Bridges. Computing network components

Hubs

Repeaters

COMPUTING NETWORK COMPONENTS

The following devices are used for linking different LANs or LAN segments together.

A repeater takes a weak signal from one segment, regenerates it (amplifies it), and passes it to the next segment. Repeaters do not act as a filter to restrict the flow of problem traffic. A repeater connects two segments of similar or dissimilar media, regenerates the signal to increase transmitting distance and passes all traffic in both directions.

Hub's major function is to replicate data it receives from one device attached to it to all others. Hubs differ in the amount of devices that can connect to them, the length of wire that can transmit on, and the type of media they support. Hubs that connect a small number of devices are usually referred to as mini-hubs. Hubs can be active, passive and hybrid.

Bridges are simpler and less expensive then routers. Bridges make a simple decision on which packets to send across two segments they connect. Bridges can be used to expand the distance of a segment, reduce traffic bottlenecks resulting from an excessive number of attached computers, link unlike physical media such as twisted-pair and coaxial Ethernet and link unlike network segments such as Ethernet and Token Ring, and forward packets between them.

Дата добавления: 2014-12-27