The answer is to use AWS CodeDeploy to orchestrate a blue/green deployment by creating a new task set and shifting traffic. This is correct because CodeDeploy natively integrates with Amazon ECS and Fargate to manage the entire lifecycle: it provisions a new task set with the updated service version, registers it with the existing Application Load Balancer, and then gradually shifts traffic from the old (blue) task set to the new (green) one, all while monitoring health checks to ensure zero downtime. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how CodeDeploy handles ECS blue/green deployments as a managed alternative to manual updates or multiple ALBs. A common trap is assuming you need a second ALB or manually updating target groups, but CodeDeploy reuses the existing ALB and automates traffic shifting. Memory tip: think "CodeDeploy creates a new task set, not a new ALB" — the load balancer stays the same, only the target task set changes.
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 migrating a monolithic application to microservices on AWS. They want to use a blue/green deployment strategy for a new version of a service running on Amazon ECS with Fargate. The service is behind an Application Load Balancer. Which combination of actions should be taken to implement blue/green deployment with minimal downtime? (Choose the correct answer.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS CodeDeploy to orchestrate a blue/green deployment by creating a new task set and shifting traffic.
Option D is correct because AWS CodeDeploy supports blue/green deployments on ECS, creating a new task set and shifting traffic. Option A is wrong because updating the existing service directly causes downtime. Option B is wrong because a second ALB is unnecessary and adds complexity. Option C is wrong because manually updating target groups is error-prone and not automated.
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.
✗
Create a second ALB pointing to the new service, then update DNS to switch traffic.
Why it's wrong here
DNS propagation delays cause downtime; not a AWS-recommended pattern for ECS.
✓
Use AWS CodeDeploy to orchestrate a blue/green deployment by creating a new task set and shifting traffic.
Why this is correct
CodeDeploy automates blue/green deployments on ECS with minimal downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Update the existing ECS service with the new task definition and allow rolling update.
Why it's wrong here
Rolling update causes downtime as old tasks are replaced gradually.
✗
Manually create a new target group with the new service and update the ALB listener rule.
Why it's wrong here
Manual steps are error-prone and not automated; requires careful coordination.
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 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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. 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.
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 DVA-C02 NAT questions on configuration and troubleshooting.
Deployment — This question tests Deployment — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use AWS CodeDeploy to orchestrate a blue/green deployment by creating a new task set and shifting traffic. — Option D is correct because AWS CodeDeploy supports blue/green deployments on ECS, creating a new task set and shifting traffic. Option A is wrong because updating the existing service directly causes downtime. Option B is wrong because a second ALB is unnecessary and adds complexity. Option C is wrong because manually updating target groups is error-prone and not automated.
What should I do if I get this DVA-C02 question wrong?
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 DVA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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