It’s a hardware factor which allows us to connect two or more than two network parts which are logically or physically classified by protocol. It’s not requirement to have a hardware machine always as some operating systems like windows, max, linux; max etc gives software which performs to do the different protocols. Generally this is found in protocol on wireless to cable.

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However in this sense, computer performs as a bridge by using bridging software. There are various wireless routers that gives either repeater or a bridge mode but al of them perform in similar way. Difference between them is that repeater mode is reliable on the similar protocol whereas bridge mode joiuns two different kinds of protocol.