A hub simply rebroadcasts every signal on every port to every other port, which (while inefficient and slow) is easy to create. A switch, on the other hand, intelligently directs traffic between systems by routing packets only to their proper destination.
Ultra pixen y3k mac#
To do this, it keeps track of the MAC addresses of the NICs plugged into each port. MAC addresses need to be unique or at least highly unlikely to be repeated for switches to identify different ports and devices, which is why manually setting a MAC address can have unexpected consequences in a switched network. Switches usually have a bunch of MAC addresses reserved in its MAC address table. When forwarding a frame, the switch first looks up the MAC address table by the destination MAC address of the frame for the outgoing port. If the outgoing port is found, the frame is forwarded rather than broadcast, so broadcasts are reduced. Since a switch has some intelligence, it can build the MAC address table automatically. The following part will illustrate how a switch learns MAC addresses.
There’s a switch in the middle and we have 3 computers around. All computers have a MAC address but they are simplified as AAA, BBB, and CCC.
The switch has a MAC address table and it will learn where all the MAC addresses are in the network. The switch has a MAC address table and here’s what will happen: Now, assuming Computer A is going to send something to Computer B:Ĭomputer A is going to send some data meant for computer B, thus it will create an Ethernet frame which has a source MAC address (AAA) and a destination MAC address (BBB).
The switch will build a MAC address table and only learns from source MAC addresses.
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