SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. A security engineer is reviewing an S3 bucket policy. The policy is intended to allow read access to objects in the bucket only from the corporate network (203.0.113.0/24). However, users outside the network can still 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.
The bucket policy does not include an explicit Deny statement for IP addresses outside the allowed range.
Without an explicit Deny, the Allow applies only to the specified IP, but other users might be denied by default if no other policies allow them. However, if users have IAM permissions, they could access from any IP. The policy should include a Deny to restrict.
B
The s3:GetObject action is misspelled; it should be s3:GetObjectVersion.
Why wrong: s3:GetObject is correct.
C
The condition key should be aws:SourceIp instead of aws:SourceIp.
Why wrong: The condition key is correct as shown.
D
The bucket policy must be attached to the bucket's ACL instead.
Why wrong: Bucket policies are evaluated; ACLs are separate.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The bucket policy does not include an explicit Deny statement for IP addresses outside the allowed range.
The bucket policy alone is not sufficient; the bucket must also block public access. A bucket policy that grants access to a specific IP range still allows access to anyone who can satisfy the condition. However, if the bucket's block public access settings are not configured, anonymous users could bypass the policy? Actually, the policy allows access only from that IP, but if the bucket is not public, only authorized IAM users can access. The issue could be that the policy doesn't deny access from other IPs. The correct answer is that the policy allows access but does not explicitly deny access from other IPs. A more correct policy would include a Deny statement. The other options: Users are using pre-signed URLs would bypass IP restriction. The bucket policy has a typo? The resource is correct. The condition key is correct. The most likely reason is that the policy allows access but does not deny access from other IPs. However, among the options, the best is that the policy does not include an explicit Deny for other IPs.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 bucket policy does not include an explicit Deny statement for IP addresses outside the allowed range.
Why this is correct
Without an explicit Deny, the Allow applies only to the specified IP, but other users might be denied by default if no other policies allow them. However, if users have IAM permissions, they could access from any IP. The policy should include a Deny to restrict.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The s3:GetObject action is misspelled; it should be s3:GetObjectVersion.
Why it's wrong here
s3:GetObject is correct.
✗
The condition key should be aws:SourceIp instead of aws:SourceIp.
Why it's wrong here
The condition key is correct as shown.
✗
The bucket policy must be attached to the bucket's ACL instead.
Why it's wrong here
Bucket policies are evaluated; ACLs are separate.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
The condition key is correct as shown.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The bucket policy does not include an explicit Deny statement for IP addresses outside the allowed range. — The bucket policy alone is not sufficient; the bucket must also block public access. A bucket policy that grants access to a specific IP range still allows access to anyone who can satisfy the condition. However, if the bucket's block public access settings are not configured, anonymous users could bypass the policy? Actually, the policy allows access only from that IP, but if the bucket is not public, only authorized IAM users can access. The issue could be that the policy doesn't deny access from other IPs. The correct answer is that the policy allows access but does not explicitly deny access from other IPs. A more correct policy would include a Deny statement. The other options: Users are using pre-signed URLs would bypass IP restriction. The bucket policy has a typo? The resource is correct. The condition key is correct. The most likely reason is that the policy allows access but does not deny access from other IPs. However, among the options, the best is that the policy does not include an explicit Deny for other IPs.
What should I do if I get this SCS-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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