- A
Create one ECS service with both containers in the same task definition, but only expose the web server port.
Why wrong: Both containers would be in the same task and would scale together. The worker would also be in the public subnet, potentially exposing it, and independent scaling is not possible.
- B
Create two separate ECS services, each with its own task definition, and place the web server in a public subnet with the worker in a private subnet.
Correct. Separate services allow independent scaling. Placing the web server in a public subnet with an ALB provides internet access, while the worker in a private subnet remains isolated.
- C
Create one ECS service with two tasks, each containing one container.
Why wrong: This is essentially two tasks in one service, which would still share the same service scaling settings and placement. It does not allow independent scaling or subnet placement per container.
- D
Create one ECS service with two containers in the same task, and use a service discovery to expose the worker.
Why wrong: Service discovery is for internal DNS, not for scaling or network access. The worker would be in the same task and subnet as the web server, likely exposing it.
Quick Answer
The answer is to create two separate ECS services, each with its own task definition, and place the web server in a public subnet with the worker in a private subnet. This configuration is correct because it enables multi-container ECS independent scaling and network isolation: each service can be scaled independently based on its own load, while placing the worker in a private subnet ensures it cannot be reached from the internet, and the web server in a public subnet behind an Application Load Balancer handles external traffic. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding that a single task definition cannot give you independent scaling or separate network exposure for different containers—a common trap is trying to put both containers in one task definition. Remember the memory tip: “Two tasks, two subnets, two scaling knobs” — one service for public-facing work, one for private background work.
DVA-C02 Deployment Practice Question
This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 developer is deploying a multi-container Docker application on Amazon ECS using the Fargate launch type. The application consists of a web server and a background worker. The web server must be scaled independently and must be accessible from the internet via an Application Load Balancer. The worker should not be accessible from the internet. Which ECS configuration should the developer use?
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 two separate ECS services, each with its own task definition, and place the web server in a public subnet with the worker in a private subnet.
Option B is correct because it uses two separate ECS services, each with its own task definition, allowing independent scaling of the web server and worker. Placing the web server in a public subnet with an Application Load Balancer makes it internet-accessible, while the worker in a private subnet is isolated from direct internet traffic, meeting the security requirement.
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.
- ✗
Create one ECS service with both containers in the same task definition, but only expose the web server port.
Why it's wrong here
Both containers would be in the same task and would scale together. The worker would also be in the public subnet, potentially exposing it, and independent scaling is not possible.
- ✓
Create two separate ECS services, each with its own task definition, and place the web server in a public subnet with the worker in a private subnet.
Why this is correct
Correct. Separate services allow independent scaling. Placing the web server in a public subnet with an ALB provides internet access, while the worker in a private subnet remains isolated.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create one ECS service with two tasks, each containing one container.
Why it's wrong here
This is essentially two tasks in one service, which would still share the same service scaling settings and placement. It does not allow independent scaling or subnet placement per container.
- ✗
Create one ECS service with two containers in the same task, and use a service discovery to expose the worker.
Why it's wrong here
Service discovery is for internal DNS, not for scaling or network access. The worker would be in the same task and subnet as the web server, likely exposing it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume containers in the same task definition can be independently scaled or that service discovery alone provides network isolation, but in ECS, containers in the same task share the same resources and scaling lifecycle, and service discovery does not restrict internet access.
Detailed technical explanation
How to think about this question
In Amazon ECS with the Fargate launch type, each task definition defines a set of containers that share the same network namespace (same ENI and IP address), so they cannot be scaled independently. By using separate services, each with its own task definition, you can set different desired counts and auto-scaling policies. Placing the web server service in a public subnet with an ALB (using an internet-facing scheme) exposes it via port 80/443, while the worker service in a private subnet (without a public IP or internet gateway route) is inherently isolated, even if it has a port mapping; security groups further enforce this isolation.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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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: Create two separate ECS services, each with its own task definition, and place the web server in a public subnet with the worker in a private subnet. — Option B is correct because it uses two separate ECS services, each with its own task definition, allowing independent scaling of the web server and worker. Placing the web server in a public subnet with an Application Load Balancer makes it internet-accessible, while the worker in a private subnet is isolated from direct internet traffic, meeting the security requirement.
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: 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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