Dell PowerConnect 54 Series, User Manual

Page: 405 / 416

Glossary
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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.