10BASE2, 10BASE5, and 10BASE-T Ethernet would not work without CSMA/CD. However, because of the CSMA/CD algorithm, Ethernet becomes more inefficient under higher loads. In fact, during the years before LAN switches made these types of phenomena go away, the rule of thumb was that an Ethernet began to degrade when the load began to exceed 30 percent utilization.
In the next section, you will read about two things that have improved network performance, both relating to the reduction or even elimination of collisions: LAN switching and full-duplex Ethernet.
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