Computer Networking › Section H · Security in computer networks › Topic H.9
Operational security: firewalls and intrusion detection
Cryptography protects data in transit, but an organisation also has to decide which traffic may enter or leave its network at all, and notice when something gets through anyway. Firewalls enforce that decision and intrusion detection systems watch for trouble.
In this topic
- Guarding the border
- Stateless packet filters
- Worked example: applying an ordered rule list
- Stateful filters
- Application gateways
- Where firewalls go
- Intrusion detection systems
- Signatures and anomalies
- Worked example: the false-alarm problem
- Common mistakes to avoid
- Key takeaways
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