This DOP-C02 practice question tests your understanding of monitoring and logging. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is running a production microservices architecture on Amazon ECS with Fargate. The operations team wants to set up centralized logging across all services, including the ability to search logs in near real-time and retain them for 3 years. The logs are currently sent to CloudWatch Logs. Which combination of services would meet these requirements with the least operational overhead?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set a retention policy of 3 years on the CloudWatch Logs log groups and use CloudWatch Logs Insights for searching.
Option C is correct because CloudWatch Logs provides near real-time search and can set retention to 3 years. Option A is wrong because S3 + Athena is not real-time and adds complexity. Option B is wrong because Elasticsearch Service adds operational overhead. Option D is wrong because Firehose to S3 alone lacks search capability.
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
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Stream logs to Amazon OpenSearch Service (Elasticsearch) using a CloudWatch Logs subscription filter.
Set a retention policy of 3 years on the CloudWatch Logs log groups and use CloudWatch Logs Insights for searching.
Why this is correct
CloudWatch Logs Insights provides near real-time querying and retention policies are straightforward.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Export logs to Amazon S3 and use Amazon Athena to query them.
Why it's wrong here
Not near real-time; adds query latency and cost.
✗
Use Amazon Kinesis Data Firehose to deliver logs to Amazon S3 with a 3-year lifecycle policy.
Why it's wrong here
No built-in search; would need additional service like Athena, adding complexity.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
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
How to think about this question
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.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
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
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 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 — This question tests Monitoring and Logging — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Set a retention policy of 3 years on the CloudWatch Logs log groups and use CloudWatch Logs Insights for searching. — Option C is correct because CloudWatch Logs provides near real-time search and can set retention to 3 years. Option A is wrong because S3 + Athena is not real-time and adds complexity. Option B is wrong because Elasticsearch Service adds operational overhead. Option D is wrong because Firehose to S3 alone lacks search capability.
What should I do if I get this DOP-C02 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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