MLS-C01 Data Engineering Practice Question
Which TWO configurations are required to enable AWS Glue to access data stored in a VPC? (Choose two.)
⚠ Common exam trap
Candidates often think a NAT gateway or Internet gateway is needed for Glue to access S3 from within a VPC, but AWS Glue can use a VPC endpoint for S3 to keep traffic private and avoid internet routing.
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
✓
A VPC endpoint for Amazon S3.
A VPC endpoint for Amazon S3 (Option A) is required because it allows AWS Glue to access S3 data privately over the AWS network without traversing the public internet, which is necessary when Glue runs inside a VPC. An AWS Glue connection object (Option B) is required because it defines the VPC, subnet, and security group that Glue will use to launch its resources within the VPC, enabling it to access data stores in that VPC.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A VPC endpoint for Amazon S3.
Why this is correct
Correct: Allows Glue jobs in VPC to access S3 without Internet.
- ✓
An AWS Glue connection object that specifies the VPC, subnet, and security group.
Why this is correct
Correct: Required to run Glue jobs within the VPC.
- ✗
A NAT gateway in a public subnet.
Why it's wrong here
Incorrect: NAT gateway is an alternative, but VPC endpoint is preferred.
- ✗
An Internet gateway attached to the VPC.
Why it's wrong here
Incorrect: Not required and less secure.
- ✗
An S3 bucket policy that allows access from the Glue service principal.
Why it's wrong here
Incorrect: Bucket policy is not directly related to VPC access.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
Related to this question
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MLS-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 MLS-C01 exam.