Hello friends, In this blog post(Bridge Advantage and Disadvantage In Computer Network) I am going to let you know about the bridge along with its advantages and disadvantages in the field of computer networks.
Within this blog(Bridge Advantage and Disadvantage In Computer Network) We will also see how a bridge helps in communication networks related to the OSI model.
The bridge is a device that is attached to two or more LANs to create an extended LAN.
It takes MAC frames from one LAN and sends them across to another LAN. A frame is sent across the bridge only if its destination is in the other LAN.
The interconnected LANs need not be of the same type. A bridge can have more than two ports. It operates in both the physical and the data link layers of the OSI model.
Bridges operate in both the physical and data link layers of the OSI model while repeaters operate only on the physical layer of the OSI model.
Different from repeaters, bridges contain logic that allows them to keep the traffic for each segment separate.
In this way, they filter traffic, a fact that, makes them useful for controlling congestion and isolation problem links.
bridges can also provide security through this partitioning of traffic. Traffic can divide a large network into smaller segments.
They can also relay frames between two originally separate LANs. When a frame enters a bridge, the bridge not only regenerates the signal but checks the address of the destination and forwards the new copy only to the segment to which the address belongs.
As a bridge encounters a packet, it reads the address contained in the frame and compares that address with a table of all the stations on both segments.
When it finds a match, it discovers to which segment the station belongs and relays the packet only to that segment.
But a repeater installed on a link receives the signal before it becomes too weak or corrupted, regenerates the original bit pattern, and puts the refreshed copy back onto the link or it does not search the address of destination like bridges.
The timing properties of the MAC protocol allow cables up to 2.5km, but the transceiver chips can only provide enough power to drive 500 meters.
The solution is to use repeaters to extend the cable length where that is desired.
Bridges can make minor changes to the frame before forwarding it,
such as adding and deleting some fields from the frame header.
Since they are data link layer devices. They do not deal with headers at layer 3 and above and can not make changes or decisions that depend on them.
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