The answer is that the floating IP address is not configured to move to the ERS instance. In a Multi-AZ SAP ASCS/ERS deployment on AWS, the Enqueue Replication Server relies on a floating IP—typically an Elastic IP or a Route 53 failover record—that must transition from the ASCS to the ERS during failover. Without this floating IP correctly assigned to the ERS, the enqueue service cannot be taken over, leaving the system unable to resume lock management. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of how SAP’s enqueue replication architecture depends on IP mobility rather than DNS or health checks alone. A common trap is assuming DNS resolution or instance health is the primary mechanism, but the core requirement is the floating IP handoff. Memory tip: think “Floating IP = Failover Key” — if the IP doesn’t float, the ERS won’t follow.
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.
An SAP system on AWS is using a Multi-AZ deployment for high availability. The SAP Central Services (ASCS) and Enqueue Replication Server (ERS) are running on separate EC2 instances. During a failover test, the ASCS instance fails, but the ERS does not take over. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The floating IP address is not configured to move to the ERS instance
SAP Enqueue Replication requires a floating IP address (using AWS Elastic IP or Route 53) that moves from ASCS to ERS during failover. If the floating IP is not properly configured, the ERS cannot take over. DNS resolution is not the primary method. Health checks are not the issue. Instance type is irrelevant.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The ERS instance does not have the required security group rules
Why it's wrong here
Security groups may block traffic but would not prevent the ERS from taking over the role.
✗
The DNS TTL is set too high
Why it's wrong here
DNS is not used for SAP enqueue replication failover.
✗
The ERS instance is in a different subnet
Why it's wrong here
Subnet difference does not prevent failover if routing is correct.
✓
The floating IP address is not configured to move to the ERS instance
Why this is correct
Without floating IP reassignment, clients cannot reach the ERS.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Technology — This question tests Technology — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: The floating IP address is not configured to move to the ERS instance — SAP Enqueue Replication requires a floating IP address (using AWS Elastic IP or Route 53) that moves from ASCS to ERS during failover. If the floating IP is not properly configured, the ERS cannot take over. DNS resolution is not the primary method. Health checks are not the issue. Instance type is irrelevant.
What should I do if I get this PAS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PAS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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