The answer is to use an Auto Scaling group with EC2 instances in two Availability Zones behind an Application Load Balancer. This is the most cost-effective and reliable approach because Auto Scaling automatically distributes SAP application instances across multiple AZs, ensuring high availability without the expense of a dedicated standby system. The Application Load Balancer handles traffic distribution and health checks, so if one AZ fails, instances are automatically replaced in the remaining AZ. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of how to achieve SAP application layer high availability on AWS cost-effectively, often contrasting it with expensive multi-AZ database setups or single-instance failover solutions. A common trap is choosing a multi-AZ database cluster for the application layer, but that only addresses the database, not the application servers. Memory tip: think “spread and scale” — spread instances across AZs, scale with Auto Scaling, and let the ALB balance the load.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
An SAP system is running on EC2 with a single Availability Zone. The company needs to increase availability for the SAP application layer. Which is the most cost-effective and reliable approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an Auto Scaling group with EC2 instances in two Availability Zones behind an Application Load Balancer.
Option A is correct because Auto Scaling across AZs provides high availability and cost efficiency. Option B is wrong because it is more expensive and complex. Option C is wrong because it provides failover but not load distribution. Option D is wrong because it does not help with application availability.
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.
✗
Deploy a second EC2 instance in the same AZ and configure a Route 53 weighted routing policy.
Why it's wrong here
Same AZ does not protect against AZ failure; weighted routing is not automatic failover.
✓
Use an Auto Scaling group with EC2 instances in two Availability Zones behind an Application Load Balancer.
Why this is correct
Auto Scaling with multiple AZs provides cost-effective high availability and load distribution.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a multi-AZ RDS database and keep the application on a single EC2 instance.
Why it's wrong here
Database is HA but application layer remains a single point of failure.
✗
Use an EC2 instance in a different region and use Route 53 latency-based routing.
Why it's wrong here
Cross-region adds latency and cost; not cost-effective for application layer.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
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: Use an Auto Scaling group with EC2 instances in two Availability Zones behind an Application Load Balancer. — Option A is correct because Auto Scaling across AZs provides high availability and cost efficiency. Option B is wrong because it is more expensive and complex. Option C is wrong because it provides failover but not load distribution. Option D is wrong because it does not help with application availability.
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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Question Discussion
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