ANS-C01 Network Management and Operations Practice Question
Network Topology
Refer to the exhibit. A company has created a VPC endpoint for S3. However, an EC2 instance in the subnet associated with the route table cannot access S3 via the endpoint. The route table has a route to the endpoint. What is the most likely cause?
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
✓
Private DNS is not enabled
The endpoint policy is set to Allow all, which is fine. However, the PrivateDnsEnabled is false, meaning that DNS resolution for S3 endpoints does not resolve to the endpoint IP. To use the endpoint, either enable Private DNS or use the endpoint-specific DNS name. Option A is wrong because the endpoint state is 'available'. Option B is wrong because the route table is associated. Option D is wrong because the security group is not specified (empty), but default SG allows all outbound traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The endpoint is in 'pending' state
Why it's wrong here
The endpoint state is 'available'.
- ✗
The route table is not associated with the subnet
Why it's wrong here
The route table is associated (RouteTableIds not empty).
- ✓
Private DNS is not enabled
Why this is correct
Without Private DNS, the instance does not resolve S3 to the endpoint IP.
- ✗
The security group is blocking traffic
Why it's wrong here
No security group is attached; default SG allows outbound.
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
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.