- A
Rolling deployments require manual intervention to rollback
Why wrong: Rolling deployments can be automated to rollback.
- B
Rolling deployments update a subset of tasks at a time, which may cause slower rollback
Rolling deployments update gradually; rollback is slower.
- C
Blue/green deployments are always cheaper than rolling deployments
Why wrong: Blue/green can be more expensive due to running two environments.
- D
Blue/green deployments require running two versions of the application simultaneously
Blue/green runs both old and new environments.
- E
Blue/green deployments provide instant rollback by switching traffic back to the old environment
Rollback is immediate by changing traffic routing.
Question 276 of 1,616
ECS Blue/Green vs Rolling Deployment
This DVA-C02 practice question tests your understanding of deployment. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which THREE factors should a developer consider when choosing between a blue/green deployment and a rolling deployment for an Amazon ECS service?
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
✓
Rolling deployments update a subset of tasks at a time, which may cause slower rollback
Option B is correct because rolling deployments in Amazon ECS update a subset of tasks at a time, which means if a rollback is needed, the deployment must reverse the updates incrementally, potentially taking longer than a blue/green deployment where traffic can be switched back instantly. This slower rollback is a key trade-off when choosing between the two 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.
- ✗
Rolling deployments require manual intervention to rollback
Why it's wrong here
Rolling deployments can be automated to rollback.
- ✓
Rolling deployments update a subset of tasks at a time, which may cause slower rollback
Why this is correct
Rolling deployments update gradually; rollback is slower.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Blue/green deployments are always cheaper than rolling deployments
Why it's wrong here
Blue/green can be more expensive due to running two environments.
- ✓
Blue/green deployments require running two versions of the application simultaneously
Why this is correct
Blue/green runs both old and new environments.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Blue/green deployments provide instant rollback by switching traffic back to the old environment
Why this is correct
Rollback is immediate by changing traffic routing.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume rolling deployments always require manual rollback (Option A) when in fact ECS supports automatic rollback via the service's 'deployment circuit breaker' feature, and they may overlook the cost implications of running dual environments in blue/green deployments (Option C).
Detailed technical explanation
How to think about this question
In Amazon ECS, rolling deployments use the 'minimum healthy percent' and 'maximum percent' parameters to control how many tasks are updated at once, which can be tuned for speed or safety. Blue/green deployments leverage AWS CodeDeploy to shift traffic using an Application Load Balancer (ALB) target group swap, enabling near-instant rollback by reverting the traffic routing to the original target group. A real-world scenario where this matters is a critical production service where downtime must be minimized; blue/green allows immediate traffic switch, while rolling requires waiting for the deployment to complete or manually reverting task definitions.
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.
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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: Rolling deployments update a subset of tasks at a time, which may cause slower rollback — Option B is correct because rolling deployments in Amazon ECS update a subset of tasks at a time, which means if a rollback is needed, the deployment must reverse the updates incrementally, potentially taking longer than a blue/green deployment where traffic can be switched back instantly. This slower rollback is a key trade-off when choosing between the two strategies.
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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Last reviewed: Jul 4, 2026
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.
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