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Attack signature

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

An attack signature is a pattern used by an intrusion-prevention system to identify malicious or suspicious network activity.

An attack signature is an identifiable data pattern used by an intrusion-prevention system (IPS) to detect malicious or suspicious network activity. The IPS downloads signatures from its vendor rather than relying only on administrator-configured rules. section 11.5.2 section 11.6

Operationally, attack signatures support:

  • Detection of threats such as DoS and DDoS attacks, malware, reconnaissance attacks, and SQL injections. section 11.5.2
  • Predefined responses after detection, including blocking malicious traffic. section 11.5.2
  • Cisco NGIPS enhancements through Talos threat intelligence, contextual awareness, and Application Visibility and Control. section 11.5.2

Signature matching is complemented by anomaly detection: an IPS can establish a picture of typical network activity and identify deviations from that baseline. section 11.5.2

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines signature-based detection and contrasts it with anomaly detection, but does not detail signature formats or configuration commands.
Examples
Covers DoS/DDoS attacks, malware, reconnaissance attacks, and SQL injections as detectable threat examples.
What it assumes
Assumes familiarity with network traffic and security threats while defining IPS, NGFW, signatures, and anomaly detection.
What you can do after
Evaluate/understand how an IPS uses vendor signatures and anomalies to detect threats and trigger actions such as blocking traffic.
How it connects
Connects attack signatures with intrusion-prevention systems, next-generation firewalls, threat intelligence, and anomaly detection.
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