Virtual Teletype (VTY)

Virtual teletype (VTY) is a command line interface (CLI) created in a router and used to facilitate a connection to the daemon via Telnet, a network protocol used in local area networks. To connect to a VTY, users must present a valid password.

The VTY interface has three restricted mode commands:

• VTY View: Enables read-only interface access
• VTY Enable: Enables read-write access to the CLI
• VTY Other: Includes modes like Trivial File Transfer Protocol (TFTP)

VTY uses a set of CLI command actions, which depend on the three types of actions CLI can perform:

• Movement
• Editing
• Advanced