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Networking Fundamentals
You can't secure a network you can't read. This path covers addressing, subnets, ports and protocols, so that scan results, firewall rules and packet captures start to make sense.
10 Fundamentals
Addressing
IPv4 addresses, subnet masks and the private ranges you'll meet on every network.
- IP Addresses & Subnets guidedeasy 40 min
- How Machines Find Each Other guidedeasy 25 min
Names and Services
How names turn into addresses, what ports are, and how to talk to a web server by hand.
- Names and DNS guidedeasy 30 min
- Ports and Services guidedeasy 25 min
- Talking to a Web Server guidedeasy 30 min
20 Skill Building
Reading Traffic
Watch what actually crosses the wire, cut it down to the part that matters, and read the rules that decide what gets through at all.
- Watching Packets guidedeasy 25 min
- Filtering the Noise guidedmedium 30 min
- Firewall Rules guidedmedium 30 min