- A
Increase the provisioned throughput on the EFS file system to handle the increased load during failover.
Why wrong: Throughput is not the issue; connectivity loss is due to mount target resolution.
- B
Migrate the shared file systems to Amazon FSx for NetApp ONTAP with multi-AZ deployment.
Why wrong: While this could be a long-term solution, it does not address the immediate cause of the disconnection.
- C
Configure EFS mount targets in each AZ and use an EFS access point with a consistent mount path.
This ensures that after failover, the application servers can mount the file system using the access point that resolves in the AZ.
- D
Reconfigure SAP HANA System Replication to use synchronous replication.
Why wrong: Replication mode does not affect file system connectivity.
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.
You are managing an SAP S/4HANA system on AWS. The system uses a multi-AZ deployment with two application servers (one in us-east-1a, one in us-east-1b) and a HANA database in us-east-1a with a standby in us-east-1b using HSR. The /sapmnt and /usr/sap/trans are on an EFS file system. Recently, you noticed that during a failover test of the HANA database, the application servers lost connectivity to the database for several minutes, causing errors. You also observed that after the failover, the application servers could not reconnect until the EFS mount was remounted. What is the most likely cause and solution?
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 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
Configure EFS mount targets in each AZ and use an EFS access point with a consistent mount path.
Option D is correct because the EFS mount target is in a specific subnet, and after failover, the application servers might be trying to connect to the wrong mount target or the DNS might not resolve correctly. Using an EFS access point with a consistent path and ensuring proper DNS resolution across AZs can resolve this. Option A (increase EFS throughput) does not address connectivity. Option B (use FSx for ONTAP) could be an alternative but is not the immediate cause. Option C (HSR setup issue) is not the cause if the database fails over correctly.
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.
- ✗
Increase the provisioned throughput on the EFS file system to handle the increased load during failover.
Why it's wrong here
Throughput is not the issue; connectivity loss is due to mount target resolution.
- ✗
Migrate the shared file systems to Amazon FSx for NetApp ONTAP with multi-AZ deployment.
Why it's wrong here
While this could be a long-term solution, it does not address the immediate cause of the disconnection.
- ✓
Configure EFS mount targets in each AZ and use an EFS access point with a consistent mount path.
Why this is correct
This ensures that after failover, the application servers can mount the file system using the access point that resolves in the AZ.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.
- ✗
Reconfigure SAP HANA System Replication to use synchronous replication.
Why it's wrong here
Replication mode does not affect file system connectivity.
Common exam traps
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Configure EFS mount targets in each AZ and use an EFS access point with a consistent mount path. — Option D is correct because the EFS mount target is in a specific subnet, and after failover, the application servers might be trying to connect to the wrong mount target or the DNS might not resolve correctly. Using an EFS access point with a consistent path and ensuring proper DNS resolution across AZs can resolve this. Option A (increase EFS throughput) does not address connectivity. Option B (use FSx for ONTAP) could be an alternative but is not the immediate cause. Option C (HSR setup issue) is not the cause if the database fails over correctly.
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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Last reviewed: Jun 20, 2026
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