The correct immediate action is to disable the compromised service account, not just delete the key. This is because disabling the service account instantly revokes all authentication and authorization for that identity, cutting off the attacker’s access to Cloud Storage buckets and any other resources, while preserving the account and its configuration for forensic investigation. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of the principle of least privilege combined with incident response—specifically, that disabling an identity is a reversible, faster mitigation than key deletion, which only removes one credential but leaves other keys active. A common trap is choosing to delete the key alone, which fails to block access if the attacker has other keys or cached tokens. Remember the memory tip: “Disable the identity, not just the key—stop the actor, not the artifact.”
PCSE Practice Question: Managing operations in a cloud solution environment
This PCSE practice question tests your understanding of managing operations in a cloud solution environment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A security engineer is investigating a potential data breach in a Google Cloud environment. The engineer suspects that a compromised service account key was used to access Cloud Storage buckets. Which TWO actions should the engineer take immediately to mitigate the risk?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable the service account
Disabling the service account immediately stops all access using any of its keys, including the compromised one, without deleting the account or its configuration. This is the fastest way to block the attacker while preserving the ability to investigate and re-enable the account later if needed. In Google Cloud, disabling a service account is a reversible action that revokes all authentication and authorization for that identity.
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.
✓
Disable the service account
Why this is correct
Disabling the service account immediately revokes all access for that account.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Revoke all IAM roles granted to the service account
Why it's wrong here
This does not prevent access via the key if the key itself is still valid; the service account still exists.
✗
Rotate the service account key
Why it's wrong here
Rotation creates a new key but the old key remains valid until deleted, so immediate risk persists.
✓
Delete the compromised service account key
Why this is correct
Deleting the key immediately invalidates it.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Cloud Audit Logs for the service account
Why it's wrong here
This helps with investigation but does not mitigate the immediate threat.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between disabling a service account (which stops all access immediately) versus deleting or rotating a key (which may leave other keys or a window of exposure), and candidates mistakenly choose 'rotate the key' thinking it invalidates the old key, but rotation alone does not delete the old key.
Detailed technical explanation
How to think about this question
Service account keys are RSA private keys used to sign JSON Web Tokens (JWTs) for OAuth 2.0 authentication. When a key is compromised, the attacker can generate valid access tokens until the key is revoked. Disabling the service account (Option A) immediately invalidates all tokens and prevents new token issuance, while deleting the compromised key (Option D) ensures that specific key cannot be used again. In a real-world scenario, an attacker might have exfiltrated data using the key; disabling the account first stops the bleeding, then deleting the key prevents reuse after re-enabling.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Managing operations in a cloud solution environment — This question tests Managing operations in a cloud solution environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Disable the service account — Disabling the service account immediately stops all access using any of its keys, including the compromised one, without deleting the account or its configuration. This is the fastest way to block the attacker while preserving the ability to investigate and re-enable the account later if needed. In Google Cloud, disabling a service account is a reversible action that revokes all authentication and authorization for that identity.
What should I do if I get this PCSE 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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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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