CS0-003 Incident Response and Management Practice Question
During the preparation phase of the NIST SP 800-61 incident response lifecycle, which of the following is the MOST important activity to ensure effective incident response?
⚠ Common exam trap
CS0-004 often tests the distinction between preparation and other phases, and candidates may confuse preventive controls (like segmentation) or detection tools (like YARA) as preparation activities, when the most critical preparation is the human team and its readiness.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Creating and training the incident response team
The preparation phase of NIST SP 800-61 is about establishing the capability to respond before an incident occurs. The single most critical element is having a trained, organized incident response team with defined roles, responsibilities, and communication channels. Without a competent team, detection tools, segmentation, and post-incident analysis cannot be effectively leveraged. NIST explicitly lists 'Incident Response Team' as a key preparation component, including team formation, training, and equipping.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using YARA rules to detect malware in the environment
Why it's wrong here
YARA rules scan files and memory for known malware signatures, which is detection during identification, not preparation. It is tempting because YARA is a genuine incident-response tool, and it would be the right choice when asked how to identify or classify malware samples once an incident is already underway.
- ✗
Implementing network segmentation to limit lateral movement
Why it's wrong here
Network segmentation is a containment control executed during detection and analysis or post-incident phases, not preparation. The stem asks for the most important preparatory activity, which is establishing communication plans, roles and access to tools before an incident occurs. Segmentation would be the right answer if the question asked how to limit lateral movement during active containment.
- ✗
Conducting a root cause analysis after each incident
Why it's wrong here
Root cause analysis happens during post-incident activity, so it cannot prepare anything before an incident occurs. It is the correct choice when the goal is to prevent recurrence by eliminating the underlying cause after containment and recovery.
- ✓
Creating and training the incident response team
Why this is correct
People execute the plan; without a formed, trained team, detection, analysis and containment stall regardless of tooling. Creating and training the incident response team during preparation directly satisfies the stem's requirement for effective response capability before an incident occurs.
Go deeper
Related to this question
Learn chapter
Endpoint Detection and Response
Key term
Detection
Detection is the process of identifying potential security incidents or anomalies by analyzing system data, logs, and network traffic.
Key term
Incident
An incident is a security event that violates an organization's policies or threatens its data, systems, or operations, requiring a structured response.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This CS0-004 practice question is part of Courseiva's free CompTIA 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 CS0-004 exam.