In the same way that you use commands and utilities to verify a host configuration, you use commands to verify the interfaces of intermediary devices. The IOS provides commands to verify the operation of router and switch interfaces.
Verifying the Switch Interfaces
Examining S1 and S2, you use the show ip interface brief command to verify the condition of the switch interfaces, as shown in the figure. The IP address assigned to VLAN 1 interface on S1 is 192.168.10.2. The IP address assigned to VLAN 1 interface on S2 is 192.168.10.3. The physical interfaces F0/1 and F0/2 on S1 are operational, as are the physical interfaces F0/1 and F0/2 on S2.
Practice verification of a VLAN interface by entering commands in the figure.