Question #1393
A company operates four business applications in separate VPCs within the ap-southeast-1 Region. These applications require communication between VPCs and must consistently transfer terabytes of data daily to a latency-sensitive application hosted in an on-premises data center. A solutions architect needs to design a network connectivity solution that maximizes cost-effectiveness. Which solution meets these requirements?
Configure four AWS Site-to-Site VPN connections from the data center to AWS, establishing one VPN connection for each VPC.
Deploy a third-party virtual router appliance in each VPC and create IPsec VPN tunnels between the data center and each appliance.
Set up four AWS Direct Connect connections from the data center to a Direct Connect gateway in ap-southeast-1, configuring each VPC to use a dedicated connection.
Establish a single AWS Direct Connect connection from the data center to AWS. Create a transit gateway, attach all VPCs to it, and connect the Direct Connect connection to the transit gateway.
Explanation
Answer D is correct because:
1. Direct Connect offers a dedicated, high-bandwidth connection ideal for latency-sensitive, high-volume data transfers (terabytes daily).
2. Transit Gateway simplifies inter-VPC communication by centralizing routing, eliminating the need for multiple VPNs or Direct Connect connections.
3. Cost-effectiveness: A single Direct Connect connection shared across all VPCs via Transit Gateway is cheaper than maintaining multiple connections (Options A, C) or third-party appliances (Option B).
Why other options are incorrect:
- A: Four VPNs incur higher costs, internet-based latency, and management overhead.
- B: Third-party appliances add complexity, cost, and rely on VPNs (higher latency).
- C: Four Direct Connect connections are prohibitively expensive and unnecessary.
Key Points:
- Use Transit Gateway for scalable inter-VPC connectivity.
- Direct Connect is optimal for large, consistent data transfers with low latency.
- Consolidate connections to reduce costs.
Answer
The correct answer is: D