CsMa/CD
Carrier sense multiple access with collision detection (CSMA/CD) is one of the most
popular access methods in use today. With CSMA/CD, every host has equal access
to the wire and can place data on the wire when the wire is free from traffic. If a host
wishes to place data on the wire, it will "sense" the wire and determine whether
there is a signal already on the wire. If there is, the host will wait to transmit the data;
if the wire is free, the host will send the data, as shown in Figure 1-29.