This PAS-C01 practice question tests your understanding of design of sap workloads on aws. 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 administrator needs to ensure high availability for SAP NetWeaver ABAP stack on AWS. Which three components should be configured in a multi-AZ active/passive cluster? (Select THREE.)
Enqueue Replication Server (ERS).
ERS works with ASCS for failover.
ABAP SAP Central Services (ASCS).
ASCS is a single point of failure and must be clustered.
Database instance.
Database is critical and must be highly available.
SAP Gateway.
Why wrong: Gateway is part of the application layer.
Dialog instances.
Why wrong: Dialog instances are stateless and can be spread across AZs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Enqueue Replication Server (ERS).
The Enqueue Replication Server (ERS) is a critical component in an SAP NetWeaver ABAP stack active/passive cluster because it replicates the lock table from the primary ASCS instance to the standby node. In a multi-AZ setup, this ensures that if the primary ASCS fails, the standby can take over with minimal disruption, as the lock state is preserved. Without ERS, a failover would require all locked resources to be released, causing data inconsistencies or application errors.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Enqueue Replication Server (ERS).
Why this is correct
ERS works with ASCS for failover.
Related concept
Read the scenario before looking for a memorised answer.
ABAP SAP Central Services (ASCS).
Why this is correct
ASCS is a single point of failure and must be clustered.
Related concept
Read the scenario before looking for a memorised answer.
Database instance.
Why this is correct
Database is critical and must be highly available.
Related concept
Read the scenario before looking for a memorised answer.
SAP Gateway.
Why it's wrong here
Gateway is part of the application layer.
Dialog instances.
Why it's wrong here
Dialog instances are stateless and can be spread across AZs.
Common exam traps
AWS often tests the misconception that all SAP components must be in an active/passive cluster for high availability, but only stateful components like ASCS, ERS, and the database require this; stateless components like SAP Gateway and Dialog instances can be distributed across AZs in an active/active manner.
Detailed technical explanation
In an SAP NetWeaver ABAP stack, the ASCS instance manages the enqueue (lock) service and message server, while the ERS runs on a separate host to replicate the enqueue table via the enqueue replication protocol (using TCP port 36xx). During a failover, the ERS instance promotes its replicated lock table to become the new primary, ensuring that locks held by active dialog instances are not lost. This is critical in multi-AZ deployments where network latency can affect replication timing, and SAP recommends using a dedicated ERS instance to avoid split-brain scenarios.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Design of SAP Workloads on AWS — This question tests Design of SAP Workloads on AWS — Read the scenario before looking for a memorised answer..
The correct answer is: Enqueue Replication Server (ERS). — The Enqueue Replication Server (ERS) is a critical component in an SAP NetWeaver ABAP stack active/passive cluster because it replicates the lock table from the primary ASCS instance to the standby node. In a multi-AZ setup, this ensures that if the primary ASCS fails, the standby can take over with minimal disruption, as the lock state is preserved. Without ERS, a failover would require all locked resources to be released, causing data inconsistencies or application errors.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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