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Question 1,059 of 1,750

Monitoring and Logging →easyMultiple ChoiceObjective-mapped

DOP-C02 Monitoring and Logging Practice Question

This DOP-C02 practice question tests your understanding of monitoring and logging. 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.

An application running on Amazon EC2 instances sends custom metrics to CloudWatch. The team notices that some metrics are not appearing. What is the most likely cause?

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.

A
The custom metric namespace is not pre-registered in CloudWatch.
Why wrong: Namespaces are created automatically when metrics are published.
B
The EC2 instances are in a private subnet without a NAT gateway.
Why wrong: The agent can use VPC endpoints to reach CloudWatch without internet.
C
The IAM role attached to the EC2 instance lacks permissions to publish metrics.
Why wrong: This is a common issue, but the agent must also be properly configured.
D
The CloudWatch agent is not installed or configured on the EC2 instances.
Custom metrics require the CloudWatch agent or direct API calls.

Full breakdown with real-world context →

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 CloudWatch agent is not installed or configured on the EC2 instances.

The most likely cause is that the CloudWatch agent is not installed or configured on the EC2 instances. Custom metrics require the CloudWatch agent to collect and send data to CloudWatch. Option A is incorrect because custom metric namespaces do not need to be pre-registered; they are automatically created when metrics are published. Option B is incorrect because instances in a private subnet can still publish metrics using a VPC endpoint or a proxy, so a NAT gateway is not strictly required. Option C is incorrect because even with proper IAM permissions, the CloudWatch agent must be installed and running to collect and send custom metrics. Therefore, option D is correct.

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 custom metric namespace is not pre-registered in CloudWatch.
Why it's wrong here
Namespaces are created automatically when metrics are published.
✗
The EC2 instances are in a private subnet without a NAT gateway.
Why it's wrong here
The agent can use VPC endpoints to reach CloudWatch without internet.
✗
The IAM role attached to the EC2 instance lacks permissions to publish metrics.
Why it's wrong here
This is a common issue, but the agent must also be properly configured.
✓
The CloudWatch agent is not installed or configured on the EC2 instances.
Why this is correct
Custom metrics require the CloudWatch agent or direct API calls.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.

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.

Visual reference

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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Monitoring and Logging — This question tests Monitoring and Logging — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The CloudWatch agent is not installed or configured on the EC2 instances. — The most likely cause is that the CloudWatch agent is not installed or configured on the EC2 instances. Custom metrics require the CloudWatch agent to collect and send data to CloudWatch. Option A is incorrect because custom metric namespaces do not need to be pre-registered; they are automatically created when metrics are published. Option B is incorrect because instances in a private subnet can still publish metrics using a VPC endpoint or a proxy, so a NAT gateway is not strictly required. Option C is incorrect because even with proper IAM permissions, the CloudWatch agent must be installed and running to collect and send custom metrics. Therefore, option D is correct.

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

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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This DOP-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 DOP-C02 exam.