CS0-003 Incident Response and Management Practice Question
This CS0-003 practice question tests your understanding of incident response and management. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
During a post-compromise review, a developer accidentally committed a cloud access key to a public repository. Logs show the key was used from an unfamiliar IP. What should be done first? During eradication, which decision is most defensible? which action should be prioritized before closure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Disable or rotate the key and review actions performed with it
The exposed credential must be invalidated and its use scoped through audit logs. In eradication, responders need action that reduces risk while preserving the investigation record.
C
Block the developer's laptop from Wi-Fi
Why wrong: The risk is the exposed cloud key, not necessarily the laptop network.
D
Ask the developer to delete the commit only
Why wrong: Deleted commits may remain in clones and caches; the key is already compromised.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable or rotate the key and review actions performed with it
Option B is correct because the immediate priority is to invalidate the compromised credential (rotate or disable the key) to prevent further unauthorized access, and then review the actions performed with it to assess the scope of the breach. This aligns with the NIST SP 800-61 incident response lifecycle, specifically the containment phase, where stopping the attacker's access is paramount before eradication or closure.
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.
✗
Wait to see whether charges increase
Why it's wrong here
Waiting allows further abuse.
✓
Disable or rotate the key and review actions performed with it
Why this is correct
The exposed credential must be invalidated and its use scoped through audit logs. In eradication, responders need action that reduces risk while preserving the investigation record.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Block the developer's laptop from Wi-Fi
Why it's wrong here
The risk is the exposed cloud key, not necessarily the laptop network.
✗
Ask the developer to delete the commit only
Why it's wrong here
Deleted commits may remain in clones and caches; the key is already compromised.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between containment and eradication, where candidates mistakenly choose an eradication step (like blocking a laptop) before completing the critical containment action of revoking the compromised credential.
Detailed technical explanation
How to think about this question
Cloud access keys (e.g., AWS Access Key ID and Secret Access Key) are long-term credentials that grant programmatic access to cloud resources via APIs. Once leaked, they can be used from any IP to invoke actions like launching instances, reading S3 buckets, or escalating privileges. The first step is to disable or rotate the key using the cloud provider's IAM console or CLI (e.g., `aws iam update-access-key --status Inactive`), then review CloudTrail logs for API calls made with that key to determine the blast radius.
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: Disable or rotate the key and review actions performed with it — Option B is correct because the immediate priority is to invalidate the compromised credential (rotate or disable the key) to prevent further unauthorized access, and then review the actions performed with it to assess the scope of the breach. This aligns with the NIST SP 800-61 incident response lifecycle, specifically the containment phase, where stopping the attacker's access is paramount before eradication or closure.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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