Networking Basics Study Guide
You'll find some study resources for network basics and beyond here.
OSI Reference Model
Best OSI Reference Model explanation in the world from Kelly Handerhan:
IP Protocol
This is so basic and so boring (to me). I just can't get my head around it.
Important topics are: CIDR, gateways, subnetting
IpTables / Firewall
Best Network Monitoring tools
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