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C-3
Bus
A single segment through which devices are connected. An Ethernet
LAN is based on a bus network which connects all communicating
workstations with a common cable.
Byte
A string that consists of eight data bits treated as a unit.
Call Guillotine
A feature that disconnects a call after a certain period of
time irrespective of whether data is being passed across the link or not.
CCITT
Comité Consultatif International Téléphonique et Télégraphique,
now renamed ITU, International Telecommunication Union.
CHAP
Challenge Handshake Authentication Protocol. Part of the PPP
protocol to ensure authentication of the connection between two devices.
Class
Type of IP address. IP addresses fall into three main classes, A, B
and C.
Client
A user whom is making use of a particular system resource or
peripheral through a workstation attached to a local or wide area network.
Client/server
A user who is attached to a file server to recover and
store files, but the processing of the data or use of an application is
carried out on the client machine.
Coaxial cable
A twin-conductor cable used for computer networking,
in either a thick or thin form. This cable consists of a centre core wire
(stranded or single core) covered by insulation, a second conductor of
woven wire, and an external covering of rubber. Thin coaxial cable
resembles television cable. Thick coaxial cable has an increased
diameter outer bore and is often yellow or orange in color.
CSMA/CD
Carrier Sense Multiple Access with Collision Detection, the
Ethernet protocol that allows each device to create and send its own data
packets. CSMA/CD is used to avoid excessive collisions between packets
as they are randomly transmitted. A CSMA/CD device first listens for other
carriers, if it detects no other carriers, it will then allow the data packet to
be transmitted. If a collision is detected, the device stops transmitting,
waits a random length of time, and begins transmitting again.