CS0-003 Incident Response and Management Practice Question
A security analyst is investigating a potential data breach. The analyst needs to preserve evidence before containment. Which of the following actions is MOST appropriate at this stage?
⚠ Common exam trap
CS0-004 often tests the confusion between containment and evidence preservation, tricking candidates into selecting actions that alter system state or alert the attacker instead of preserving forensic evidence.
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 a forensic image of the hard drive
Creating a forensic image of the hard drive is the most appropriate action to preserve evidence before containment. A forensic image is a bit-for-bit copy of the storage media that captures the system state, including deleted files, memory remnants, and metadata, without altering the original. This preserves the integrity of evidence for later analysis and legal proceedings. Powering off, blocking IPs, or disabling accounts are containment actions that can destroy volatile evidence and should be done after imaging.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Powering off the system
Why it's wrong here
Powering off the system immediately destroys highly volatile data stored in RAM, such as running processes, active network connections, and uncommitted registry changes. This action violates the order of volatility, preventing analysts from recovering critical in-memory artifacts or decryption keys. Consequently, a graceful shutdown or hard power-off should be avoided until memory acquisition is complete.
- ✗
Blocking the attacker's IP at the firewall
Why it's wrong here
Blocking the attacker's IP address is a containment action that should only be executed after volatile evidence has been safely preserved. Implementing this block prematurely can alert the threat actor, prompting them to alter their tactics, delete local logs, or pivot to alternative infrastructure. Furthermore, it may disrupt active connections that could otherwise yield valuable network-forensics data.
- ✗
Disabling the user's account
Why it's wrong here
Disabling the compromised user account is a critical containment step, but performing it prior to forensic preservation can tip off the adversary. This action alters system state and log files, potentially overwriting or complicating the timeline of events. Analysts must prioritize capturing live system memory and disk images before modifying account statuses or access controls.
- ✓
Creating a forensic image of the hard drive
Why this is correct
Creating a bit-stream forensic image of the hard drive ensures that a mathematically precise copy of the non-volatile storage is preserved for analysis. This process utilizes write-blockers to prevent any modification to the original media, maintaining chain of custody and evidence integrity. It allows investigators to safely analyze deleted files, slack space, and system artifacts without altering the source system.
Go deeper
Related to this question
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Security Metrics and KPIs
Key term
Security
Security in IT is the practice of protecting systems, networks, and data from unauthorized access, damage, or theft.
Key term
Containment
Containment is the incident response phase where security teams isolate a compromised system or network to prevent the threat from spreading further while preserving evidence.
About these practice questions
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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.