Firewalls and Intrusion Detection Systems
⏱ Estimated reading time: 1 min
Firewalls:
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Definition: Security systems that monitor and control network traffic between trusted and untrusted networks.
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Purpose: Block unauthorized access and allow safe traffic.
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Types:
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Packet-Filtering Firewall – Checks packets’ source, destination, and port.
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Stateful Inspection Firewall – Tracks active connections for context-aware filtering.
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Proxy Firewall – Acts as an intermediary between users and the internet.
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Next-Generation Firewall (NGFW) – Combines traditional firewall features with intrusion detection, application awareness, and malware protection.
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Intrusion Detection Systems (IDS):
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Definition: Monitors network or system activities to detect suspicious behavior or attacks.
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Types:
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Network-based IDS (NIDS) – Monitors network traffic for threats.
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Host-based IDS (HIDS) – Monitors a single system for unauthorized activity.
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Purpose: Alerts administrators about potential attacks; does not block by default (that’s done by IPS – Intrusion Prevention System).
Conclusion:
Firewalls and IDS are essential layers of network security, working together to protect systems from unauthorized access and cyber threats.
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