The answer is Amazon EC2 Auto Scaling and Amazon CloudWatch. This combination works because Auto Scaling can maintain a fixed instance count, automatically launching a replacement EC2 instance if the original fails, while CloudWatch alarms monitor instance health and trigger the recovery or replacement process. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of high availability for SAP workloads, where the key trap is assuming AWS Lambda or Route 53 health checks can restart instances—Lambda lacks native instance restart logic, and Route 53 only reroutes traffic. For SAP systems, remember that Auto Scaling handles the instance lifecycle, and CloudWatch provides the health signal; together they form a self-healing loop. Memory tip: think “Watch and Scale” for automatic restart—CloudWatch watches, Auto Scaling scales back in.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
During an SAP system migration to AWS, the team needs to ensure that the SAP application can automatically restart if the EC2 instance fails. Which combination of AWS services should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon EC2 Auto Scaling and Amazon CloudWatch
Option A is correct because Auto Scaling with a fixed instance count can automatically replace failed instances, and CloudWatch alarms can trigger recovery. Option B is wrong because Lambda does not natively restart instances. Option C is wrong because Route 53 health checks do not restart instances. Option D is wrong because Elastic Beanstalk is for web applications, not SAP.
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.
✗
AWS Elastic Beanstalk and Amazon RDS
Why it's wrong here
Elastic Beanstalk is for simple web apps, not complex SAP systems.
✓
Amazon EC2 Auto Scaling and Amazon CloudWatch
Why this is correct
Auto Scaling replaces unhealthy instances, and CloudWatch alarms can initiate recovery actions.
Related concept
Static NAT maps one inside address to one outside address.
✗
AWS Lambda and Amazon SQS
Why it's wrong here
Lambda requires custom code and SQS for queuing, not a direct restart mechanism.
✗
Amazon Route 53 and Elastic Load Balancing
Why it's wrong here
These services handle traffic routing, not instance recovery.
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 PAS-C01 NAT questions on configuration and troubleshooting.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Amazon EC2 Auto Scaling and Amazon CloudWatch — Option A is correct because Auto Scaling with a fixed instance count can automatically replace failed instances, and CloudWatch alarms can trigger recovery. Option B is wrong because Lambda does not natively restart instances. Option C is wrong because Route 53 health checks do not restart instances. Option D is wrong because Elastic Beanstalk is for web applications, not SAP.
What should I do if I get this PAS-C01 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 PAS-C01 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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