Quick Answer
The answer is a security group. Amazon EFS relies on security groups as a stateful firewall to control NFS traffic on port 2049 at the network level, which is the correct access option to secure the SAP transport directory. By attaching a security group to the EFS file system, you can restrict mount access to only specific EC2 instances or AWS resources that need to connect, providing granular network-layer security without managing individual IP addresses. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this concept tests your understanding of how to isolate sensitive SAP shared storage using AWS-native network controls, often appearing in scenario-based questions where a customer wants to avoid IP-based allow lists due to dynamic scaling. A common trap is confusing security groups with network ACLs or assuming EFS requires a separate VPN; remember that security groups are stateful and automatically allow return traffic. Memory tip: think “EFS = Elastic Firewall Security” for NFS port 2049.
This PAS-C01 practice question tests your understanding of design of sap workloads on aws. 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 customer is running SAP NetWeaver on AWS and wants to use Amazon EFS for shared file storage for the SAP transport directory. Which access option should be used to secure the file system?
Network ACLs
Why wrong: NACLs are for subnets.
IAM role
Why wrong: IAM roles are not used for EFS mount access.
Security group
EFS uses security groups to allow inbound NFS traffic.
S3 bucket policy
Why wrong: S3 bucket policies are for S3 objects.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Security group
Amazon EFS uses security groups as a stateful firewall to control NFS traffic (port 2049) at the network level. For SAP transport directories, security groups allow you to restrict access to specific EC2 instances or other AWS resources that need to mount the EFS file system, providing granular network-layer security without managing individual IP addresses.
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.
Network ACLs
Why it's wrong here
NACLs are for subnets.
IAM role
Why it's wrong here
IAM roles are not used for EFS mount access.
Security group
Why this is correct
EFS uses security groups to allow inbound NFS traffic.
Related concept
Read the scenario before looking for a memorised answer.
S3 bucket policy
Why it's wrong here
S3 bucket policies are for S3 objects.
Common exam traps
The trap here is that candidates confuse network-level access controls (security groups) with identity-based controls (IAM roles) or assume that EFS, being a shared file system, can be secured with policies similar to S3 bucket policies.
Detailed technical explanation
EFS security groups work by allowing inbound NFS traffic (TCP port 2049) from the security group of the EC2 instance or the source CIDR block. Under the hood, EFS uses NFSv4.1 with Kerberos authentication optionally, but security groups remain the primary mechanism for network access control. In a real-world SAP deployment, you might attach the same security group to both the EFS mount target and the SAP application servers to ensure only those instances can mount the transport directory.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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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: Security group — Amazon EFS uses security groups as a stateful firewall to control NFS traffic (port 2049) at the network level. For SAP transport directories, security groups allow you to restrict access to specific EC2 instances or other AWS resources that need to mount the EFS file system, providing granular network-layer security without managing individual IP addresses.
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 24, 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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