ANS-C01 Network Implementation Practice Question
A company is implementing a hybrid network architecture with an AWS Transit Gateway connecting multiple VPCs and an on-premises data center via AWS Direct Connect. The company needs to ensure that traffic between VPCs is inspected by a centralized security appliance running on EC2 instances in a dedicated inspection VPC. To achieve this, traffic must be routed through the inspection VPC before reaching its destination. Which TWO configurations are required? (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
✓
Create a blackhole route in the Transit Gateway route table for the VPC CIDR blocks that are destined for other VPCs.
To force traffic between VPCs through a centralized inspection VPC, you need to prevent direct communication between VPCs and instead route traffic via the inspection VPC. Option B creates a blackhole route in the Transit Gateway route table for the VPC CIDR blocks destined for other VPCs. This drops traffic that would otherwise be directly forwarded between VPCs, forcing it to go through the inspection VPC. Option C adds a static route in the inspection VPC's route tables pointing to the Transit Gateway for all other VPC CIDRs. This ensures that traffic entering the inspection VPC is forwarded to the Transit Gateway and then to the destination VPC. Option A is incorrect because enabling route propagation would automatically advertise VPC routes, allowing direct VPC-to-VPC communication. Option D is incorrect because a VPC Gateway Endpoint is used for private access to AWS services (like S3 or DynamoDB), not for inter-VPC traffic inspection. Option E is incorrect because a NAT gateway is used for outbound internet traffic, not for routing traffic between VPCs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable route propagation for all VPC attachments in the Transit Gateway route table.
Why it's wrong here
Propagation automatically adds routes, but doesn't force inspection.
- ✓
Create a blackhole route in the Transit Gateway route table for the VPC CIDR blocks that are destined for other VPCs.
Why this is correct
Prevents direct routing between VPCs.
- ✓
Add a static route in the inspection VPC route tables pointing to the Transit Gateway for all other VPC CIDRs.
Why this is correct
Sends traffic from inspection VPC to Transit Gateway for onward delivery.
- ✗
Configure a VPC Gateway Endpoint for the inspection VPC to attract traffic.
Why it's wrong here
Gateway endpoints are for S3/DynamoDB, not inter-VPC routing.
- ✗
Deploy a NAT gateway in each VPC to route traffic through the inspection VPC.
Why it's wrong here
NAT gateway is for outbound internet access.
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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JA
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.