164GLOSSARY

BOOTP

The BOOTP protocol allows you to automatically map an IP address to a

 

given MAC address each time a device is started. In addition, the

 

protocol can assign the subnet mask and default gateway to a device.

bridge

A device that interconnects two LANs of a different type to form a

 

single logical network that comprises of two network segments.

 

Bridges learn which endstations are on which network segment by

 

examining the source addresses of packets. They then use this

 

information to forward packets based on their destination address. This

 

process is known as filtering.

broadcast

A packet sent to all devices on a network.

broadcast storm

Multiple simultaneous broadcasts that typically absorb all the available

 

network bandwidth and can cause a network to fail. Broadcast storms

 

can be due to faulty network devices.

collision

A term used to describe two colliding packets in an Ethernet network.

 

Collisions are a part of normal Ethernet operation, but a sudden

 

prolonged increase in the number of collisions can indicate a problem

 

with a device, particularly if it is not accompanied by a general increase

 

in traffic.

CSMA/CD

Carrier-sense Multiple Access with Collision Detection. The protocol

 

defined in Ethernet and IEEE 802.3 standards in which devices transmit

 

only after finding a data channel clear for a period of time. When two

 

devices transmit simultaneously, a collision occurs and the colliding

 

devices delay their retransmissions for a random length of time.

endstation

A computer, printer or server that is connected to a network.

Ethernet

A LAN specification developed jointly by Xerox, Intel and Digital

 

Equipment Corporation. Ethernet networks use CSMA/CD to transmit

 

packets at a rate of 10Mbps over a variety of cables.

Ethernet address

See MAC address.

Fast Ethernet

An Ethernet system that is designed to operate at 100Mbps.

forwarding

The process of sending a packet toward its destination using a

 

networking device.

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3Com 9100 manual Bridge, Broadcast storm, Collision, Endstation, Fast Ethernet, Forwarding