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Question 1,382 of 1,750

Monitoring and Logging →hardMultiple ChoiceObjective-mapped

DOP-C02 Monitoring and Logging Practice Question

This DOP-C02 practice question tests your understanding of monitoring and logging. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 DevOps engineer is tasked with centralizing logs from multiple AWS accounts into a single Amazon OpenSearch Service domain. The engineer sets up Amazon Kinesis Data Firehose to deliver logs from each account to the OpenSearch domain. However, some accounts show failed deliveries in the Firehose console. Which configuration is MOST likely causing the failures?

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 IAM role assumed by Firehose in each account does not have permissions to write to the cross-account OpenSearch domain
Firehose needs an IAM role with sts:AssumeRole and es:HttpPut permissions for the destination OpenSearch domain.
B
The source accounts do not have a CloudWatch Logs subscription filter to send logs to Firehose
Why wrong: Logs can be sent to Firehose directly, not necessarily via CloudWatch subscription.
C
The Kinesis Data Streams used as the Firehose source is not encrypted
Why wrong: Encryption is not required for Firehose delivery.
D
The OpenSearch domain's access policy does not allow access from the S3 bucket used by Firehose
Why wrong: Firehose delivers directly to OpenSearch, not via S3.

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 IAM role assumed by Firehose in each account does not have permissions to write to the cross-account OpenSearch domain

The most likely cause of failed deliveries is that the IAM role assumed by Kinesis Data Firehose in each source account lacks the necessary permissions to write to the cross-account Amazon OpenSearch Service domain. Firehose uses a service-linked or custom IAM role to perform actions such as `es:ESHttpPut` and `es:ESHttpPost` against the OpenSearch domain endpoint. Without explicit cross-account trust and resource-based policy allowing the Firehose role's ARN, the delivery will fail with an authorization error.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 role assumed by Firehose in each account does not have permissions to write to the cross-account OpenSearch domain
Why this is correct
Firehose needs an IAM role with sts:AssumeRole and es:HttpPut permissions for the destination OpenSearch domain.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The source accounts do not have a CloudWatch Logs subscription filter to send logs to Firehose
Why it's wrong here
Logs can be sent to Firehose directly, not necessarily via CloudWatch subscription.
✗
The Kinesis Data Streams used as the Firehose source is not encrypted
Why it's wrong here
Encryption is not required for Firehose delivery.
✗
The OpenSearch domain's access policy does not allow access from the S3 bucket used by Firehose
Why it's wrong here
Firehose delivers directly to OpenSearch, not via S3.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume the failure is due to missing CloudWatch subscription filters or S3 bucket permissions, but the real issue is the missing cross-account IAM trust between the Firehose role and the OpenSearch domain's access policy.

Detailed technical explanation

How to think about this question

Under the hood, Firehose uses the `es:ESHttpPut` action to index documents into OpenSearch, and the domain's access policy must include a statement that allows the Firehose IAM role's ARN (or the source account's root principal) to perform that action. Additionally, the OpenSearch domain must be configured with a fine-grained access control or a resource-based policy that explicitly trusts the source account; otherwise, even with correct IAM roles, cross-account delivery will fail with a 403 Forbidden response. A common real-world scenario is when the domain's access policy uses a condition key like `aws:SourceArn` or `aws:SourceAccount` to restrict access, but the Firehose role's ARN is not included in the allowed principals.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The IAM role assumed by Firehose in each account does not have permissions to write to the cross-account OpenSearch domain — The most likely cause of failed deliveries is that the IAM role assumed by Kinesis Data Firehose in each source account lacks the necessary permissions to write to the cross-account Amazon OpenSearch Service domain. Firehose uses a service-linked or custom IAM role to perform actions such as `es:ESHttpPut` and `es:ESHttpPost` against the OpenSearch domain endpoint. Without explicit cross-account trust and resource-based policy allowing the Firehose role's ARN, the delivery will fail with an authorization error.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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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.