Quick Answer
Contain the breach is the correct first step because in any incident response, the immediate priority is to stop the attack from spreading and limit the scope of damage. This aligns with the NIST and SANS incident response frameworks, where containment—whether through isolating affected systems, disabling compromised accounts, or blocking malicious IPs—prevents further data exfiltration and preserves evidence for later forensic analysis. On the CISSP exam, this principle tests your understanding of the incident response lifecycle, often appearing in scenario-based questions where distractors include “notify authorities” or “assess damage.” A common trap is confusing concurrent activities with sequential priorities; while damage assessment may begin during containment, containment itself must come first to avoid escalating the breach. Remember the mnemonic “CIA before PIA”—Contain, Isolate, Assess before Public, Investigate, Announce.
This CISSP practice question tests your understanding of security and risk management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company experiences a data breach. Which step should be taken first according to best practices?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Inform affected parties
Why wrong: Notified after containment and assessment.
Contain the breach
Stops the incident from spreading and limits impact.
Notify law enforcement
Why wrong: Should be done after containment.
Assess the damage
Why wrong: Assessments start during containment but not the first step.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Contain the breach
Containing the breach is the immediate priority to prevent further damage. Notifying authorities and affected parties comes after containment. Assessing damage can happen concurrently but containment is first.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Inform affected parties
Why it's wrong here
Notified after containment and assessment.
Contain the breach
Why this is correct
Stops the incident from spreading and limits impact.
Clue confirmation
The clue words "best", "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Notify law enforcement
Why it's wrong here
Should be done after containment.
Assess the damage
Why it's wrong here
Assessments start during containment but not the first step.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
What to study next
Identify which CISSP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Security and Risk Management — This question tests Security and Risk Management — Read the scenario before looking for a memorised answer..
The correct answer is: Contain the breach — Containing the breach is the immediate priority to prevent further damage. Notifying authorities and affected parties comes after containment. Assessing damage can happen concurrently but containment is first.
Identify which CISSP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Yes — watch for: "best", "first". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CISSP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISSP exam.
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