← DOP-C02·Amazon Web Services

Question 254 of 1,740

SDLC Automation →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is to configure the deployment group for automatic rollback on failure and then manually trigger a rollback. This is correct because in a Blue/Green deployment, CodeDeploy maintains the original (blue) environment as a separate Auto Scaling group; when you trigger a rollback after a successful deployment, CodeDeploy re-routes traffic from the faulty green environment back to the healthy blue environment, effectively undoing the traffic shift without redeploying code. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding that a "successful" deployment in CodeDeploy means the lifecycle hooks completed, but the application can still be broken—the trap is thinking you must redeploy or stop the deployment, when the built-in rollback mechanism is the intended solution. Remember the key distinction: automatic rollback is configured for deployment failures, but you can manually invoke it anytime to restore the previous environment. Memory tip: "Green fails, Blue sails—trigger the rollback, don't re-ship the rails."

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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 is using AWS CodeDeploy to deploy a web application to an Auto Scaling group of Amazon EC2 instances. The deployment strategy is Blue/Green. After a successful deployment, the team notices that the new instances are receiving traffic but the application returns errors. The old instances are still serving traffic correctly. The team wants to roll back immediately. What should be done?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

Question 1hardmultiple choice

Full question →

A
Stop the current deployment using the AWS CLI.
Why wrong: Stopping the deployment does not reroute traffic; the green environment remains active.
B
Manually update the Auto Scaling group to associate new instances with the old launch configuration.
Why wrong: This would not reroute traffic; you would need to modify the load balancer target groups, which is more complex than using CodeDeploy rollback.
C
Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback.
CodeDeploy supports automatic rollback; triggering a rollback will reroute traffic back to the blue environment.
D
Redeploy the same application revision to the same Auto Scaling group.
Why wrong: Redeploying the same revision would not fix the errors; it would repeat the same faulty deployment.

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

✓

Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback.

Option B is correct because in a Blue/Green deployment, CodeDeploy can automatically roll back by re-routing traffic to the original (blue) environment if a deployment fails. Option A is wrong because redeploying the same revision would redeploy the faulty code. Option C is wrong because stopping the deployment terminates the process but does not restore traffic to the old instances. Option D is wrong because while you could manually reassociate instances, CodeDeploy provides a built-in rollback mechanism.

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.

✗
Stop the current deployment using the AWS CLI.
Why it's wrong here
Stopping the deployment does not reroute traffic; the green environment remains active.
✗
Manually update the Auto Scaling group to associate new instances with the old launch configuration.
Why it's wrong here
This would not reroute traffic; you would need to modify the load balancer target groups, which is more complex than using CodeDeploy rollback.
✓
Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback.
Why this is correct
CodeDeploy supports automatic rollback; triggering a rollback will reroute traffic back to the blue environment.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Redeploy the same application revision to the same Auto Scaling group.
Why it's wrong here
Redeploying the same revision would not fix the errors; it would repeat the same faulty deployment.

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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

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?

SDLC Automation — This question tests SDLC Automation — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Configure the deployment group to automatically roll back when a deployment fails, then manually trigger a rollback. — Option B is correct because in a Blue/Green deployment, CodeDeploy can automatically roll back by re-routing traffic to the original (blue) environment if a deployment fails. Option A is wrong because redeploying the same revision would redeploy the faulty code. Option C is wrong because stopping the deployment terminates the process but does not restore traffic to the old instances. Option D is wrong because while you could manually reassociate instances, CodeDeploy provides a built-in rollback mechanism.

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

Are there clue words in this question I should notice?

Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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