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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You need to know this and you don’t! I know, I’m not helping much, but address classes are actually only significant historically, so as a new Cisco engineer, you might become confused when you look at the old rules and try to apply them to new methods of network design.