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LOSSARY
Glossary-9
Terminal Access Controller Access Control System Plus (TACACS+)
TACACS+
is a logon authentication protocol that uses software running
on a central server to control access to TACACS-compliant devices on the
network.
Transmission Control Protocol/Internet Protocol (TCP/IP)
Protocol suite that includes TCP as the primary transport protocol, and IP
as the network layer protocol.
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.