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.
After a high-priority SOC escalation, 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 response best matches incident-response practice?
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.
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 in incident response is to contain the breach by disabling or rotating the compromised cloud access key, which prevents further unauthorized use. Reviewing actions performed with the key is essential to assess the scope of the incident, such as data exfiltration or resource manipulation, aligning with the NIST SP 800-61 containment, eradication, and recovery phases. This approach follows the SANS PICERL model, where containment (disabling the key) precedes eradication and recovery.
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 words "best", "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 misconception that physical or network-level controls (like blocking Wi-Fi) are sufficient for cloud credential exposure, when in fact the correct first step is to invalidate the credential itself through rotation or disabling.
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, once exposed, can be used to call APIs like IAM, S3, or EC2 until revoked. Under the hood, cloud providers log each API call with source IP, user agent, and request details in services like AWS CloudTrail or Azure Monitor; reviewing these logs helps identify the attacker's actions, such as listing S3 buckets or launching instances. In a real-world scenario, a compromised key might be used to spin up cryptocurrency miners, leading to massive bills if not disabled immediately.
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 in incident response is to contain the breach by disabling or rotating the compromised cloud access key, which prevents further unauthorized use. Reviewing actions performed with the key is essential to assess the scope of the incident, such as data exfiltration or resource manipulation, aligning with the NIST SP 800-61 containment, eradication, and recovery phases. This approach follows the SANS PICERL model, where containment (disabling the key) precedes eradication and recovery.
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", "first". 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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