Network devices form the core of networking. In this chapter, you'll learn about all of the network devices available in Packet Tracer and the modules used by it. So, after you are done customizing a device with your preferred modules, wouldn't it be nice to save them so that the device is available for use the next time? Don't know Cisco Internetwork Operating System (IOS) commands? After reading the Configuring network device section, you'll be on your feet configuring Cisco routers and switches without using any commands.