The answer is to implement a blue/green deployment with an Application Load Balancer, configure the ECS service with a health check grace period, and enable ECS service auto scaling. These three strategies work together to ensure zero-downtime deployments by routing traffic to a new task set only after health checks pass, giving new tasks time to stabilize before the old ones are terminated, and maintaining sufficient capacity to absorb traffic shifts. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of how ECS integrates with CodePipeline and load balancers to achieve continuous delivery without service interruption. A common trap is selecting a rolling update with a fixed batch size, which can cause downtime if tasks fail during the update, or stopping all tasks before starting new ones—both violate the zero-downtime requirement. Remember the mnemonic "Blue-Green, Grace, and Scale" to recall the three pillars of zero-downtime ECS deployments.
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 is implementing a CI/CD pipeline for a containerized application using Amazon ECS and AWS CodePipeline. The team wants to ensure zero-downtime deployments. Which THREE strategies should the team implement? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a blue/green deployment strategy with an Application Load Balancer.
Options A, B, and D are correct. Using a blue/green deployment with a load balancer, configuring health checks, and using ECS service auto scaling ensure zero-downtime. Option C is incorrect because stopping all tasks causes downtime. Option E is incorrect because a rolling update with a fixed batch size can cause downtime if not managed carefully, but it is not the best practice; the question asks for three correct strategies.
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.
✓
Use a blue/green deployment strategy with an Application Load Balancer.
Why this is correct
Blue/green deployments allow traffic to be shifted gradually, ensuring zero downtime.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a rolling update with a fixed batch size of 100% of tasks.
Why it's wrong here
A batch size of 100% would stop all tasks at once, causing downtime.
✓
Use ECS service auto scaling to maintain desired count during deployment.
Why this is correct
Auto scaling ensures that the service has enough capacity during deployment.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure the ECS service with health check grace period.
Why this is correct
Health check grace period gives new tasks time to become healthy before traffic is routed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Stop all existing tasks before starting new tasks.
Why it's wrong here
Stopping all tasks causes downtime; rolling updates should replace tasks gradually.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Use a blue/green deployment strategy with an Application Load Balancer. — Options A, B, and D are correct. Using a blue/green deployment with a load balancer, configuring health checks, and using ECS service auto scaling ensure zero-downtime. Option C is incorrect because stopping all tasks causes downtime. Option E is incorrect because a rolling update with a fixed batch size can cause downtime if not managed carefully, but it is not the best practice; the question asks for three correct strategies.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is deploying a containerized application on Amazon ECS using the Fargate launch type. The deployment must ensure zero downtime. Which ECS deployment configuration should be used?
easy
A.Rolling update with a minimum healthy percent of 50% and maximum percent of 200%
B.Set the task placement strategy to REPLICA
C.Use the DAEMON scheduling strategy with a deployment circuit breaker
✓ D.Blue/green deployment using AWS CodeDeploy
Why D: Option D is correct. Blue/green deployment with CodeDeploy allows you to shift traffic gradually and automatically roll back if issues arise, ensuring zero downtime. Option A is wrong because rolling update can cause downtime if not configured properly? Actually rolling update can also achieve zero downtime if you have enough capacity, but the question asks for config that ensures zero downtime, and blue/green is more reliable. Option B is wrong because 'DAEMON' scheduling strategy is for running one task per instance, not for zero-downtime deployment. Option C is wrong because 'REPLICA' is a task placement strategy, not a deployment type.
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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.
Question Discussion
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