The correct answer is Detection and Analysis, along with Preparation, as the two key components of a successful incident response plan under NIST SP 800-61. Preparation is the foundational phase that ensures an organization has the necessary policies, trained personnel, and tools in place before any incident occurs, while Detection and Analysis is the critical second phase that focuses on identifying, validating, and analyzing security events through continuous monitoring, alerting, and forensic investigation. On the CompTIA SecurityX CAS-004 exam, this question tests your understanding of the NIST incident response lifecycle phases, often appearing as a multiple-select item where distractors like “Containment” or “Recovery” are listed as separate phases rather than grouped with Eradication. A common trap is to forget that NIST combines Containment, Eradication, and Recovery into a single phase, leaving Detection and Analysis as a distinct, standalone phase. To remember, think of the acronym PD-CER-PI: Preparation, Detection and Analysis, Containment/Eradication/Recovery, and Post-Incident Activity.
CAS-004 Security Operations Practice Question
This CAS-004 practice question tests your understanding of security operations. 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.
Which TWO of the following are key components of a successful incident response plan according to NIST SP 800-61?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Preparation
NIST SP 800-61 defines the incident response lifecycle as having four phases: Preparation, Detection and Analysis, Containment/Eradication/Recovery, and Post-Incident Activity. Preparation (Option B) is the foundational phase that ensures the organization has the tools, policies, and trained personnel ready before an incident occurs. Detection and Analysis (Option E) is the second phase, focusing on identifying and validating security incidents through monitoring, alerting, and forensic analysis.
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 scanning
Why it's wrong here
Vulnerability scanning is a security assessment technique, not a phase of the incident response plan.
✓
Preparation
Why this is correct
Preparation is a foundational phase of the incident response lifecycle.
Related concept
Read the scenario before looking for a memorised answer.
✗
Patch management
Why it's wrong here
Patch management is an ongoing maintenance process, not a phase of incident response.
✗
User training
Why it's wrong here
User training is part of preparation but is not a separate phase in the NIST incident response lifecycle.
✓
Detection and Analysis
Why this is correct
Detection and Analysis is a critical phase in the incident response lifecycle.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between activities that are part of the incident response lifecycle phases versus supporting security processes, leading candidates to mistakenly select vulnerability scanning or patch management as core components when they are actually separate operational tasks.
Detailed technical explanation
How to think about this question
Under the hood, NIST SP 800-61 Rev. 2 explicitly defines the four phases in Section 3.2, with Preparation including establishing incident response capability, creating policies, and acquiring tools like forensic workstations and encrypted communication channels. Detection and Analysis involves correlating logs from multiple sources (e.g., SIEM, IDS/IPS, netflow) using techniques like signature-based detection and anomaly analysis to reduce false positives. In a real-world scenario, a SOC might use the Preparation phase to pre-deploy jump boxes and chain-of-custody forms, while Detection and Analysis would involve analyzing a suspicious SMB connection attempt using Zeek logs and Windows Event ID 5140.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Preparation — NIST SP 800-61 defines the incident response lifecycle as having four phases: Preparation, Detection and Analysis, Containment/Eradication/Recovery, and Post-Incident Activity. Preparation (Option B) is the foundational phase that ensures the organization has the tools, policies, and trained personnel ready before an incident occurs. Detection and Analysis (Option E) is the second phase, focusing on identifying and validating security incidents through monitoring, alerting, and forensic analysis.
What should I do if I get this CAS-004 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.
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Question Discussion
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