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Question 250 of 1,616

Deployment →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is a blue/green deployment strategy, which involves creating a separate 'green' Elastic Beanstalk environment with the new application version, running thorough tests against it, and then swapping the environment URLs (CNAME records) so production traffic instantly points to the green environment. This achieves zero downtime because the swap is instantaneous and the original 'blue' environment remains untouched until the switch occurs, allowing you to roll back immediately if needed. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of deployment strategies that prioritize safety and testing—a common trap is confusing blue/green with rolling deployments, which update instances incrementally and don’t offer a separate test environment. Remember the key distinction: blue/green is about environment-level swapping, not instance-level updates. Memory tip: think “swap, not step”—you swap entire environments rather than stepping through instances.

DVA-C02 Deployment Practice Question

This DVA-C02 practice question tests your understanding of deployment. 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 company runs a web application on AWS Elastic Beanstalk. The application currently runs in a single environment. The developer wants to deploy a new version with zero downtime and be able to test the new version thoroughly before it receives any production traffic. Which deployment strategy should the developer use?

Question 1mediummultiple choice

Full question →

A
Perform a rolling deployment with a batch size of one instance at a time.
Why wrong: Rolling deployments update instances in the current environment gradually, but there is no separate environment for testing. The new version starts serving traffic immediately on updated instances.
B
Use an immutable deployment to launch a new set of instances and then swap the Auto Scaling group.
Why wrong: Immutable deployments replace all instances with new ones but still occur within the same environment. The new version receives traffic immediately after health checks pass, with no testing phase.
C
Create a new environment (green) with the new version, run tests against it, and then swap the environment URLs so that production points to the green environment.
This is the blue/green deployment strategy. The green environment is isolated for testing. Swapping the CNAME from the blue environment to the green environment provides zero downtime and full testing.
D
Use a rolling deployment with additional batch to launch new instances before terminating old ones.
Why wrong: This is a variant of rolling deployment that still forces the new version to serve traffic immediately after instances are updated. It does not provide a separate testing environment.

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 new environment (green) with the new version, run tests against it, and then swap the environment URLs so that production points to the green environment.

Option C is correct because it describes a blue/green deployment strategy, which creates a separate 'green' environment with the new application version, allowing thorough testing before swapping the environment URLs (CNAME records) in Elastic Beanstalk. This ensures zero downtime because the swap is instantaneous and the original 'blue' environment remains untouched until the swap occurs.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Perform a rolling deployment with a batch size of one instance at a time.
Why it's wrong here
Rolling deployments update instances in the current environment gradually, but there is no separate environment for testing. The new version starts serving traffic immediately on updated instances.
✗
Use an immutable deployment to launch a new set of instances and then swap the Auto Scaling group.
Why it's wrong here
Immutable deployments replace all instances with new ones but still occur within the same environment. The new version receives traffic immediately after health checks pass, with no testing phase.
✓
Create a new environment (green) with the new version, run tests against it, and then swap the environment URLs so that production points to the green environment.
Why this is correct
This is the blue/green deployment strategy. The green environment is isolated for testing. Swapping the CNAME from the blue environment to the green environment provides zero downtime and full testing.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a rolling deployment with additional batch to launch new instances before terminating old ones.
Why it's wrong here
This is a variant of rolling deployment that still forces the new version to serve traffic immediately after instances are updated. It does not provide a separate testing environment.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse immutable deployments (which replace instances but not the environment) with blue/green deployments (which replace the entire environment), leading them to choose Option B because both involve launching new instances, but only blue/green allows pre-production testing without traffic exposure.

Detailed technical explanation

How to think about this question

In Elastic Beanstalk, a blue/green deployment is implemented by creating a second environment (green) with the new application version, then performing a CNAME swap at the DNS level to redirect traffic from the blue environment to the green environment. This swap is typically instantaneous and does not require DNS propagation delays because Elastic Beanstalk uses Route 53 alias records or Elastic Load Balancing DNS names that can be updated atomically. A real-world scenario where this matters is when the new version introduces breaking API changes or database schema migrations that must be validated in isolation before exposing them to users.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Create a new environment (green) with the new version, run tests against it, and then swap the environment URLs so that production points to the green environment. — Option C is correct because it describes a blue/green deployment strategy, which creates a separate 'green' environment with the new application version, allowing thorough testing before swapping the environment URLs (CNAME records) in Elastic Beanstalk. This ensures zero downtime because the swap is instantaneous and the original 'blue' environment remains untouched until the swap occurs.

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

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DVA-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 DVA-C02 exam.