ANS-C01 Network Security, Compliance and Governance Practice Question
A company has a VPC with a CIDR of 10.0.0.0/16. The VPC contains 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 use a VPC endpoint for S3. Which TWO configurations are required?
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 an endpoint policy that allows access to the S3 bucket.
To access S3 from a private subnet using a VPC endpoint, two configurations are required. First, an endpoint policy must be created (Option B is correct) to control which S3 buckets and actions are allowed. Second, a route must be added in the private subnet's route table pointing to the gateway endpoint (Option D is correct) to direct S3 traffic through the endpoint. Option A is incorrect because assigning a public IP to the EC2 instance is not needed; the endpoint provides private connectivity. Option C is incorrect because a NAT gateway is not required when using a VPC endpoint. Option E is incorrect because gateway endpoints do not use security groups; they use endpoint policies for access control.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Assign a public IP address to the EC2 instance.
Why it's wrong here
The instance is in a private subnet and does not need a public IP for S3 access via endpoint.
- ✓
Create an endpoint policy that allows access to the S3 bucket.
Why this is correct
The endpoint policy controls which resources can be accessed via the endpoint.
- ✗
Deploy a NAT gateway in the public subnet.
Why it's wrong here
A NAT gateway is not needed when using a VPC endpoint for S3.
- ✓
Add a route in the private subnet's route table pointing to the gateway endpoint.
Why this is correct
The route table must have a route to the endpoint for traffic to reach S3 via the endpoint.
- ✗
Attach a security group to the gateway endpoint.
Why it's wrong here
Gateway endpoints do not have security groups; they use endpoint policies.
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
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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