The answer is Detection and Analysis, Containment, Eradication, and Recovery, and Post-Incident Activity. These three represent the core operational phases of the NIST incident response lifecycle as defined in NIST SP 800-61, with Preparation serving as the foundational fourth phase that enables them. Detection and Analysis involves identifying anomalies and determining their scope, while Containment, Eradication, and Recovery focuses on stopping the threat and restoring systems, and Post-Incident Activity ensures lessons learned are documented to prevent recurrence. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your ability to distinguish the active response phases from the preparatory work—a common trap is including Preparation as an essential step during an active incident, when it actually occurs before any incident begins. Remember the mnemonic “DCP” for the three active phases: Detect, Contain, Post.
CHFI Incident Response and First Responder Skills Practice Question
This CHFI practice question tests your understanding of incident response and first responder skills. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which THREE of the following are essential steps in the incident response process as defined by NIST SP 800-61? (Select exactly 3.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Post-Incident Activity
Option B is correct because Post-Incident Activity is one of the four core phases in the NIST SP 800-61 incident response lifecycle. This phase includes lessons learned, evidence retention, and report generation to improve future response efforts. Without this step, the organization cannot close the loop on security incidents or refine their detection and response capabilities.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Vulnerability Assessment
Why it's wrong here
Vulnerability assessment is a separate proactive security activity, not a step in incident response.
✓
Post-Incident Activity
Why this is correct
This phase includes lessons learned and evidence retention.
Related concept
Read the scenario before looking for a memorised answer.
✓
Preparation
Why this is correct
Preparation is the first phase, involving training, tools, and procedures.
Related concept
Read the scenario before looking for a memorised answer.
✓
Detection and Analysis
Why this is correct
This phase involves identifying and analyzing potential incidents.
Related concept
Read the scenario before looking for a memorised answer.
✗
Penetration Testing
Why it's wrong here
Penetration testing is a proactive assessment, not part of incident response.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between proactive security activities (like vulnerability assessments and penetration testing) and the reactive incident response phases defined in NIST SP 800-61, leading candidates to mistakenly select those proactive options as part of the incident response process.
Detailed technical explanation
How to think about this question
NIST SP 800-61 Rev. 2 defines the incident response lifecycle as a continuous process with four phases: Preparation, Detection and Analysis, Containment Eradication and Recovery, and Post-Incident Activity. The Post-Incident Activity phase specifically mandates the creation of a 'lessons learned' report, evidence retention for legal or forensic purposes (often following RFC 3227 guidelines), and updating incident response policies based on findings. In real-world scenarios, failure to perform this phase can lead to repeated incidents due to unaddressed root causes or inadmissible evidence in court.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Incident Response and First Responder Skills — This question tests Incident Response and First Responder Skills — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Post-Incident Activity — Option B is correct because Post-Incident Activity is one of the four core phases in the NIST SP 800-61 incident response lifecycle. This phase includes lessons learned, evidence retention, and report generation to improve future response efforts. Without this step, the organization cannot close the loop on security incidents or refine their detection and response capabilities.
What should I do if I get this CHFI question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This CHFI practice question is part of Courseiva's free EC-Council 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 CHFI exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.