← SOA-C02·Amazon Web Services

Question 740 of 1,546

Networking and Content Delivery →hardMultiple ChoiceObjective-mapped

SOA-C02 Networking and Content Delivery Practice Question

This SOA-C02 practice question tests your understanding of networking and content delivery. 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.

A company is using Amazon CloudFront with an S3 bucket as the origin. The S3 bucket contains sensitive data that should only be accessible via CloudFront. The SysOps administrator has configured an Origin Access Identity (OAI) and updated the bucket policy to allow access only to the OAI. However, users are still able to access the S3 bucket directly via the S3 URL. 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.

A
The bucket policy does not include a condition to require the OAI.
Why wrong: The OAI works by specifying the OAI as the principal in the bucket policy; a condition is not required.
B
The bucket policy allows public read access in addition to the OAI access.
If the bucket policy grants public read access (e.g., Principal: "*"), users can bypass CloudFront and access the bucket directly. The policy should only allow the OAI and deny all others.
C
The OAI is not properly associated with the CloudFront distribution.
Why wrong: The administrator has configured the OAI, so it is likely associated correctly.
D
The S3 bucket is configured as a static website.
Why wrong: Static website hosting does not bypass OAI; the OAI still applies.

Full breakdown with real-world context →

Answer choices

Why each option matters

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 allows public read access in addition to the OAI access.

Option B is correct. The most likely reason users can still access the S3 bucket directly is that the bucket policy allows public read access in addition to the Origin Access Identity (OAI) access. Even though the OAI restricts CloudFront access, if the bucket policy also grants public read access, users can bypass CloudFront and access the bucket directly via its S3 URL. For the OAI to effectively prevent direct access, the bucket policy must deny all principals except the OAI. Option A is incorrect because requiring the OAI via a condition is not the issue; the policy must explicitly deny other access. Option C is incorrect because if the OAI were not properly associated, CloudFront would fail to access the bucket, but the problem is that users can still access the bucket directly. Option D is incorrect because configuring the bucket as a static website does not inherently allow direct access; the bucket policy still governs access.

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 a condition to require the OAI.
Why it's wrong here
The OAI works by specifying the OAI as the principal in the bucket policy; a condition is not required.
✓
The bucket policy allows public read access in addition to the OAI access.
Why this is correct
If the bucket policy grants public read access (e.g., Principal: "*"), users can bypass CloudFront and access the bucket directly. The policy should only allow the OAI and deny all others.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The OAI is not properly associated with the CloudFront distribution.
Why it's wrong here
The administrator has configured the OAI, so it is likely associated correctly.
✗
The S3 bucket is configured as a static website.
Why it's wrong here
Static website hosting does not bypass OAI; the OAI still applies.

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.

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.

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.

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 SOA-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this SOA-C02 question test?

Networking and Content Delivery — This question tests Networking and Content Delivery — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The bucket policy allows public read access in addition to the OAI access. — Option B is correct. The most likely reason users can still access the S3 bucket directly is that the bucket policy allows public read access in addition to the Origin Access Identity (OAI) access. Even though the OAI restricts CloudFront access, if the bucket policy also grants public read access, users can bypass CloudFront and access the bucket directly via its S3 URL. For the OAI to effectively prevent direct access, the bucket policy must deny all principals except the OAI. Option A is incorrect because requiring the OAI via a condition is not the issue; the policy must explicitly deny other access. Option C is incorrect because if the OAI were not properly associated, CloudFront would fail to access the bucket, but the problem is that users can still access the bucket directly. Option D is incorrect because configuring the bucket as a static website does not inherently allow direct access; the bucket policy still governs access.

What should I do if I get this SOA-C02 question wrong?

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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