- A
EC2 Auto Scaling group
Why wrong: Auto Scaling is for scaling, not recovery of a single instance.
- B
AWS Lambda with a scheduled function
Why wrong: Lambda can be used but is more complex; CloudWatch Auto Recovery is the native solution.
- C
Elastic Load Balancing (ELB)
Why wrong: ELB distributes traffic, does not restart instances.
- D
Amazon CloudWatch with EC2 Auto Recovery
CloudWatch can detect instance failure and automatically recover the instance.
Question 1,236 of 1,733
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.
A company is running SAP NetWeaver on AWS and wants to implement high availability for the ASCS instance. Which AWS service can be used to monitor and automatically restart the ASCS instance if it fails?
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
✓
Amazon CloudWatch with EC2 Auto Recovery
Amazon CloudWatch with EC2 Auto Recovery is the correct choice because it monitors the health of an EC2 instance at the hypervisor level and can automatically recover a failed instance by restarting it on a new host. For SAP NetWeaver ASCS instances, which require persistent state and are typically tied to a single instance, Auto Recovery ensures the instance is restored with the same private IP, Elastic IP, and instance metadata, maintaining the SAP cluster quorum without manual intervention.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
EC2 Auto Scaling group
Why it's wrong here
Auto Scaling is for scaling, not recovery of a single instance.
- ✗
AWS Lambda with a scheduled function
Why it's wrong here
Lambda can be used but is more complex; CloudWatch Auto Recovery is the native solution.
- ✗
Elastic Load Balancing (ELB)
Why it's wrong here
ELB distributes traffic, does not restart instances.
- ✓
Amazon CloudWatch with EC2 Auto Recovery
Why this is correct
CloudWatch can detect instance failure and automatically recover the instance.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse EC2 Auto Recovery with EC2 Auto Scaling, assuming both can restart a failed instance, but Auto Scaling replaces instances rather than recovering them in-place, which breaks the persistent IP and state required for SAP ASCS high availability.
Detailed technical explanation
How to think about this question
EC2 Auto Recovery leverages the AWS Nitro System's health checks at the hypervisor level, detecting hardware or software failures that render the instance unreachable, and automatically stops and starts the instance on a healthy host while preserving its instance ID, private IP, and Elastic IP. For SAP NetWeaver ASCS, this is critical because the ASCS instance uses a fixed IP address for the SAP cluster's virtual hostname, and any change would break the cluster's communication and require manual reconfiguration. In a real-world scenario, if the underlying physical host fails, Auto Recovery can restore the ASCS instance within minutes, whereas manual recovery or a new instance from Auto Scaling would cause extended downtime and cluster split-brain issues.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon CloudWatch with EC2 Auto Recovery — Amazon CloudWatch with EC2 Auto Recovery is the correct choice because it monitors the health of an EC2 instance at the hypervisor level and can automatically recover a failed instance by restarting it on a new host. For SAP NetWeaver ASCS instances, which require persistent state and are typically tied to a single instance, Auto Recovery ensures the instance is restored with the same private IP, Elastic IP, and instance metadata, maintaining the SAP cluster quorum without manual intervention.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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