Appendix B Common Services
GS2200-24/24P User’s Guide
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TELNET TCP 23 Telnet is the login and terminal 
emulation protocol common on the 
Internet and in UNIX environments. It 
operates over TCP/IP networks. Its 
primary function is to allow users to 
log into remote host systems.
TFTP UDP 69 Trivial File Transfer Protocol is an 
Internet file transfer protocol similar 
to FTP, but uses the UDP (User 
Datagram Protocol) rather than TCP 
(Transmission Control Protocol).
VDOLIVE TCP 7000 Another videoconferencing solution.
Table 116   Commonly Used Services (continued)
NAME PROTOCOL PORT(S) DESCRIPTION