One of the most commonly used commands on a switch or router is:

Switch# show version

This command displays information about the currently loaded IOS version, along with hardware and device information. If you are logged into a router or switch remotely, the show version command is an excellent means of quickly finding useful summary information about the particular device to which you are connected. Some of the information points shown from this command are:

Figure 1 displays the output for a Cisco 1941 ISR, while Figure 2 displays the output for a Cisco 2960 Catalyst switch.