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.
A company is migrating an SAP ERP system to AWS and needs to ensure high availability for the SAP Central Services (ASCS) and Enqueue Replication Server (ERS). The solution must use a shared file system for the SAP transport directory. Which combination of AWS services should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon EFS for the transport directory and two EC2 instances with a floating IP
Option D is correct because Amazon EFS provides a shared NFS file system for the transport directory, and using two EC2 instances in an active/passive configuration with a floating IP (e.g., via Route 53 or Elastic IP reassignment) provides high availability for ASCS/ERS. Option A is incorrect because EBS volumes cannot be attached to multiple instances simultaneously. Option B is incorrect because S3 is not a POSIX-compliant file system for SAP. Option C is incorrect because Amazon FSx for Windows File Server is for Windows workloads, not Linux SAP.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Amazon FSx for Windows File Server for the transport directory
Why it's wrong here
FSx for Windows is not suitable for Linux-based SAP systems.
✗
Amazon S3 as the transport directory with two application servers
Why it's wrong here
S3 does not support POSIX file locking required by SAP transport.
✓
Amazon EFS for the transport directory and two EC2 instances with a floating IP
Why this is correct
EFS provides shared NFS; floating IP enables failover for ASCS/ERS.
Related concept
Static NAT maps one inside address to one outside address.
✗
Amazon EBS volumes attached to both ASCS and ERS instances
Why it's wrong here
EBS volumes cannot be attached to multiple instances for shared access.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Amazon EFS for the transport directory and two EC2 instances with a floating IP — Option D is correct because Amazon EFS provides a shared NFS file system for the transport directory, and using two EC2 instances in an active/passive configuration with a floating IP (e.g., via Route 53 or Elastic IP reassignment) provides high availability for ASCS/ERS. Option A is incorrect because EBS volumes cannot be attached to multiple instances simultaneously. Option B is incorrect because S3 is not a POSIX-compliant file system for SAP. Option C is incorrect because Amazon FSx for Windows File Server is for Windows workloads, not Linux SAP.
What should I do if I get this PAS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PAS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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