virtual teletype
Abbreviated as VTY, virtual teletype is a command line interface that enables users to connect to the daemon using the Telnet protocol. To connect to a VTY users must setup and use a VTY password. VTY offers three user modes including the following;
VTY View Mode for read-only interaction.
VTY Enable Mode for read-write interaction.
VTY Other Mode which are special modes, like TFTP.
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