What do the 2 numbers mean ex: "line vty 0 4"

Jon1992

https://i.imgur.com/ONZmRVx.png The number on the left is the router or switch right whats the one on the right mean. is there a command to show all lines? on the device?

kaiju

Virtual terminal lines 0 thru 4 can be accessed via the configured login and password. The command "show line" will show all of the lines (cty, tty, aux, and vty).

albinorhino187

To expand on kaiju's answer, when you telnet or ssh to a device, you're accessing it via a vty line. So you connect on vty 0, and then I access it on 1, another person on 2, 3, 4... So it can support 5 connections at once. Most of the time, you're applying the same configuration, ACLs, or whatever, to all vty lines, so you see it written as "line vty 0 4", but there's technically nothing stopping you from applying one configuration to say lines 0-2, and then a different config for lines 3 and 4.