Quick Answer
The answer is Amazon CloudWatch Logs, Amazon Kinesis Data Firehose, and Amazon OpenSearch Service. This trio works together to form a cost-effective centralized logging multi-account AWS architecture: CloudWatch Logs aggregates logs from all accounts, Kinesis Data Firehose streams that data in near-real-time to a durable destination, and OpenSearch Service provides the real-time log analysis and visualization layer. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your ability to distinguish between storage, ingestion, and analysis services—a common trap is choosing Amazon S3 for real-time analysis or Amazon CloudTrail for general logging. Remember that CloudTrail captures only API activity, not application or system logs, and S3 is a storage sink, not an analysis engine. A useful memory tip is to think of the pipeline as "Collect, Stream, Analyze"—CloudWatch Logs collects, Firehose streams, and OpenSearch analyzes.
This DOP-C02 practice question tests your understanding of monitoring and logging. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 designing a centralized logging solution for a multi-account AWS environment. The solution must be cost-effective and provide real-time log analysis. Which THREE services should they consider?
Amazon OpenSearch Service (Elasticsearch)
Provides real-time log search and analysis.
Amazon Kinesis Data Firehose
Streams logs to destinations for analysis.
Amazon S3
Why wrong: S3 is for log storage, not real-time analysis.
Amazon CloudWatch Logs
Centralized log collection from multiple accounts.
AWS CloudTrail
Why wrong: CloudTrail is limited to API activity logs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon OpenSearch Service (Elasticsearch)
Option A is correct because CloudWatch Logs can collect logs from various sources. Option C is correct because Kinesis Data Firehose can stream logs to destinations like S3 or Elasticsearch. Option E is correct because Amazon OpenSearch Service can be used for log analysis. Option B is wrong because S3 is for storage, not real-time analysis. Option D is wrong because CloudTrail is for API logs only.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Amazon OpenSearch Service (Elasticsearch)
Why this is correct
Provides real-time log search and analysis.
Related concept
Static NAT maps one inside address to one outside address.
Amazon Kinesis Data Firehose
Why this is correct
Streams logs to destinations for analysis.
Related concept
Static NAT maps one inside address to one outside address.
Amazon S3
Why it's wrong here
S3 is for log storage, not real-time analysis.
Amazon CloudWatch Logs
Why this is correct
Centralized log collection from multiple accounts.
Related concept
Static NAT maps one inside address to one outside address.
AWS CloudTrail
Why it's wrong here
CloudTrail is limited to API activity logs.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
Monitoring and Logging — study guide chapter
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Monitoring and Logging practice questions
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FAQ
Monitoring and Logging — This question tests Monitoring and Logging — Static NAT maps one inside address to one outside address..
The correct answer is: Amazon OpenSearch Service (Elasticsearch) — Option A is correct because CloudWatch Logs can collect logs from various sources. Option C is correct because Kinesis Data Firehose can stream logs to destinations like S3 or Elasticsearch. Option E is correct because Amazon OpenSearch Service can be used for log analysis. Option B is wrong because S3 is for storage, not real-time analysis. Option D is wrong because CloudTrail is for API logs only.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
About these practice questions
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company wants to set up centralized logging for its multi-account AWS environment. The logs include CloudTrail, VPC Flow Logs, and Amazon Route 53 resolver query logs. Which TWO services should they use to achieve this with minimal operational overhead? (Select TWO.)
mediumWhy A: Option A (CloudWatch Logs) and Option C (S3) are correct because CloudWatch Logs can receive logs from multiple accounts via subscription filters, and S3 can serve as a central archive. Option B is wrong because Kinesis is not needed as an intermediate. Option D is wrong because OpenSearch adds overhead. Option E is wrong because CloudTrail alone cannot centralize all log types.
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Last reviewed: Jun 20, 2026
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.
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