The correct answer is to implement an SAP ASCS/ERS cluster using two EC2 instances and a shared file system. This is because SAP Central Services (SCS) is a stateful, single-point-of-failure component that requires an active-passive cluster architecture, where the ASCS instance runs on one node and the Enqueue Replication Server (ERS) on the other, with shared storage like Amazon EBS Multi-Attach or Amazon FSx for Windows to maintain quorum and state. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding that high availability for SCS cannot rely on RDS (which is for the database layer only) or simple snapshots, and that a load balancer is irrelevant for SAP proprietary protocols. A common trap is confusing the database layer’s HA with the application layer’s HA—remember, SCS needs its own cluster. Memory tip: “ASCS/ERS = Two servers, one shared disk, no single point of risk.”
PAS-C01 Technology Practice Question
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 runs its SAP system on AWS and uses a Multi-AZ RDS for Oracle database for the SAP Central Services (SCS) instance. The SCS instance is currently on a single EC2 instance in one Availability Zone. The company wants to ensure high availability for the SCS service. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement an SAP ASCS/ERS cluster using two EC2 instances and a shared file system.
Option A is correct because SAP Central Services can be deployed in an ASCS/ERS cluster using two EC2 instances with shared storage (like EBS Multi-Attach or FSx for Windows) and a floating IP. Option B (RDS for Oracle) can be HA but not for SCS. Option C (single instance with EBS snapshots) does not provide HA. Option D (Application Load Balancer) is for HTTP traffic, not SAP protocols.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Implement an SAP ASCS/ERS cluster using two EC2 instances and a shared file system.
Why this is correct
This is the standard HA setup for SAP Central Services on AWS.
Related concept
Standard ACLs match source addresses.
✗
Place the SCS instance on a larger EC2 instance and use EBS snapshots for recovery.
Why it's wrong here
Snapshots are for backup, not HA.
✗
Use an Application Load Balancer to distribute traffic to multiple SCS instances.
Why it's wrong here
SAP Central Services uses proprietary communication, not HTTP.
✗
Configure the SCS instance on the existing RDS for Oracle database.
Why it's wrong here
SCS is a separate service, not part of the database.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
Technology — This question tests Technology — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Implement an SAP ASCS/ERS cluster using two EC2 instances and a shared file system. — Option A is correct because SAP Central Services can be deployed in an ASCS/ERS cluster using two EC2 instances with shared storage (like EBS Multi-Attach or FSx for Windows) and a floating IP. Option B (RDS for Oracle) can be HA but not for SCS. Option C (single instance with EBS snapshots) does not provide HA. Option D (Application Load Balancer) is for HTTP traffic, not SAP protocols.
What should I do if I get this PAS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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