- A
An Application Load Balancer to distribute traffic between HANA nodes.
Why wrong: HANA uses direct client connections; ALB is not used.
- B
A VPN connection between the two Availability Zones.
Why wrong: AWS internal networking between AZs does not require VPN.
- C
An ENSA2 (Enqueue Replication 2) enqueue server.
ENSA2 provides high availability for the enqueue service.
- D
A secondary HANA instance in a different Availability Zone.
Provides redundancy across AZs.
- E
A cluster manager such as Pacemaker to orchestrate failover.
Pacemaker monitors and automates failover.
Question 1,126 of 1,733
SAP HANA Multi-Node HA Components
This PAS-C01 practice question tests your understanding of technology. 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. 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 has a mission-critical SAP S/4HANA system running on AWS with a multi-node HANA database. The system must be highly available with an RPO of 0 and an RTO of less than 30 minutes. The database uses SAP HANA System Replication (HSR) with synchronous replication. Which THREE components are essential for this high-availability architecture?
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
✓
An ENSA2 (Enqueue Replication 2) enqueue server.
Option C is correct because SAP S/4HANA with a multi-node HANA database requires the ENSA2 (Enqueue Replication 2) enqueue server to replicate the application-level lock table synchronously between the active and standby central services (ASCS and ERS) instances. This ensures that in the event of a failover, the enqueue locks are preserved, preventing data inconsistencies and enabling a seamless transition within the required RTO of less than 30 minutes.
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.
- ✗
An Application Load Balancer to distribute traffic between HANA nodes.
Why it's wrong here
HANA uses direct client connections; ALB is not used.
- ✗
A VPN connection between the two Availability Zones.
Why it's wrong here
AWS internal networking between AZs does not require VPN.
- ✓
An ENSA2 (Enqueue Replication 2) enqueue server.
Why this is correct
ENSA2 provides high availability for the enqueue service.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
A secondary HANA instance in a different Availability Zone.
Why this is correct
Provides redundancy across AZs.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
A cluster manager such as Pacemaker to orchestrate failover.
Why this is correct
Pacemaker monitors and automates failover.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common misconception is that an Application Load Balancer is needed for database-level high availability, but in SAP HANA HSR, the replication is handled directly between database nodes, and traffic distribution is not a requirement for the database tier.
Detailed technical explanation
How to think about this question
SAP HANA System Replication (HSR) with synchronous replication ensures zero data loss (RPO=0) by committing transactions only after the standby node acknowledges receipt. The ENSA2 enqueue server, introduced with SAP NetWeaver 7.40, replicates the lock table to the standby ASCS instance via the enqueue replication protocol, which is critical for maintaining application consistency during a failover. Pacemaker, as a cluster manager, monitors the HANA database and ASCS/ERS services, and triggers automated failover by moving virtual IPs and starting services on the standby node, typically completing within seconds to meet the sub-30-minute RTO.
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.
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
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.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
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: An ENSA2 (Enqueue Replication 2) enqueue server. — Option C is correct because SAP S/4HANA with a multi-node HANA database requires the ENSA2 (Enqueue Replication 2) enqueue server to replicate the application-level lock table synchronously between the active and standby central services (ASCS and ERS) instances. This ensures that in the event of a failover, the enqueue locks are preserved, preventing data inconsistencies and enabling a seamless transition within the required RTO of less than 30 minutes.
What should I do if I get this PAS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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