- A
Use an internet gateway and a route table that directs traffic to the internet gateway, and use network ACLs to allow only S3 IP ranges [wrong]
Why wrong: Using an internet gateway and network ACLs to allow only S3 IP ranges is not secure because S3 IP ranges can change and traffic goes through the internet.
- B
Configure a NAT gateway in the public subnet and update the route table to send traffic to the NAT gateway, then use security groups to restrict outbound traffic [wrong]
This is a correct method. It uses a NAT gateway to provide internet access to private subnet instances and security groups to restrict outbound traffic to S3. This is a secure approach, though it requires internet access.
- C
Use a VPC endpoint for S3 and attach a security group to the endpoint that allows only HTTPS traffic to the S3 prefix list [wrong]
Why wrong: Using a VPC endpoint for S3 with security group attachment is not sufficient because the security group on the endpoint only controls inbound traffic to the endpoint, not outbound from instances.
- D
Create a gateway VPC endpoint for S3, attach a bucket policy that allows access only from the VPC endpoint, and use a VPC endpoint policy to restrict actions to the specific bucket [CORRECT]
This is the most secure option because it uses a gateway VPC endpoint that keeps traffic within AWS, and uses both VPC endpoint policy and bucket policy for fine-grained access control.
SOA-C02 Gateway VPC Endpoint Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. 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. A key principle to apply: gateway VPC Endpoint. 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 public and private subnet. The security team wants to restrict outbound traffic from EC2 instances in the private subnet to only allow traffic to an S3 bucket in the same account. Which of the following is the MOST secure way to achieve this?
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
Configure a NAT gateway in the public subnet and update the route table to send traffic to the NAT gateway, then use security groups to restrict outbound traffic [wrong]
The question asks for the MOST secure way to restrict outbound traffic from private subnet EC2 instances to only an S3 bucket in the same account. Option D is the most secure because it uses a gateway VPC endpoint for S3, which keeps all traffic within the AWS network and does not require an internet gateway. The VPC endpoint policy restricts actions to the specific bucket, and the bucket policy allows only requests from the VPC endpoint, providing granular security. Option B also works by using a NAT gateway and security groups, but it requires traffic to go through the internet, which is less secure. Therefore, D is the best answer.
Key principle: Gateway VPC Endpoint
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use an internet gateway and a route table that directs traffic to the internet gateway, and use network ACLs to allow only S3 IP ranges [wrong]
Why it's wrong here
Using an internet gateway and network ACLs to allow only S3 IP ranges is not secure because S3 IP ranges can change and traffic goes through the internet.
- ✓
Configure a NAT gateway in the public subnet and update the route table to send traffic to the NAT gateway, then use security groups to restrict outbound traffic [wrong]
- ✗
Use a VPC endpoint for S3 and attach a security group to the endpoint that allows only HTTPS traffic to the S3 prefix list [wrong]
Why it's wrong here
Using a VPC endpoint for S3 with security group attachment is not sufficient because the security group on the endpoint only controls inbound traffic to the endpoint, not outbound from instances.
- ✓
Create a gateway VPC endpoint for S3, attach a bucket policy that allows access only from the VPC endpoint, and use a VPC endpoint policy to restrict actions to the specific bucket [CORRECT]
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may incorrectly think that a NAT gateway combined with security groups is the most secure, but a VPC endpoint with appropriate policies provides better security by keeping traffic within the AWS network.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Gateway VPC Endpoint
- VPC Endpoint Policy
- Bucket Policy
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
Gateway VPC Endpoint
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.
Review gateway VPC Endpoint, then practise related SOA-C02 questions on the same topic to reinforce the concept.
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Security and Compliance — study guide chapter
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Security and Compliance — This question tests Security and Compliance — Gateway VPC Endpoint.
What is the correct answer to this question?
The correct answer is: Configure a NAT gateway in the public subnet and update the route table to send traffic to the NAT gateway, then use security groups to restrict outbound traffic [wrong] — The question asks for the MOST secure way to restrict outbound traffic from private subnet EC2 instances to only an S3 bucket in the same account. Option D is the most secure because it uses a gateway VPC endpoint for S3, which keeps all traffic within the AWS network and does not require an internet gateway. The VPC endpoint policy restricts actions to the specific bucket, and the bucket policy allows only requests from the VPC endpoint, providing granular security. Option B also works by using a NAT gateway and security groups, but it requires traffic to go through the internet, which is less secure. Therefore, D is the best answer.
What should I do if I get this SOA-C02 question wrong?
Review gateway VPC Endpoint, then practise related SOA-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Gateway VPC Endpoint
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Last reviewed: Jun 20, 2026
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