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Incident and Event Response →hardMultiple ChoiceObjective-mapped

DOP-C02 Incident and Event Response Practice Question

This DOP-C02 practice question tests your understanding of incident and event 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.

Exhibit

Refer to the exhibit.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::my-bucket/*",
      "Condition": {
        "StringEquals": {
          "s3:x-amz-server-side-encryption": "AES256"
        }
      }
    },
    {
      "Effect": "Deny",
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::my-bucket/*",
      "Condition": {
        "StringNotEquals": {
          "s3:x-amz-server-side-encryption": "AES256"
        }
      }
    }
  ]
}

A DevOps team applies the above IAM policy to a group. A developer in this group tries to upload an object to the S3 bucket using the AWS CLI without specifying any encryption. The upload fails with an AccessDenied error. Why does the upload fail?

Question 1hardmultiple choice
Full question →

Exhibit

Refer to the exhibit.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::my-bucket/*",
      "Condition": {
        "StringEquals": {
          "s3:x-amz-server-side-encryption": "AES256"
        }
      }
    },
    {
      "Effect": "Deny",
      "Action": "s3:PutObject",
      "Resource": "arn:aws:s3:::my-bucket/*",
      "Condition": {
        "StringNotEquals": {
          "s3:x-amz-server-side-encryption": "AES256"
        }
      }
    }
  ]
}

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 Deny statement explicitly denies PutObject when encryption is not AES256, overriding the Allow.

Option A is correct because the Deny statement explicitly denies PutObject if encryption is not AES256. The Allow statement only allows if AES256 is specified. Since no encryption is specified, the condition in the Deny statement (StringNotEquals AES256) is true, causing a deny. Option B is wrong because the Allow statement's condition is not met, so it does not grant permission. Option C is wrong because the Deny statement explicitly matches the condition. Option D is wrong because explicit Deny overrides Allow.

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 Allow statement's condition is satisfied, but the Deny statement is evaluated first and denies the request.

    Why it's wrong here

    Evaluation order does not matter; explicit Deny wins regardless.

  • ✗

    The Allow statement requires encryption to be AES256, but the CLI defaults to SSE-S3, which is not AES256.

    Why it's wrong here

    The CLI does not default to SSE-S3; it sends no encryption header.

  • ✓

    The Deny statement explicitly denies PutObject when encryption is not AES256, overriding the Allow.

    Why this is correct

    Explicit Deny always overrides Allow.

    Related concept

    Standard ACLs match source addresses.

  • ✗

    The Deny statement's condition is not met because the request does not include encryption headers.

    Why it's wrong here

    The condition 'StringNotEquals' evaluates true when no encryption header is present, so Deny 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.

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 DOP-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Incident and Event Response — This question tests Incident and Event Response — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The Deny statement explicitly denies PutObject when encryption is not AES256, overriding the Allow. — Option A is correct because the Deny statement explicitly denies PutObject if encryption is not AES256. The Allow statement only allows if AES256 is specified. Since no encryption is specified, the condition in the Deny statement (StringNotEquals AES256) is true, causing a deny. Option B is wrong because the Allow statement's condition is not met, so it does not grant permission. Option C is wrong because the Deny statement explicitly matches the condition. Option D is wrong because explicit Deny overrides Allow.

What should I do if I get this DOP-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 DOP-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: Jun 20, 2026

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This DOP-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DOP-C02 exam.