DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
The CloudFormation template in the exhibit deploys an S3 bucket with a bucket policy. After deployment, the DevOps team discovers that the bucket is publicly accessible. Which change should be made to prevent public access while allowing only authenticated users from a specific AWS account to read objects?
Change the Principal to the AWS account ID of the allowed account
Restricts access to a specific account.
C
Change the Principal to "*" and add a condition for aws:SourceIp
Why wrong: Principal "*" is still public.
D
Set the bucket's 'BlockPublicAccess' property to true
Why wrong: This is a valid change but the question asks to modify the policy to allow specific account; blocking public access would also block the intended access if not combined with explicit allow.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Change the Principal to the AWS account ID of the allowed account
Option B is correct because changing the Principal to a specific AWS account ID ensures that only that account's IAM users/roles can access the bucket, preventing public access. Option A is incorrect because AWS Organizations does not directly block public access at the bucket level; it can set service control policies but not a bucket policy. Option C is incorrect because using Principal "*" with a condition for aws:SourceIp still allows any user with that IP (including unauthenticated) to access, and it does not restrict to a specific AWS account. Option D is incorrect because setting BlockPublicAccess to true would block all public access, including the intended access from the specific account, which is not the goal.
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.
✗
Enable AWS Organizations to block public access
Why it's wrong here
Not a template change.
✓
Change the Principal to the AWS account ID of the allowed account
Why this is correct
Restricts access to a specific account.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the Principal to "*" and add a condition for aws:SourceIp
Why it's wrong here
Principal "*" is still public.
✗
Set the bucket's 'BlockPublicAccess' property to true
Why it's wrong here
This is a valid change but the question asks to modify the policy to allow specific account; blocking public access would also block the intended access if not combined with explicit allow.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Quick reference
AWS S3 Storage Class Comparison
Storage Class
Min Duration
Retrieval
Use Case
S3 Standard
None
Immediate
Frequently accessed data
S3 Standard-IA
30 days
Immediate
Infrequent access, rapid retrieval
S3 One Zone-IA
30 days
Immediate
Non-critical infrequent data
S3 Intelligent-Tiering
None
Immediate–hours
Unknown or changing access patterns
S3 Glacier Instant
90 days
Milliseconds
Archive with instant retrieval
S3 Glacier Flexible
90 days
Minutes–hours
Archive, flexible retrieval
S3 Glacier Deep Archive
180 days
Hours
Long-term compliance archive
What to study next
Got this wrong? Here's your next step.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Change the Principal to the AWS account ID of the allowed account — Option B is correct because changing the Principal to a specific AWS account ID ensures that only that account's IAM users/roles can access the bucket, preventing public access. Option A is incorrect because AWS Organizations does not directly block public access at the bucket level; it can set service control policies but not a bucket policy. Option C is incorrect because using Principal "*" with a condition for aws:SourceIp still allows any user with that IP (including unauthenticated) to access, and it does not restrict to a specific AWS account. Option D is incorrect because setting BlockPublicAccess to true would block all public access, including the intended access from the specific account, which is not the goal.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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