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Intermediate · 3 modules

Network Security & Defense

Ports, protocols, TLS, firewalls and detection, how networks are attacked and hardened.

▸ the territory
3 / 3 live

A map, not a checklist, see exactly where you are and what comes next.

  1. TCP/IP & the ports th…8m
  2. ✓TLS: what actually pr…9m
  3. ✓Firewalls, segmentati…8m

Lessons

read · then do
01TCP/IP & the ports that matterThe model under everything, and the services attackers look for first. 8 min read
02TLS: what actually protects the connectionTLS gives an HTTPS connection three guarantees — confidentiality, integrity, and server identity — and this lesson walks through how the handshake, certificate chains, and modern configuration actually deliver them. 9 min read
03Firewalls, segmentation & default-denyHow firewalls filter traffic by rules, why default-deny and network segmentation shrink your blast radius, and why a firewall alone never stops app-layer attacks. 8 min read
Start the first lesson