Incident Response (IR) is the organized way an organization detects, contains, and recovers from security incidents. When a breach lands, a phishing message works, or malware starts spreading, IR procedures move the team through detection, containment, eradication, recovery, and a lessons-learned review. Coordination and speed are what keep a bad day from turning into a catastrophic one.
A real program is more than a document. It needs a trained team, clear roles, communication plans that reach legal and management, and tools ready before the incident rather than scrambled together during it. Regular exercises matter because people improvise poorly under stress. The mistake that hurts most is rushing to wipe an infected host, which destroys the very evidence you later need for attribution or legal action. Documenting timelines and decisions as they happen also makes the eventual review far more useful.
How is incident response tested on the CISSP?
It is heavily covered in Domain 7: Security Operations. Know the lifecycle phases in order, team roles, evidence handling for possible legal proceedings, and how to run a post-incident review. The exam expects both the technical response and the coordination around it.