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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. 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.

A company uses AWS CloudTrail to log all API calls across multiple accounts in AWS Organizations. The DevOps team wants to detect and alert on any IAM user who creates an access key and then uses it to make API calls within 24 hours, as this may indicate a compromised account. Which combination of actions should be taken to achieve this with minimal latency?

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

A
Use Amazon Athena to query CloudTrail logs in S3 every hour and send alerts for matches.
Why wrong: Hourly queries may miss the 24-hour window and are not real-time.
B
Create an Amazon EventBridge rule that matches CreateAccessKey and any subsequent API call from the same user within 24 hours.
Why wrong: EventBridge rules cannot correlate events across time windows natively.
C
Stream CloudTrail logs to CloudWatch Logs and create a metric filter to detect the pattern, then set an alarm.
Why wrong: Metric filters cannot correlate two separate events across time.
D
Enable S3 Event Notifications on the CloudTrail S3 bucket to invoke a Lambda function that processes new log files and checks for the pattern.
Allows near-real-time processing with minimal latency.

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

✓

Enable S3 Event Notifications on the CloudTrail S3 bucket to invoke a Lambda function that processes new log files and checks for the pattern.

Option D is correct because CloudTrail delivers logs to S3 within about 15 minutes; using S3 Events to trigger a Lambda that analyzes the logs in near-real-time allows detection within the 24-hour window. Option A is wrong because CloudWatch Logs Insights queries are not real-time and require logs to be streamed to CloudWatch Logs, which adds latency. Option B is wrong because Athena is not real-time. Option C is wrong because EventBridge can detect API calls but cannot correlate the creation of a key with its subsequent use in a single rule; it would require complex pattern matching.

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.

✗
Use Amazon Athena to query CloudTrail logs in S3 every hour and send alerts for matches.
Why it's wrong here
Hourly queries may miss the 24-hour window and are not real-time.
✗
Create an Amazon EventBridge rule that matches CreateAccessKey and any subsequent API call from the same user within 24 hours.
Why it's wrong here
EventBridge rules cannot correlate events across time windows natively.
✗
Stream CloudTrail logs to CloudWatch Logs and create a metric filter to detect the pattern, then set an alarm.
Why it's wrong here
Metric filters cannot correlate two separate events across time.
✓
Enable S3 Event Notifications on the CloudTrail S3 bucket to invoke a Lambda function that processes new log files and checks for the pattern.
Why this is correct
Allows near-real-time processing with minimal latency.
Related concept
Static NAT maps one inside address to one outside address.

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.

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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 — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Enable S3 Event Notifications on the CloudTrail S3 bucket to invoke a Lambda function that processes new log files and checks for the pattern. — Option D is correct because CloudTrail delivers logs to S3 within about 15 minutes; using S3 Events to trigger a Lambda that analyzes the logs in near-real-time allows detection within the 24-hour window. Option A is wrong because CloudWatch Logs Insights queries are not real-time and require logs to be streamed to CloudWatch Logs, which adds latency. Option B is wrong because Athena is not real-time. Option C is wrong because EventBridge can detect API calls but cannot correlate the creation of a key with its subsequent use in a single rule; it would require complex pattern matching.

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

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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