- A
The Lambda function must have the AWSLambdaVPCAccessExecutionRole managed policy attached.
This policy provides permissions to create and manage ENIs, which is essential for Lambda to connect to a VPC and access EFS.
- B
The Lambda function must be in the same Availability Zone as the EFS mount target.
Why wrong: Mount targets are created per AZ, but Lambda can access EFS from any AZ in the same VPC.
- C
The Lambda function must have the AmazonElasticFileSystemClientReadWriteAccess managed policy attached.
Why wrong: While this policy grants data access to EFS, it is not required for mounting; it may be needed for read/write operations.
- D
The Lambda function must have the efs:MountFileSystem permission in its execution role.
Why wrong: The efs:MountFileSystem permission is not used by Lambda; mounting is handled by the EFS client within the runtime environment.
DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is creating an AWS Lambda function that needs to access files from an Amazon EFS file system. The Lambda function must be configured to access the VPC. Which of the following is required to allow the Lambda function to mount the EFS file system?
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
The Lambda function must have the AWSLambdaVPCAccessExecutionRole managed policy attached.
The AWSLambdaVPCAccessExecutionRole managed policy provides the necessary permissions for Lambda to manage elastic network interfaces (ENIs) in a VPC, which is required for Lambda to connect to an EFS file system via mount targets. Without this policy, the Lambda function cannot create or manage the ENI needed to route traffic to the EFS mount target within the VPC.
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.
- ✓
The Lambda function must have the AWSLambdaVPCAccessExecutionRole managed policy attached.
Why this is correct
This policy provides permissions to create and manage ENIs, which is essential for Lambda to connect to a VPC and access EFS.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The Lambda function must be in the same Availability Zone as the EFS mount target.
Why it's wrong here
Mount targets are created per AZ, but Lambda can access EFS from any AZ in the same VPC.
- ✗
The Lambda function must have the AmazonElasticFileSystemClientReadWriteAccess managed policy attached.
Why it's wrong here
While this policy grants data access to EFS, it is not required for mounting; it may be needed for read/write operations.
- ✗
The Lambda function must have the efs:MountFileSystem permission in its execution role.
Why it's wrong here
The efs:MountFileSystem permission is not used by Lambda; mounting is handled by the EFS client within the runtime environment.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the VPC networking permissions required for Lambda to mount EFS (AWSLambdaVPCAccessExecutionRole) with EFS-specific API permissions (AmazonElasticFileSystemClientReadWriteAccess) or a nonexistent efs:MountFileSystem action, leading them to select the wrong policy or permission.
Detailed technical explanation
How to think about this question
When Lambda accesses EFS, it uses the NFSv4.1 protocol over TCP port 2049, and the execution role must have the ec2:CreateNetworkInterface, ec2:DescribeNetworkInterfaces, and ec2:DeleteNetworkInterface permissions (provided by AWSLambdaVPCAccessExecutionRole) to attach the function to the VPC. The EFS mount target must be in a subnet with a network ACL and security group that allows inbound NFS traffic from the Lambda function's security group, and the Lambda function's VPC configuration must include at least one subnet per Availability Zone for high availability.
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 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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Lambda function must have the AWSLambdaVPCAccessExecutionRole managed policy attached. — The AWSLambdaVPCAccessExecutionRole managed policy provides the necessary permissions for Lambda to manage elastic network interfaces (ENIs) in a VPC, which is required for Lambda to connect to an EFS file system via mount targets. Without this policy, the Lambda function cannot create or manage the ENI needed to route traffic to the EFS mount target within the VPC.
What should I do if I get this DVA-C02 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: Jun 11, 2026
This DVA-C02 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 DVA-C02 exam.
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