When you identify the various network switches on a network, you eventually need to gain access to those switches to verify various network settings as well as alter and/or test various network settings. Properly logging in to a network switch, using correct credentials, will allow you to view the switch configuration and, potentially, modify the switch configuration.
Go to the DOS command prompt: Click "Start," then click "Run" (for Vista, just click "Start"), type "cmd" into the window that displays and then press "Enter."
Telnet to the IP address of the switch to which you want to connect: type "telnet switch-ip-address" (where "switch-ip-address" is the ip address of your switch); and then press "Enter."
Enter the username setup for your use on the switch at the "Username:" prompt; and then press "Enter."
Enter the password corresponding to your switch user account at the "Password:" prompt; and then press "Enter."