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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Before switches were invented, every device on a network would receive data from every other device. Every time a frame was detected on the wire, the PC would have to stop for a moment and check the header to see whether it was the intended recipient. Imagine hundreds of frames going out on the network every minute. Every device would soon grind to a halt.