CS0-003 Incident Response and Management Practice Question
This CS0-003 practice question tests your understanding of incident response and 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.
After containing a ransomware outbreak, the incident response team needs to restore encrypted files. They have verified clean backups from two weeks ago, but some critical files were modified on the day of the attack. What is the best approach?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Restore critical files from backup and manually update them using change logs
Option B is correct because restoring critical files from backup and manually updating them using change logs preserves the modifications made on the day of the attack, which are not present in the two-week-old backups. This approach ensures data integrity by combining the clean baseline from backups with the legitimate changes recorded in change logs, avoiding data loss while maintaining security.
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.
✗
Restore from backups and then apply all available updates
Why it's wrong here
Updates do not recover specific file changes from the attack day.
✓
Restore critical files from backup and manually update them using change logs
Why this is correct
Preserves recent changes while using clean backups for the majority of files.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Attempt to decrypt files using the ransom key
Why it's wrong here
Paying ransom is discouraged and does not guarantee decryption.
✗
Restore all files from backups
Why it's wrong here
Loses all changes made in the last two weeks, including critical modifications.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that restoring from the most recent clean backup is always sufficient, ignoring the need to preserve post-backup legitimate changes, which leads candidates to choose Option D.
Detailed technical explanation
How to think about this question
In ransomware incidents, file system journaling or versioning systems (e.g., NTFS USN journal, VSS snapshots) can track changes, but backups typically capture point-in-time states. Change logs, such as those from database transaction logs or application audit trails, allow granular replay of modifications after a base restore, ensuring consistency without reintroducing malware. This method aligns with the NIST SP 800-61 incident response recovery phase, emphasizing selective restoration to minimize data loss.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Restore critical files from backup and manually update them using change logs — Option B is correct because restoring critical files from backup and manually updating them using change logs preserves the modifications made on the day of the attack, which are not present in the two-week-old backups. This approach ensures data integrity by combining the clean baseline from backups with the legitimate changes recorded in change logs, avoiding data loss while maintaining security.
What should I do if I get this CS0-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". 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.
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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