- A
A VPC endpoint for Amazon S3.
Correct: Allows Glue jobs in VPC to access S3 without Internet.
- B
An AWS Glue connection object that specifies the VPC, subnet, and security group.
Correct: Required to run Glue jobs within the VPC.
- C
A NAT gateway in a public subnet.
Why wrong: Incorrect: NAT gateway is an alternative, but VPC endpoint is preferred.
- D
An Internet gateway attached to the VPC.
Why wrong: Incorrect: Not required and less secure.
- E
An S3 bucket policy that allows access from the Glue service principal.
Why wrong: Incorrect: Bucket policy is not directly related to VPC access.
Question 1,227 of 1,755
MLS-C01 Data Engineering Practice Question
This MLS-C01 practice question tests your understanding of data engineering. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which TWO configurations are required to enable AWS Glue to access data stored in a VPC? (Choose two.)
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.
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.
- ✓
A VPC endpoint for Amazon S3.
Why this is correct
Correct: Allows Glue jobs in VPC to access S3 without Internet.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A NAT gateway in a public subnet.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that 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.
Detailed technical explanation
How to think about this question
When AWS Glue runs in a VPC, it uses elastic network interfaces (ENIs) in the specified subnets, and traffic to S3 must go through a VPC endpoint (gateway type for S3) to avoid routing through the internet. The Glue connection object stores the VPC, subnet, and security group details, which Glue uses to create these ENIs; without it, Glue cannot launch resources inside the VPC. A common real-world scenario is when Glue needs to access both S3 and a JDBC data source in a private subnet, requiring both a VPC endpoint for S3 and a Glue connection for the JDBC source.
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 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.
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 |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Data Engineering — This question tests Data Engineering — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this MLS-C01 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: Jul 4, 2026
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