Here are some of the most commonly used IOS commands to display and verify the operational status of the router and related network functionality. These commands are divided into several categories.

Routing Related:

Interface Related:

Other connectivity related commands include the show cdp neighbors command (Figure 8). This command displays information on directly connected devices including Device ID, the local interface the device is connected to, capability (R = router, S = switch), the platform, and Port ID of the remote device. The details option includes IP addressing information and the IOS version.

Use the Syntax Checker in Figure 9 to verify router configurations using these show commands.