Prior to switches, Hubs were the standard for connecting devices on a local area network (LAN). The problem with hubs was that everything that went through them had to share the bandwidth of the link, bandwidth was wasted because all traffic was sent to all devices, and there were a lot of collisions because the hub didn’t do anything to prevent them. A switch fixes these problems.
ere are some facts about switches that you should know:
Switches work at Layer 2 of the OSI model, not Layer 1 like a hub
Switches switch Ethernet frames
Switches don’t look at IP address information, only Ethernet MAC addresses
Switches keeps a table of all MAC addresses traversing the switch and what port they are on (this table is called the bridge forwarding table or CAM table)
Switches only sends traffic to the devices that are the destination for that traffic, saving bandwidth
Each device connected to the switch gets the full bandwidth of the switch port because the switch prevents collisions
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