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.
A CodeDeploy blue/green ECS deployment uses an ALB. Which two resources are required?
Two target groups for original and replacement task sets
Correct for the stated requirement.
A single target group shared by both task sets only
Why wrong: This does not meet the stated requirement as directly as the correct option.
An S3 static website endpoint
Why wrong: This does not meet the stated requirement as directly as the correct option.
Listener configuration that allows traffic shifting/testing
Correct for the stated requirement.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Two target groups for original and replacement task sets
Option A is correct because a blue/green deployment in CodeDeploy for ECS requires two distinct target groups: one for the original (blue) task set and one for the replacement (green) task set. The ALB routes traffic to the appropriate target group based on the listener rules, allowing CodeDeploy to shift traffic gradually from the blue to the green task set during deployment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Two target groups for original and replacement task sets
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
A single target group shared by both task sets only
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
An S3 static website endpoint
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Listener configuration that allows traffic shifting/testing
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often assume a single target group is sufficient because they think the ALB can differentiate between task sets internally, but in reality, each task set must have its own target group to enable independent traffic routing and rollback.
Detailed technical explanation
Under the hood, CodeDeploy creates an 'original' and 'replacement' task set in the ECS service, each registered with its own target group. The ALB listener uses a 'test' listener rule (often with a specific host header or path pattern) to route a small percentage of traffic to the green target group for validation, while the main rule continues sending traffic to the blue target group. This allows canary-style testing before a full traffic shift, and if issues arise, CodeDeploy can instantly reroute all traffic back to the blue target group by updating the listener rules.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
The correct answer is: Two target groups for original and replacement task sets — Option A is correct because a blue/green deployment in CodeDeploy for ECS requires two distinct target groups: one for the original (blue) task set and one for the replacement (green) task set. The ALB routes traffic to the appropriate target group based on the listener rules, allowing CodeDeploy to shift traffic gradually from the blue to the green task set during deployment.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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