G
LOSSARY
165
Forwarding Database
A database that is stored by a switch to determine if a packet should
be forwarded, and which port should forward the packet if it is to be
forwarded. Also known as Switch Database.
filtering
The process of screening a packet for certain characteristics, such as
source address, destination address, or protocol. Filtering is used to
determine whether traffic is to be forwarded, and can also prevent
unauthorized access to a network or network devices.
flow control
A congestion control mechanism. Congestion is caused by devices
sending traffic to already overloaded port on a Switch. Flow control
prevents packet loss and inhibits devices from generating more traffic
until the period of congestion ends.
full duplex
A system that allows packets to be transmitted and received at the
same time and, in effect, doubles the potential throughput of a link.
Gigabit Ethernet
IEEE standard 802.3z for 1000Mbps Ethernet; it is compatible with
existing 10/100Mbps Ethernet standards.
half duplex
A system that allows packets to transmitted and received, but not at
the same time. Contrast with
full duplex
.
hub
A device that regenerates LAN traffic so that the transmission distance
of that signal can be extended. Hubs are similar to repeaters, in that
they connect LANs of the same type; however they connect more LANs
than a repeater and are generally more sophisticated.
IEEE
Institute of Electrical and Electronics Engineers. This American
organization was founded in 1963 and sets standards for computers
and communications.
IEEE 802.1D
A standard that defines the behavior of bridges in an Ethernet network.
IEEE 802.1p
A standard that defines GMRP and traffic prioritization.
IEEE 802.1Q
A standard that defines VLAN tagging.
IEEE 802.3x
A standard that defines a system of flow control for ports that operate
in full duplex.
IETF
Internet Engineering Task Force. An organization responsible for
providing engineering solutions for TCP/IP networks. In the network
management area, this group is responsible for the development of the
SNMP protocol.
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