Networks, Cables, OSI, and TCP Models
CSMA/CD, Switching, and VLANs
Trunking, DTP, and Inter-VLAN Routing
Router and Switch Security
Network Address Translation
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Carrier sense, multiple access with collision detection (CSMA/CD) can be broken down as follows: Carrier sense means that the wire is listened to in order to determine whether there is a signal passing along it. A frame cannot be transmitted if the wire is in use.