SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident 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.
Exhibit
Refer to the exhibit.
Resource: "arn:aws:ec2:us-east-1:123456789012:instance/*"
Condition: {
"StringEquals": {
"aws:SourceVpce": "vpce-0a1b2c3d4e5f67890"
}
}
The above condition is added to an S3 bucket policy to restrict access to a specific VPC endpoint. An EC2 instance in the same VPC is unable to access the bucket. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Exhibit
Refer to the exhibit.
Resource: "arn:aws:ec2:us-east-1:123456789012:instance/*"
Condition: {
"StringEquals": {
"aws:SourceVpce": "vpce-0a1b2c3d4e5f67890"
}
}
A
The condition should use aws:SourceVpc instead of aws:SourceVpce
Why wrong: For gateway endpoints, use aws:SourceVpc; for interface endpoints, use aws:SourceVpce. But the resource ARN issue is more fundamental.
B
The EC2 instance does not have a public IP address
Why wrong: Access via VPC endpoint does not require public IP.
C
The VPC endpoint policy does not allow the s3:GetObject action
Why wrong: The exhibit does not mention endpoint policy.
D
The resource ARN in the policy is for EC2, not for S3
An S3 bucket policy must have resource ARN for S3, such as arn:aws:s3:::bucket-name.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The resource ARN in the policy is for EC2, not for S3
Option D is correct because the resource ARN in the policy must reference the S3 bucket (e.g., arn:aws:s3:::bucket-name/*), not an EC2 resource. If the ARN is for EC2, the policy will not apply to S3 operations, causing the EC2 instance to be denied access regardless of the VPC endpoint condition. S3 bucket policies only take effect when the Resource element specifies the S3 bucket ARN.
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.
✗
The condition should use aws:SourceVpc instead of aws:SourceVpce
Why it's wrong here
For gateway endpoints, use aws:SourceVpc; for interface endpoints, use aws:SourceVpce. But the resource ARN issue is more fundamental.
✗
The EC2 instance does not have a public IP address
Why it's wrong here
Access via VPC endpoint does not require public IP.
✗
The VPC endpoint policy does not allow the s3:GetObject action
Why it's wrong here
The exhibit does not mention endpoint policy.
✓
The resource ARN in the policy is for EC2, not for S3
Why this is correct
An S3 bucket policy must have resource ARN for S3, such as arn:aws:s3:::bucket-name.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates focus on the VPC endpoint condition (aws:SourceVpce vs aws:SourceVpc) and overlook the fundamental requirement that the Resource ARN must match the S3 bucket, not the EC2 instance.
Detailed technical explanation
How to think about this question
S3 bucket policies use the Principal element to specify who the policy applies to, but when using a VPC endpoint, the condition key aws:SourceVpce or aws:SourceVpc is used to restrict access based on network origin. The Resource ARN must exactly match the S3 bucket (e.g., arn:aws:s3:::example-bucket/*) for the policy to be evaluated against S3 API calls; an incorrect ARN (e.g., for EC2) causes the policy to be ignored for S3 operations. In real-world scenarios, misconfigured ARNs are a common cause of 'Access Denied' errors that are hard to debug because the policy appears correct otherwise.
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.
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The resource ARN in the policy is for EC2, not for S3 — Option D is correct because the resource ARN in the policy must reference the S3 bucket (e.g., arn:aws:s3:::bucket-name/*), not an EC2 resource. If the ARN is for EC2, the policy will not apply to S3 operations, causing the EC2 instance to be denied access regardless of the VPC endpoint condition. S3 bucket policies only take effect when the Resource element specifies the S3 bucket ARN.
What should I do if I get this SCS-C02 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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