- A
Ensure the health check path is case-insensitive.
Why wrong: Health checks are case-sensitive.
- B
Increase the health check interval and timeout values.
Why wrong: This might mask the issue, not solve it.
- C
Confirm that the health check path is correctly configured to '/health' on the target group.
Misconfigured path leads to non-200 responses.
- D
Verify that the health check port matches the application port.
Why wrong: If the port were wrong, the health check would fail entirely, not intermittently.
Question 580 of 1,750
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. 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 runs a web application on Amazon EC2 instances behind an Application Load Balancer (ALB). The application uses a custom health check endpoint '/health'. The DevOps team notices that the ALB is marking some instances as unhealthy even though the application is running fine. The team checks the security groups and network ACLs and confirms they allow traffic. What should the team check next?
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
✓
Confirm that the health check path is correctly configured to '/health' on the target group.
Option C is correct because the ALB health check uses the configured path; if it's not exactly '/health', the health check may fail even though the application is running. Option A is incorrect because the health check path is case-sensitive by default; changing to case-insensitive would not resolve a path mismatch. Option B is incorrect because increasing the interval or timeout only masks the symptom without addressing the root cause. Option D is incorrect because the health check port is typically the same as the traffic port; the issue here is the path, not the port.
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.
- ✗
Ensure the health check path is case-insensitive.
Why it's wrong here
Health checks are case-sensitive.
- ✗
Increase the health check interval and timeout values.
Why it's wrong here
This might mask the issue, not solve it.
- ✓
Confirm that the health check path is correctly configured to '/health' on the target group.
Why this is correct
Misconfigured path leads to non-200 responses.
Related concept
CIDR notation defines the prefix length.
- ✗
Verify that the health check port matches the application port.
Why it's wrong here
If the port were wrong, the health check would fail entirely, not intermittently.
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 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.
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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Monitoring and Logging — study guide chapter
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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: Confirm that the health check path is correctly configured to '/health' on the target group. — Option C is correct because the ALB health check uses the configured path; if it's not exactly '/health', the health check may fail even though the application is running. Option A is incorrect because the health check path is case-sensitive by default; changing to case-insensitive would not resolve a path mismatch. Option B is incorrect because increasing the interval or timeout only masks the symptom without addressing the root cause. Option D is incorrect because the health check port is typically the same as the traffic port; the issue here is the path, not the port.
What should I do if I get this DOP-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 DOP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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