Originally LAN segmenting was implemented
using bridges. Learning bridges will look at source address of frames and
determine which nodes are located on which side of the bridge, or more precisely
they determine which nodes are connected to which ports. Bridges can perform
comprehensive frame translation.
Switches are a more recent discovery that implement functionality similar to bridging (connecting two or more LANs). The main difference is that switches can setup connections between multiple ports in parallel (which generally bridges cant), since they use a single CPU. One more important distinction is that the L2 switch will be able to implement all the forwarding in hardware (orders of magnitude faster) as compared to the bridge which does it in software.
Switches are a more recent discovery that implement functionality similar to bridging (connecting two or more LANs). The main difference is that switches can setup connections between multiple ports in parallel (which generally bridges cant), since they use a single CPU. One more important distinction is that the L2 switch will be able to implement all the forwarding in hardware (orders of magnitude faster) as compared to the bridge which does it in software.
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