CCNA Cisco Certified Network Associate Study Guide - FTP Server

Glossary 711
synchronous transmission Signals transmitted digitally with precision
clocking. These signals have identical frequencies and contain individual
characters encapsulated in control bits (called start/stop bits) that designate
the beginning and ending of each character. See also: asynchronous transmission
and isochronous transmission.
T reference point Used with an S reference point to change a 4-wire ISDN
network to a 2-wire ISDN network.
T1 Digital WAN that uses 24 DS0s at 64K each to create a bandwidth of
1.536Mbps, minus clocking overhead, providing 1.544Mbps of usable
bandwidth.
T3 Digital WAN that can provide bandwidth of 44.763Mbps.
tag switching Based on the concept of label swapping, where packets or
cells are designated to defined-length labels that control the manner in which
data is to be sent, tag switching is a high-performance technology used for
forwarding packets. It incorporates Data-Link layer (Layer 2) switching and
Network layer (Layer 3) routing and supplies scalable, high-speed switching
in the network core.
tagged traffic ATM cells with their cell loss priority (CLP) bit set to 1.
Also referred to as discard-eligible (DE) traffic. Tagged traffic can be eliminated
in order to ensure trouble-free delivery of higher priority traffic, if the
network is congested. See also: CLP.
TCP Transmission Control Protocol: A connection-oriented protocol that
is defined at the Transport layer of the OSI reference model. Provides reliable
delivery of data.
TCP/IP Transmission Control Protocol/Internet Protocol. The suite of protocols
underlying the Internet. TCP and IP are the most widely known
protocols in that suite. See also: IP and TCP.
TDM time division multiplexing: A technique for assigning bandwidth on
a single wire, based on preassigned time slots, to data from several channels.
Bandwidth is allotted to each channel regardless of a station’s ability to send
data. See also: ATDM, FDM, and multiplexing.