routers have various memory locations where configuration command files are stored (temporarily or permanently), and where the router’s operating system (IOS) is located. This memory is of two types- volatile and non-volatile (volatile means the information is lost when the router is turned off or rebooted). This chapter discusses basic router configuration, including how to configure the router for the first time, configuring from the command-line interface ( CLI), loading and saving configuration files, and working with the filesystems "