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Local Area Network Bridges - College Papers

Local Area Network Bridges

Both the physical distance that Local Area Network (LAN) can cover and the number of hosts that can be attached to it are limited. To overcome this limitation, bridges are introduced as devices which connect LANs at the MAC layer. The purpose of bridges is to allow hosts attached to different LANs to communicate as if they were located on the same LAN. In contrast to repeaters, that act at the physical layer and allow all traffic to cross LAN segments, bridges are more intelligent and limit the traffic to the section of the network on which it is relevant. To accomplish this, bridges must make a forwarding decision with each received frame regarding where to send the frame so that it ...

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may be more dynamic than in a single LAN due to possible bridge or LAN failures and hosts being moved around.
Bridge routing algorithms should meet the following requirements:
1) A bridges LAN environment should resemble a single LAN environment as closely as possible. In other words, the extension should be transparent to hosts.
2) The transparency requirement extends to performance requirements, such as low transmission delays, low undetected data corruption and FIFO maintenance.
3) Bridges routing algorithms should be able to adapt quickly to environment changes.

Source Routing Bridges

Source Routing is mostly used to interconnect token ring LANs. In Source-Routing, the source station must determine, in advance, the route to the LAN of the destination station, and include this route in the header of each frame. To determine the routing information, the source stations first issues a search frame, which is general an LCC TEST commands on its ring. If a response is ...

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PAPER DETAILS

Added: 2/5/2004 04:23:46 AM
Category: Science & Nature
Type: Premium Paper
Words: 1000
Pages: 4

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