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Troubleshooting and Optimization →hardMultiple ChoiceObjective-mapped

DVA-C02 Troubleshooting and Optimization Practice Question

This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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.

Exhibit

Refer to the exhibit.
```json
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject"
      ],
      "Resource": "arn:aws:s3:::my-bucket/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket"
      ],
      "Resource": "arn:aws:s3:::my-bucket"
    }
  ]
}
```

A developer has attached the IAM policy shown in the exhibit to a user. The user reports that they can upload and delete objects in the bucket 'my-bucket', but cannot list the objects in 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.
```json
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject"
      ],
      "Resource": "arn:aws:s3:::my-bucket/*"
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket"
      ],
      "Resource": "arn:aws:s3:::my-bucket"
    }
  ]
}
```

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 has a bucket policy that denies s3:ListBucket.

The IAM policy provides s3:ListBucket permission on the bucket, so the user should be able to list objects. However, bucket policies can explicitly deny actions, and an explicit deny overrides any allow. Therefore, the most likely reason is that the bucket policy denies s3:ListBucket. Option A is incorrect because s3:GetObject is for reading individual objects, not listing. Option C is incorrect because the API call version does not affect permissions. Option D is incorrect because region does not affect IAM permissions.

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 IAM policy is missing the s3:GetObject permission for listing.

    Why it's wrong here

    Listing objects requires s3:ListBucket, not s3:GetObject.

  • ✓

    The bucket has a bucket policy that denies s3:ListBucket.

    Why this is correct

    An explicit deny in a bucket policy overrides an allow from an IAM policy.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Standard ACLs match source addresses.

  • ✗

    The user is using the ListObjectsV2 API call instead of ListObjects.

    Why it's wrong here

    Both API calls require the same s3:ListBucket permission.

  • ✗

    The bucket is in a different region than the default region configured in the AWS CLI.

    Why it's wrong here

    Region does not affect IAM permissions.

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 ClassMin DurationRetrievalUse Case
S3 StandardNoneImmediateFrequently accessed data
S3 Standard-IA30 daysImmediateInfrequent access, rapid retrieval
S3 One Zone-IA30 daysImmediateNon-critical infrequent data
S3 Intelligent-TieringNoneImmediate–hoursUnknown or changing access patterns
S3 Glacier Instant90 daysMillisecondsArchive with instant retrieval
S3 Glacier Flexible90 daysMinutes–hoursArchive, flexible retrieval
S3 Glacier Deep Archive180 daysHoursLong-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 DVA-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The bucket has a bucket policy that denies s3:ListBucket. — The IAM policy provides s3:ListBucket permission on the bucket, so the user should be able to list objects. However, bucket policies can explicitly deny actions, and an explicit deny overrides any allow. Therefore, the most likely reason is that the bucket policy denies s3:ListBucket. Option A is incorrect because s3:GetObject is for reading individual objects, not listing. Option C is incorrect because the API call version does not affect permissions. Option D is incorrect because region does not affect IAM permissions.

What should I do if I get this DVA-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 DVA-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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Last reviewed: Jun 20, 2026

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