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Troubleshooting and Optimization →easyMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is that the memory and CPU values are specified as strings instead of integers. In an ECS task definition, both the task-level and container-level memory and CPU fields must be provided as integers (e.g., 512) rather than as quoted strings (e.g., '512'), because the ECS service expects numeric values to properly allocate resources from the underlying EC2 or Fargate infrastructure. When these values are strings, the task fails to parse the resource requirements, often resulting in an "insufficient memory" error even if the numeric values themselves are valid. On the AWS Certified Developer Associate DVA-C02 exam, this is a common trap: the JSON exhibit will look correct at a glance, but the quotes around the numbers are the hidden issue. A quick memory tip is to remember that ECS resources are numbers, not words—if you see quotes around memory or CPU, that’s your red flag.

DVA-C02 Troubleshooting and Optimization Practice Question

This DVA-C02 practice question tests your understanding of troubleshooting and optimization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Exhibit

Refer to the exhibit.

```
{
    "containerDefinitions": [
        {
            "name": "app",
            "image": "nginx:latest",
            "portMappings": [
                {
                    "containerPort": 80,
                    "protocol": "tcp"
                }
            ],
            "memory": 256,
            "cpu": 256
        }
    ],
    "memory": "512",
    "cpu": "256"
}
```

A developer is creating an ECS task definition using the JSON shown in the exhibit. The task fails to run with an error about insufficient memory. What is the issue?

Question 1easymultiple choice
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Exhibit

Refer to the exhibit.

```
{
    "containerDefinitions": [
        {
            "name": "app",
            "image": "nginx:latest",
            "portMappings": [
                {
                    "containerPort": 80,
                    "protocol": "tcp"
                }
            ],
            "memory": 256,
            "cpu": 256
        }
    ],
    "memory": "512",
    "cpu": "256"
}
```

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

✓

The task memory and cpu values are specified as strings instead of integers.

Option A is correct because the container memory (256) plus task memory (512) must be consistent; the task memory is 512 but the container memory is 256, which is okay, but the error indicates the container memory is higher than task memory? Actually, the task memory is 512, container memory 256, so it's fine. However, the exhibit shows task memory as a string '512' and CPU as '256'; they should be integers. Option A is the most likely: the task memory is set to 512 but the container memory is 256, which is less, so that's not an issue. Wait, the error is about insufficient memory. Perhaps the container memory should be equal to task memory? Actually, the error might be because the task memory is not enough for the container? The container memory is 256, task memory 512, so that's fine. Let me reconsider. The exhibit shows 'memory': '512' (string) and 'cpu': '256' (string). In ECS task definition, memory and cpu must be integers, not strings. That could cause the task to fail. Option B is correct: the values are strings. Option A is wrong because container memory is less than task memory. Option C is wrong because container port mapping is valid. Option D is wrong because network mode is not specified, but default is bridge which is fine.

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.

  • ✗

    The container port is not mapped to a host port.

    Why it's wrong here

    Port mapping is valid; host port is optional.

  • ✗

    The task definition does not specify a network mode.

    Why it's wrong here

    Default network mode is bridge, which is acceptable.

  • ✓

    The task memory and cpu values are specified as strings instead of integers.

    Why this is correct

    Memory and cpu must be integers, not strings.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The container memory is less than the task memory.

    Why it's wrong here

    Container memory can be less than task memory.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • 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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.

What to study next

Got this wrong? Here's your next step.

Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this DVA-C02 question test?

Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The task memory and cpu values are specified as strings instead of integers. — Option A is correct because the container memory (256) plus task memory (512) must be consistent; the task memory is 512 but the container memory is 256, which is okay, but the error indicates the container memory is higher than task memory? Actually, the task memory is 512, container memory 256, so it's fine. However, the exhibit shows task memory as a string '512' and CPU as '256'; they should be integers. Option A is the most likely: the task memory is set to 512 but the container memory is 256, which is less, so that's not an issue. Wait, the error is about insufficient memory. Perhaps the container memory should be equal to task memory? Actually, the error might be because the task memory is not enough for the container? The container memory is 256, task memory 512, so that's fine. Let me reconsider. The exhibit shows 'memory': '512' (string) and 'cpu': '256' (string). In ECS task definition, memory and cpu must be integers, not strings. That could cause the task to fail. Option B is correct: the values are strings. Option A is wrong because container memory is less than task memory. Option C is wrong because container port mapping is valid. Option D is wrong because network mode is not specified, but default is bridge which is fine.

What should I do if I get this DVA-C02 question wrong?

Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 20, 2026

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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.