- A
Use an Elastic IP address and reassign it during failover using a script.
Correct. Elastic IP can be reassigned between instances in different Availability Zones via automated scripts, providing a manageable virtual IP for SAP ASCS/ERS failover.
- B
Configure Amazon Route 53 with failover routing and health checks for the virtual IP.
Why wrong: Incorrect. Route 53 performs DNS failover, which involves DNS propagation delays and does not directly manage a virtual IP address. It is not suitable for the sub-second failover needed by SAP ASCS/ERS.
- C
Deploy an Application Load Balancer to route traffic to the active instance.
Why wrong: Incorrect. Application Load Balancer is a Layer 7 load balancer that doesn't support static IP failover; it is designed for HTTP/HTTPS traffic, not SAP protocols.
- D
Set up a Classic Load Balancer with cross-zone load balancing enabled.
Why wrong: Incorrect. Classic Load Balancer is deprecated and does not provide the necessary static IP or failover capabilities for SAP ASCS/ERS.
PAS-C01 Elastic IP Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: elastic IP. 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 migrating its SAP ERP system to AWS and needs to ensure high availability for the SAP Central Services (ASCS) and Enqueue Replication Server (ERS). They plan to use two EC2 instances in different Availability Zones with a shared file system. Which AWS service should they use to manage the failover of the virtual IP address?
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
Use an Elastic IP address and reassign it during failover using a script.
Option A is correct because an Elastic IP address can be used as a virtual IP for SAP ASCS/ERS failover. By associating the Elastic IP with the active EC2 instance in one Availability Zone, and having a script (e.g., a watchdog process) automatically reassociate the Elastic IP to the standby instance upon failure, you can achieve virtual IP failover. This is a common pattern on AWS for SAP high availability when using shared file systems. Option B is incorrect because Amazon Route 53 provides DNS failover, not virtual IP management; DNS time-to-live (TTL) delays make it unsuitable for fast failover in SAP environments. Option C is incorrect because an Application Load Balancer operates at Layer 7 and does not provide a static IP for SAP protocols. Option D is incorrect because Classic Load Balancer is deprecated and lacks the required static IP failover capability.
Key principle: Elastic IP
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 an Elastic IP address and reassign it during failover using a script.
Why this is correct
Correct. Elastic IP can be reassigned between instances in different Availability Zones via automated scripts, providing a manageable virtual IP for SAP ASCS/ERS failover.
Related concept
Elastic IP
- ✗
Configure Amazon Route 53 with failover routing and health checks for the virtual IP.
Why it's wrong here
Incorrect. Route 53 performs DNS failover, which involves DNS propagation delays and does not directly manage a virtual IP address. It is not suitable for the sub-second failover needed by SAP ASCS/ERS.
- ✗
Deploy an Application Load Balancer to route traffic to the active instance.
Why it's wrong here
Incorrect. Application Load Balancer is a Layer 7 load balancer that doesn't support static IP failover; it is designed for HTTP/HTTPS traffic, not SAP protocols.
- ✗
Set up a Classic Load Balancer with cross-zone load balancing enabled.
Why it's wrong here
Incorrect. Classic Load Balancer is deprecated and does not provide the necessary static IP or failover capabilities for SAP ASCS/ERS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may think Route 53 is the solution for virtual IP failover, but DNS failover is not equivalent to IP address failover. The correct approach uses a floating IP address, typically via an Elastic IP or Network Load Balancer.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Elastic IP
- SAP ASCS/ERS
- Virtual IP failover
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
Elastic IP
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
IPv4 Address Class Summary
| Class | First Octet Range | Default Mask | Networks | Hosts per Network |
|---|---|---|---|---|
| A | 1–126 | /8 (255.0.0.0) | 126 | 16,777,214 |
| B | 128–191 | /16 (255.255.0.0) | 16,384 | 65,534 |
| C | 192–223 | /24 (255.255.255.0) | 2,097,152 | 254 |
| D | 224–239 | N/A | Multicast groups | — |
| E | 240–255 | N/A | Reserved / experimental | — |
127.x.x.x is reserved for loopback. Modern networks use CIDR (classless) rather than classful addressing.
What to study next
Got this wrong? Here's your next step.
Review elastic IP, then practise related PAS-C01 questions on the same topic to reinforce the concept.
- →
Operations and Maintenance — study guide chapter
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Operations and Maintenance — This question tests Operations and Maintenance — Elastic IP.
What is the correct answer to this question?
The correct answer is: Use an Elastic IP address and reassign it during failover using a script. — Option A is correct because an Elastic IP address can be used as a virtual IP for SAP ASCS/ERS failover. By associating the Elastic IP with the active EC2 instance in one Availability Zone, and having a script (e.g., a watchdog process) automatically reassociate the Elastic IP to the standby instance upon failure, you can achieve virtual IP failover. This is a common pattern on AWS for SAP high availability when using shared file systems. Option B is incorrect because Amazon Route 53 provides DNS failover, not virtual IP management; DNS time-to-live (TTL) delays make it unsuitable for fast failover in SAP environments. Option C is incorrect because an Application Load Balancer operates at Layer 7 and does not provide a static IP for SAP protocols. Option D is incorrect because Classic Load Balancer is deprecated and lacks the required static IP failover capability.
What should I do if I get this PAS-C01 question wrong?
Review elastic IP, then practise related PAS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Elastic IP
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Last reviewed: Jun 20, 2026
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