This lecture discusses two main techniques to protect your network: Intrusion Detection Systems (IDS) and Firewalls. The IDS part discusses host-based versus network-based ID systems, passive versus reactive systems, as well as the main operation of an IDS (data capturing, signature versus anomaly-based operation). The firewall part compares different kind of firewalls: network-level, transport-level as well as application-level firewalls, and discusses stateless versus stateful systems. the lec

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