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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In theory, once a device is configured and working it should stay that way, but, often, you will be working on a network which you didn’t configure, or you will be working on a shift pattern supporting many unfamiliar networks on which changes have been made, causing one or more issues for the company.