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Security Operations · Foundational

Containment

The incident response phase that limits the spread and impact of an incident while preserving evidence.

Definition

Containment strategies include isolating hosts, segmenting networks, disabling accounts, blocking IPs and domains, and taking systems offline. Short-term containment stops damage quickly; long-term containment keeps business running while preparing eradication. Strategy choice weighs evidence preservation, service availability and attacker awareness.

Example

Isolating infected endpoints via EDR and blocking the C2 domain at the firewall.

Exam tip

Containment comes before eradication; isolation and segmentation are classic answers.

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