Glossary
Spanning Tree Algorithm (STA)
A technology that checks your network for any loops. A loop can often o ccur in
complicated or backup linked network systems. Spanning Tree detects an d directs
data along the shortest available path, maximizing the performance an d efficiency of
the network.
Telnet
Defines a remote communication facility for interfacing to a terminal device over
TCP/IP.
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 ne twork .
Transmission Control Protocol/Internet Protocol (TCP/IP)
Protocol suite that includes TCP as the primary transport protocol, an d 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 s olely on the Ea rt h’s
rotation rate) with highly accurate atomic time. The UTC does not have daylig ht
saving time.
User Datagram Protocol (UDP)
UDP
provides a datagram mode for packet-switched communic ations. It use s IP as
the underlying transport mechanism to provide access to IP-like services. UDP
packets are delivered just like IP packets – connection-les s datagram s 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 sh are the sam e collision domain
regardless of their physical location or connection point in the netw ork. A VL AN
serves as a logical workgroup with no physical barriers, and allows use rs to sh are
information and resources as though located on the same LAN.
Virtual Router Redundancy Protocol (VRRP)
A protocol that uses a virtual IP address to support a primary router and multiple
backup routers. The backups can be configured to take over the w orkload if th e
master fails or to load share the traffic. The primary goal of VR RP is to allo w a host
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