DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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.
A company has a legacy application that generates log files on an EC2 instance. The developer needs to stream these log files to Amazon CloudWatch Logs in real time. The developer installed the CloudWatch agent on the EC2 instance and configured it to monitor the log files. However, the logs are not appearing in CloudWatch Logs. The developer checks the agent status and sees that the agent is running. What is the most likely cause of this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The EC2 instance does not have an IAM role with the necessary CloudWatch Logs permissions.
Option A is correct because the CloudWatch agent needs an IAM role with permissions to put log events. Option B is wrong because the agent does not need internet access if using VPC endpoints. Option C is wrong because the agent configuration file does not require a log group to exist beforehand; it can create it. Option D is wrong because the agent can handle various log formats; format mismatch would not prevent logs from appearing, but they might be parsed incorrectly.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 log file format is not compatible with the CloudWatch agent.
Why it's wrong here
The agent can handle any text log file; format does not prevent ingestion.
✗
The EC2 instance is in a private subnet without internet access.
Why it's wrong here
The agent can use VPC endpoints to reach CloudWatch without internet.
✓
The EC2 instance does not have an IAM role with the necessary CloudWatch Logs permissions.
Why this is correct
The CloudWatch agent requires permissions such as logs:PutLogEvents, logs:CreateLogStream, and logs:DescribeLogStreams.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The CloudWatch agent configuration file does not specify an existing log group.
Why it's wrong here
The agent can create the log group if it does not exist.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Development with AWS Services — This question tests Development with AWS Services — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The EC2 instance does not have an IAM role with the necessary CloudWatch Logs permissions. — Option A is correct because the CloudWatch agent needs an IAM role with permissions to put log events. Option B is wrong because the agent does not need internet access if using VPC endpoints. Option C is wrong because the agent configuration file does not require a log group to exist beforehand; it can create it. Option D is wrong because the agent can handle various log formats; format mismatch would not prevent logs from appearing, but they might be parsed incorrectly.
What should I do if I get this DVA-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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