The correct answer is to configure a health check that checks a specific application endpoint, because this moves beyond basic infrastructure-level checks (like TCP or HTTP on a generic path) to a deep health check that validates the actual application logic. By targeting an endpoint that confirms the application is fully initialized, processing requests, and returning the correct response, the ELB can accurately distinguish between a healthy instance and one that is merely running but unresponsive to user traffic. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of how to design resilient architectures—a common trap is assuming that a simple ping or default “/” check is sufficient, when in reality slow response times often stem from application-layer failures that a shallow check misses. Remember the mnemonic “Deep for DevOps”: a deep health check on a dedicated endpoint (e.g., /health or /api/status) ensures the instance is truly serving traffic, not just breathing.
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 uses an AWS Elastic Load Balancer (ELB) to distribute traffic to EC2 instances. During an incident, some users report slow response times. The DevOps engineer suspects that one instance is unhealthy but the health check is not detecting it. What should the engineer do to improve health check accuracy?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a health check that checks a specific application endpoint
Option C is correct because a deep health check (checking an application-specific endpoint) ensures the instance is truly healthy. Option A is incorrect because increasing the interval makes checks less frequent. Option B is incorrect because decreasing the threshold makes it easier to mark unhealthy. Option D is incorrect because the health check path should be specific to the application.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the health check interval to reduce load on instances
Why it's wrong here
Longer intervals mean slower detection of failures.
✓
Configure a health check that checks a specific application endpoint
Why this is correct
Deep health checks verify application availability.
Related concept
Static NAT maps one inside address to one outside address.
✗
Decrease the health check unhealthy threshold to 2
Why it's wrong here
Lower threshold makes it easier to mark unhealthy, but doesn't improve accuracy.
✗
Set the health check path to the root document ('/')
Why it's wrong here
Root path may not reflect application health.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
Incident and Event Response — This question tests Incident and Event Response — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure a health check that checks a specific application endpoint — Option C is correct because a deep health check (checking an application-specific endpoint) ensures the instance is truly healthy. Option A is incorrect because increasing the interval makes checks less frequent. Option B is incorrect because decreasing the threshold makes it easier to mark unhealthy. Option D is incorrect because the health check path should be specific to the application.
What should I do if I get this DOP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DOP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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