G
LOSSARY
Glossary-10
Trivial File Transfer Protocol (TFTP)
A TCP/IP protocol commonly used for software downloads.
Universal Time Coordinate (UTC)
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.
User Datagram Protocol (UDP)
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.
Virtual LAN (VLAN)
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.
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