The answer is that the health check timeout of 5 seconds is too short for the application to respond. When an ALB health check timeout is too short, the load balancer terminates the connection before the application’s /health endpoint can return a 200 OK, causing the ALB to mark instances as unhealthy even though the application is running correctly. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of how health check parameters—timeout, interval, and thresholds—interact; a common trap is assuming a low unhealthy threshold or a long interval is the culprit, but the timeout directly controls how long the ALB waits for a response. For exam success, remember that the timeout must be long enough to accommodate application latency under load, while the interval and thresholds manage detection speed and stability. Memory tip: “Timeout first, then threshold—if the app is slow, the timeout is the foe.”
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 is using an Application Load Balancer (ALB) in front of an Auto Scaling group of EC2 instances. The application has a health check endpoint at /health. Recently, the ALB is marking instances as unhealthy even though the application is running. The health check settings are: interval 30 seconds, timeout 5 seconds, unhealthy threshold 2. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The health check timeout of 5 seconds is too short for the application to respond.
Option A is correct because if the health check timeout is too short, the ALB may not receive a response in time. Option B is wrong because the interval is standard. Option C is wrong because the unhealthy threshold is not too high. Option D is wrong because the path is correct.
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.
✗
The health check interval of 30 seconds is too long.
Why it's wrong here
Longer interval doesn't cause false negatives.
✗
The unhealthy threshold of 2 is too high.
Why it's wrong here
Higher threshold means more tolerance, not false negatives.
✓
The health check timeout of 5 seconds is too short for the application to respond.
Why this is correct
A short timeout can cause false unhealthy markings.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The health check path /health is not accessible from the ALB.
Why it's wrong here
If not accessible, it would consistently fail, not intermittently.
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 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 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 SAP-C02 NAT questions on configuration and troubleshooting.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The health check timeout of 5 seconds is too short for the application to respond. — Option A is correct because if the health check timeout is too short, the ALB may not receive a response in time. Option B is wrong because the interval is standard. Option C is wrong because the unhealthy threshold is not too high. Option D is wrong because the path is correct.
What should I do if I get this SAP-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 SAP-C02 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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