Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A web application runs on an Auto Scaling group (ASG) behind an Application Load Balancer (ALB). After a new release, instances begin failing ALB health checks with errors like 502 while the application is still starting up. CloudWatch shows that the ASG replaces the instances before they finish initializing, so traffic never reaches healthy targets. Which change most directly prevents premature replacement during startup so traffic can resume as soon as the instances are actually healthy?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Reduce the ALB health check timeout to 1 second so failures are detected faster.
Shortening the timeout can increase false negatives during startup and make instances appear unhealthy even sooner, which can increase churn.
B
Best answer
Increase the Auto Scaling group health check grace period to cover application startup and initialization time.
The ASG health check grace period tells Auto Scaling to ignore failing health checks for a period after instance launch. This prevents newly launched instances from being replaced before the application has finished booting and can pass ALB health checks.
C
Distractor review
Enable connection draining on the ALB target group but set deregistration delay to 0 seconds.
Connection draining helps in-flight requests complete during deregistration, but it does not stop the ASG from replacing instances that are failing health checks during startup.
D
Distractor review
Switch the ALB target group health checks from HTTP to TCP so the application does not need to return HTTP 200.
TCP health checks only confirm that the port is open. They can mark an instance healthy even if the application is not actually ready to serve requests.
Common exam trap
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.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A team needs to distribute TCP traffic (not HTTP) across multiple services. The services must see the original client source IP for auditing. Which AWS load balancer is the best fit?
Question 2
A team wants to run containerized services with AWS-managed orchestration and autoscaling. They do NOT require Kubernetes compatibility. Which AWS service choice is most appropriate to meet these goals?
Question 3
A solutions architect is designing an S3 bucket for a IoT ingestion API. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure? The design must avoid adding custom operational scripts.
Question 4
A solutions architect is designing an S3 bucket for a claims portal. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure?
Question 5
A team wants to delegate IAM management to developers, but must ensure developers can never grant themselves permissions beyond a specific limit. Which AWS mechanism best matches this requirement?
Question 6
A solutions architect is designing an S3 bucket for a healthcare document service. The objects must never be publicly accessible, even if a developer later adds an overly broad bucket policy. What should the architect configure?
FAQ
Questions learners often ask
What does this SAA-C03 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Increase the Auto Scaling group health check grace period to cover application startup and initialization time. — The failure mode is premature replacement of new instances before the application finishes starting. In AWS, the Auto Scaling group health check grace period is the setting that prevents Auto Scaling from acting on failed health checks too early after launch. This gives the application time to initialize, after which the ALB health checks can pass and traffic can resume normally. Reducing the ALB health check timeout can worsen startup false negatives. Connection draining affects how existing connections are handled during deregistration, not whether the ASG terminates instances during warmup. TCP health checks verify only connectivity, not application readiness, and can route traffic to an instance that is not actually healthy.
What should I do if I get this SAA-C03 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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