Posted on 2014-09-02
I have taken care of a network for a long time, and since it has switches, collisions don't seem to be a problem. But I started studying to take the Network + exam, and I can't seem to visualize the whole concept of a collision domain.
So if you have a hub ( which i am assuming, they don't exist anymore, but in theory ) then all the computers attached to the hub are in a collision domain.
but if you remove the hub, and replace it with a switch, then each computer connected to the switch becomes it's own collision domain. is that meaning that from the switch, along the wire to the computer, that is considered a collision domain? and why even bother calling it a collision domain? is it even possible for the computer to have a collision with itself? doesn't the switch prevent collisions because it examines packets ( or would it be frames? ) and only sends the packet to the correct port that the destination computer resides on? i get the collisions thing when every computer can send at the same time, and then csma\cd kicks in, so on a switch is it still a thing that every computer can send at the same time? but if the switch is only sending to the destination computer, how could a collision occur?