The answer is to use Amazon Route 53 with health checks and a custom script to update the DNS record on failover. This approach works because Route 53 health checks continuously monitor the ASCS instance, and when a failure is detected, a custom script can automatically update the DNS A record to point to the healthy secondary instance in the other Availability Zone, effectively rerouting SAP client traffic without the need for a load balancer. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding that stateful SAP central services like ASCS cannot use an Application Load Balancer (which would break the sticky connection) or Auto Scaling (designed for stateless scaling), and that EC2 Auto Recovery only recovers within the same AZ. A common trap is assuming a load balancer can handle ASCS traffic, but SAP requires a single active IP address for the ASCS virtual hostname. Memory tip: think "DNS flip, not ALB trip" for ASCS failover.
PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. 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 deploying SAP S/4HANA on AWS and needs to ensure high availability for the central services (ASCS and ERS). The architecture uses two EC2 instances in different Availability Zones with a shared file system using Amazon EFS for /sapmnt. The SAP system is configured with an enqueue replication server. The operations team needs to automate the failover of the ASCS instance in case of a failure. The team is considering using AWS services for this purpose. Which approach should the team use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Amazon Route 53 with health checks and a custom script to update DNS record on failover.
Using AWS Route 53 health checks to monitor the ASCS instance and a custom script to update DNS records on failover provides a simple and effective HA solution. Option D is correct. Option A is wrong because ALB cannot direct traffic to a single SAP instance for ASCS. Option B is wrong because Auto Scaling is for scaling out, not HA for stateful services. Option C is wrong because EC2 Auto Recovery recovers the instance but does not handle failover to another AZ.
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.
✓
Use Amazon Route 53 with health checks and a custom script to update DNS record on failover.
Why this is correct
DNS-based failover can redirect clients to the secondary ASCS instance.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an Application Load Balancer with a target group containing both ASCS instances.
Why it's wrong here
ALB is for HTTP traffic, not for SAP-specific protocols.
✗
Use an Auto Scaling group with a minimum of 2 instances and a lifecycle hook to handle failover.
Why it's wrong here
Auto Scaling is designed for stateless applications.
✗
Enable EC2 Auto Recovery to automatically recover the ASCS instance on new hardware.
Why it's wrong here
Auto Recovery does not failover to another AZ.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Operations and Maintenance — This question tests Operations and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Amazon Route 53 with health checks and a custom script to update DNS record on failover. — Using AWS Route 53 health checks to monitor the ASCS instance and a custom script to update DNS records on failover provides a simple and effective HA solution. Option D is correct. Option A is wrong because ALB cannot direct traffic to a single SAP instance for ASCS. Option B is wrong because Auto Scaling is for scaling out, not HA for stateful services. Option C is wrong because EC2 Auto Recovery recovers the instance but does not handle failover to another AZ.
What should I do if I get this PAS-C01 question wrong?
Identify which PAS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This PAS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PAS-C01 exam.
Question Discussion
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