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Network Defense Mechanisms

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Firewalls and IDS/IPS

  • Firewall: A network security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and an untrusted external network (Internet).

    • Packet Filtering: Checks simple header info (IP, Port).
    • Stateful Inspection: Tracks the state of active connections.

  • IDS (Intrusion Detection System): Monitors network traffic for suspicious activity and sends alerts. It is passive (it watches).

  • IPS (Intrusion Prevention System): sits in-line with traffic and can actively block malicious traffic. It is active (it acts).