CLI Reference Guide-R04

Glossary
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TCP/IP Transmission Control Protocol/Internet Protocol. Protocol suite that includes TCP as the
primary transport protocol, and IP as the network layer protocol.
Telnet Defines a remote communication facility for interfacing to a terminal device over TCP/IP.
TFTP Trivial File Transfer Protocol. A TCP/IP protocol commonly used for software downloads.
UDP User Datagram Protocol. UDP provides a datagram mode for packet-switched
communications. It uses IP as the underlying transport mechanism to provide access to IP-
like services. UDP packets are delivered just like IP packets – connection-less datagrams that
may be discarded before reaching their targets. UDP is useful when TCP would be too
complex, too slow, or just unnecessary.
UTC Universal Time Coordinate. UTC is a time scale that couples Greenwich Mean Time (based
solely on the Earth’s rotation rate) with highly accurate atomic time. The UTC does not have
daylight saving time.
VLAN Virtual LAN. A Virtual LAN is a collection of network nodes that share the same collision
domain regardless of their physical location or connection point in the network. A VLAN
serves as a logical workgroup with no physical barriers, and allows users to share
information and resources as though located on the same LAN.
XModem A protocol used to transfer files between devices. Data is grouped in 128-byte blocks and
error-corrected.