- A
Add a manual approval step between the backend and frontend pipelines.
Why wrong: Manual approval introduces human delay and potential errors.
- B
Create a single pipeline that deploys both services simultaneously by updating both ECS services in a single CodeDeploy deployment.
Why wrong: CodeDeploy can deploy to multiple ECS services but not atomically; also order not guaranteed.
- C
Configure the frontend pipeline to trigger after the backend pipeline completes using Amazon CloudWatch Events.
Why wrong: This ensures order but not atomicity; frontend may start before backend is fully stable.
- D
Create a single pipeline with separate stages: first deploy backend, then after successful deployment, deploy frontend.
Sequential stages in one pipeline ensure order and atomicity of the release.
Quick Answer
The answer is to create a single CodePipeline with separate stages that deploy the backend first, then the frontend. This directly addresses the need for a safe deployment order for microservices on ECS by enforcing a sequential, atomic update—the backend must be stable before the frontend can point to it, preventing the API incompatibility caused by version mismatches. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of orchestrated deployments versus independent pipelines; a common trap is assuming that separate pipelines with triggers or manual approvals can guarantee order, but they lack the atomicity of a single pipeline’s sequential stages. Remember the memory tip: “One pipeline, two stages—backend before frontend prevents API rages.”
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 deploying a microservices-based application on Amazon ECS using Fargate. The application consists of three services: frontend, backend, and database. The database service uses Amazon Aurora Serverless. The frontend and backend services are deployed as separate ECS services. The company uses AWS CodePipeline for CI/CD. Each service has its own CodePipeline pipeline that builds a Docker image and pushes it to Amazon ECR, then updates the ECS service with the new image. Recently, the backend service deployment started causing intermittent errors. After investigation, the developer found that the backend service is being updated while the frontend service is still pointing to the old backend version, causing API incompatibility. The developer needs to ensure that the backend service is updated before the frontend service, and that both are updated atomically. The developer also wants to automate the update process using CodePipeline. What should the developer do?
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 single pipeline with separate stages: first deploy backend, then after successful deployment, deploy frontend.
Option D is correct because a single pipeline with sequential stages ensures the backend is deployed first, and the frontend deploys only after the backend is stable. Option A is wrong because triggers don't control order. Option B is wrong because manual approval is not atomic and can be error-prone. Option C is wrong because updating services is not atomic; they should be in one pipeline.
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.
- ✗
Add a manual approval step between the backend and frontend pipelines.
Why it's wrong here
Manual approval introduces human delay and potential errors.
- ✗
Create a single pipeline that deploys both services simultaneously by updating both ECS services in a single CodeDeploy deployment.
Why it's wrong here
CodeDeploy can deploy to multiple ECS services but not atomically; also order not guaranteed.
- ✗
Configure the frontend pipeline to trigger after the backend pipeline completes using Amazon CloudWatch Events.
Why it's wrong here
This ensures order but not atomicity; frontend may start before backend is fully stable.
- ✓
Create a single pipeline with separate stages: first deploy backend, then after successful deployment, deploy frontend.
Why this is correct
Sequential stages in one pipeline ensure order and atomicity of the release.
Related concept
Static NAT maps one inside address to one outside address.
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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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: Create a single pipeline with separate stages: first deploy backend, then after successful deployment, deploy frontend. — Option D is correct because a single pipeline with sequential stages ensures the backend is deployed first, and the frontend deploys only after the backend is stable. Option A is wrong because triggers don't control order. Option B is wrong because manual approval is not atomic and can be error-prone. Option C is wrong because updating services is not atomic; they should be in one pipeline.
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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Last reviewed: Jun 20, 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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