🔐 NETWORK SECURITY
1. CIA Triad
2. Firewalls
3. VPN
4. Encryption
5. IDS/IPS
6. Defense in Depth
7. Real‑World Scenario
📌 Quick Facts
Firewall: filters traffic, can be stateful
VPN: encrypts data over public networks
AES is a common symmetric cipher
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🔍 DETAILS
CIA Triad
Confidentiality, Integrity, Availability – the three pillars of security.
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