FundementalsFundementals Overview & L1 (Physical) OSI Model Network Devices Interfaces & Cables Common Ports Subnet & Masks WLANs L2 - L3 (Network Link) Packets (L3) MAC & Frame (L2) Routing (L3) IPv4 (L3 Address) IPv4 Headers DNS L4 (Transport) TCP-IP TCP & UDP L5 (Application) HTTP ICMP RPC CLI Git Linux Network Commands Router CLI