Network Security | IDS vs IPS, Types of IDS & Detection Methods

A complete beginner-friendly lecture on network security and intrusion detection. Learn the CIA triad, LAN vs. WAN, routers, switches, and firewalls, what an intrusion actually is, and the critical difference between IDS and IPS. We break down signature, anomaly, and protocol anomaly detection, plus NIDS, HIDS, log file monitoring, and file integrity checking with real-world examples and intrusion indicators you can spot today.