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Infrastructure SecurityhardMultiple ChoiceObjective-mapped

SCS-C02 Infrastructure Security Practice Question

This SCS-C02 practice question tests your understanding of infrastructure security. 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.

Exhibit

Resources:
  MyBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: my-sensitive-data
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
        IgnorePublicAcls: true
        RestrictPublicBuckets: true
      BucketPolicy:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal: "*"
            Action: s3:GetObject
            Resource: arn:aws:s3:::my-sensitive-data/*
            Condition:
              IpAddress:
                aws:SourceIp: "203.0.113.0/24"

Refer to the exhibit. A security engineer reviews this CloudFormation template. Which statement about the bucket's public accessibility is correct?

Exhibit

Resources:
  MyBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: my-sensitive-data
      PublicAccessBlockConfiguration:
        BlockPublicAcls: true
        BlockPublicPolicy: true
        IgnorePublicAcls: true
        RestrictPublicBuckets: true
      BucketPolicy:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal: "*"
            Action: s3:GetObject
            Resource: arn:aws:s3:::my-sensitive-data/*
            Condition:
              IpAddress:
                aws:SourceIp: "203.0.113.0/24"

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 is private because PublicAccessBlockConfiguration blocks all public access.

The PublicAccessBlockConfiguration blocks all public access settings, including bucket policies that grant public access. Even though the bucket policy allows GetObject from a specific IP range, the RestrictPublicBuckets setting overrides the policy, effectively blocking all public 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 is public because the bucket policy allows GetObject.

    Why it's wrong here

    PublicAccessBlockConfiguration overrides the policy.

  • The bucket is public only for IPs in the 203.0.113.0/24 range.

    Why it's wrong here

    PublicAccessBlockConfiguration prevents any public access.

  • The bucket is private because no ACLs allow public access.

    Why it's wrong here

    The policy would grant access, but the block settings prevent it.

  • The bucket is private because PublicAccessBlockConfiguration blocks all public access.

    Why this is correct

    Correct. The settings block public access regardless of the policy.

    Related concept

    Standard ACLs match source addresses.

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.

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.

Related practice questions

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FAQ

Questions learners often ask

What does this SCS-C02 question test?

Infrastructure Security — This question tests Infrastructure Security — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The bucket is private because PublicAccessBlockConfiguration blocks all public access. — The PublicAccessBlockConfiguration blocks all public access settings, including bucket policies that grant public access. Even though the bucket policy allows GetObject from a specific IP range, the RestrictPublicBuckets setting overrides the policy, effectively blocking all public access.

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.

What is the key concept behind this question?

Standard ACLs match source addresses.

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Last reviewed: Jul 4, 2026

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