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Question 1,347 of 1,740

Monitoring and Logging →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to create a CloudWatch alarm on the CloudFormation stack event metric for UPDATE_FAILED and configure an SNS topic to send email notifications. This works because CloudFormation emits stack-level events as metrics to CloudWatch, allowing you to set an alarm that triggers specifically when an update fails, and SNS then delivers the alert via email or other protocols. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this tests your understanding of native monitoring integrations versus over-engineered solutions—a common trap is reaching for Lambda or EventBridge when a simple CloudWatch alarm on the stack event metric is the most direct path for a CloudFormation stack update failure notification. Remember that CloudWatch alarms can directly consume CloudFormation’s built-in event metrics without custom code, making the combination of CloudWatch and SNS the simplest and most reliable approach. Memory tip: “Alarm the event, SNS the message”—if you can alarm on the metric, you don’t need a middleman.

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 DevOps team uses AWS CloudFormation to deploy a web application. They want to receive notifications when a stack update fails. Which combination of services should they use?

Question 1mediummultiple choice

Read the full NAT/PAT explanation →

A
Use AWS Config rules to monitor stack status and trigger an SNS notification.
Why wrong: AWS Config evaluates resource configurations, not stack update events.
B
Create a CloudWatch alarm on the CloudFormation stack event metric 'UPDATE_FAILED' and configure an SNS topic to send email notifications.
CloudWatch alarms can monitor stack events and trigger SNS notifications directly.
C
Use Amazon EventBridge to capture CloudFormation events and invoke an AWS Lambda function that sends an email.
Why wrong: EventBridge with Lambda is possible but more complex than the native alarm approach.
D
Enable S3 event notifications on the CloudFormation template bucket and subscribe an SNS topic.
Why wrong: S3 events are not related to CloudFormation stack update states.

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

✓

Create a CloudWatch alarm on the CloudFormation stack event metric 'UPDATE_FAILED' and configure an SNS topic to send email notifications.

Option B is correct because you can create a CloudWatch alarm on the 'Stack Events' metric for 'UPDATE_FAILED' and send notifications via SNS. Option A is wrong because Lambda cannot directly receive CloudFormation events without a custom integration. Option C is wrong because EventBridge can capture CloudFormation events, but the question asks for notifications; the simplest approach is CloudWatch Alarm + SNS. Option D is wrong because S3 does not trigger on stack events by default.

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 AWS Config rules to monitor stack status and trigger an SNS notification.
Why it's wrong here
AWS Config evaluates resource configurations, not stack update events.
✓
Create a CloudWatch alarm on the CloudFormation stack event metric 'UPDATE_FAILED' and configure an SNS topic to send email notifications.
Why this is correct
CloudWatch alarms can monitor stack events and trigger SNS notifications directly.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Amazon EventBridge to capture CloudFormation events and invoke an AWS Lambda function that sends an email.
Why it's wrong here
EventBridge with Lambda is possible but more complex than the native alarm approach.
✗
Enable S3 event notifications on the CloudFormation template bucket and subscribe an SNS topic.
Why it's wrong here
S3 events are not related to CloudFormation stack update states.

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: Create a CloudWatch alarm on the CloudFormation stack event metric 'UPDATE_FAILED' and configure an SNS topic to send email notifications. — Option B is correct because you can create a CloudWatch alarm on the 'Stack Events' metric for 'UPDATE_FAILED' and send notifications via SNS. Option A is wrong because Lambda cannot directly receive CloudFormation events without a custom integration. Option C is wrong because EventBridge can capture CloudFormation events, but the question asks for notifications; the simplest approach is CloudWatch Alarm + SNS. Option D is wrong because S3 does not trigger on stack events by default.

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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