- A
Create a VPC Interface Endpoint for S3 and associate it with the private subnet
Why wrong: Interface Endpoint is not supported for S3; S3 uses Gateway Endpoints.
- B
Create a NAT Gateway in the public subnet and add a route in the private subnet route table pointing to the NAT Gateway
Why wrong: NAT Gateway uses the internet, not private connectivity.
- C
Create a VPC Gateway Endpoint for S3 and add a route in the private subnet route table pointing to the endpoint
Gateway Endpoint provides private access to S3.
- D
Set up an AWS Direct Connect connection and use a private virtual interface
Why wrong: Direct Connect is overkill for in-region S3 access and still requires a VPC endpoint.
Question 998 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 company has a VPC with a CIDR block of 10.0.0.0/16. It has a public subnet (10.0.1.0/24) and a private subnet (10.0.2.0/24). An EC2 instance in the private subnet needs to access an S3 bucket. The company wants to ensure that traffic to S3 does not traverse the internet. Which solution should be used?
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
✓
Create a VPC Gateway Endpoint for S3 and add a route in the private subnet route table pointing to the endpoint
Option C is correct because a VPC Gateway Endpoint for S3 allows private subnet resources to access S3 without traversing the internet, using AWS's internal network. By adding a route in the private subnet's route table pointing to the gateway endpoint (prefix list for S3), traffic destined for S3 stays within the AWS network, meeting the requirement to avoid internet transit.
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.
- ✗
Create a VPC Interface Endpoint for S3 and associate it with the private subnet
Why it's wrong here
Interface Endpoint is not supported for S3; S3 uses Gateway Endpoints.
- ✗
Create a NAT Gateway in the public subnet and add a route in the private subnet route table pointing to the NAT Gateway
- ✓
Create a VPC Gateway Endpoint for S3 and add a route in the private subnet route table pointing to the endpoint
Why this is correct
Gateway Endpoint provides private access to S3.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set up an AWS Direct Connect connection and use a private virtual interface
Why it's wrong here
Direct Connect is overkill for in-region S3 access and still requires a VPC endpoint.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Interface Endpoints (powered by AWS PrivateLink) with Gateway Endpoints, assuming S3 supports Interface Endpoints, but S3 only supports Gateway Endpoints (and later, Gateway Load Balancer endpoints, not Interface Endpoints).
Detailed technical explanation
How to think about this question
A VPC Gateway Endpoint uses prefix lists and route table entries to direct S3 traffic over the AWS backbone, bypassing internet gateways and NAT devices. The endpoint is horizontally scaled, redundant, and highly available by default, and it supports policies to control access. In real-world scenarios, this is critical for compliance (e.g., HIPAA, PCI DSS) where data must not leave the AWS network.
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 ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a VPC Gateway Endpoint for S3 and add a route in the private subnet route table pointing to the endpoint — Option C is correct because a VPC Gateway Endpoint for S3 allows private subnet resources to access S3 without traversing the internet, using AWS's internal network. By adding a route in the private subnet's route table pointing to the gateway endpoint (prefix list for S3), traffic destined for S3 stays within the AWS network, meeting the requirement to avoid internet transit.
What should I do if I get this ANS-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
This ANS-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 ANS-C01 exam.
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