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Class of Service
Class of Service (CoS). Class of Service is the 802.1p
priority scheme. CoS provides a method for tagging
packets with priority information. A CoS value
between 0-7 is added to the Layer II header of
packets, where zero is the lowest priority and seven is
the highest.
A overlapping transmission of two or more packets
that collide. The data transmitted cannot be used, and
the session is restarted.
Combo Ports
A single logical port with two physical connections,
including an RJ-45 connection and an SFP
connection.
CLI
Command Line Interface. A set of line commands
used to configure the system. For more information
on using the CLI, see Using the CLI.
Communities
Specifies a group of users which retains the same
system access rights.
CPU
Central Processing Unit. The part of a computer that
processes information. CPUs are composed of a
control unit and an ALU.
D
DHCP Client
An Internet host using DHCP to obtain configuration
parameters, such as a network address.
DSCP
DiffServe Code Point (DSCP). DSCP provides a
method of tagging IP packets with QoS priority
information.
Domain
A group of computers and devices on a network that
are grouped with common rules and procedures.
Duplex Mode
Permits simultaneous transmissions and reception of
data. There are two different types of duplex mode:
•
Full Duplex Mode — Permits for
bisynchronous communication, for example, a
telephone. Two parties can transmit information
at the same time.
•
Half Duplex Mode — Permits asynchronous
communication, for example, a walkie-talkie.
Only one party can transmit information at a
time.
E
Egress Ports
Ports from which network traffic is transmitted.
End System
An end user device on a network.
Ethernet
Ethernet is standardized as per IEEE 802.3. Ethernet
is the most common implemented LAN standard.
Supports data transfer rates of Mpbs, where 10, 100 or
1000 Mbps is supported.
405
Glossary
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