After detecting the collision, all units must reset and attempt to re- transmit the data. The more traffic on a wire, the more likely collisions are to occur. The more collisions, the more retransmits which means more traffic on the wire. Ultimately, the network gets REAL sluggish. What is a Switch Switches are a vast improvement over hubs because they limit Collision Domains.
Switches move packets across the wire from port to port.
They handle this task in different ways depending on how the switch is configured. This was is very safe since you reduce the passing of bad frames nearly completely. This form of switching is extremely fast since the switch never has to wait and examine each Ethernet frame as it comes in. However, because the switch DOES NOT do this, there is a chance it may pass a bad frame. Most common switches will allow both of these formats to be assigned, and some even allow hybrids of these two methods.