collision domain

Collision domain - All nodes (devices) on a network that are capable of causing a collision (when two devices talk at the same time)

A 24 port hub has 1 collision domain - all devices attached can cause collisions

A 24 port switch has 24 collision domains - each port is its own collision domain- meaning that a switch can accept traffic on all 24 ports at the same time.

So the best way to increase your collision domains is to go from hubs to switches.

cp

Due to the fact that with a hub all pc's are connected to the same physical cable, a collision may exist when 2 machines want to send data to the cable at the same time. Nic card have a sensing method in order to know when to trasnmitt. CSMA/CD means carrier sense multiple address/collision detect. Thats the protocol name!.
Domain: all the machines connected to the same cable or hub or cascade of hubs
If you have many pc's on the network (same cable) the traffic will be high, thus a "free cable sensing" in order to transmit something wont't be easy to find. This cause delay, slow response times, etc, etc,
By adding a layer 2 switch you will divide the collision domain into one domain per switch port.

Hope it's clear enought

This question was auto closed due to inactivity