SAA-C03 Question 547
Single answerA company has multiple Amazon VPCs in the same AWS Region that need to communicate with each other. These VPCs are managed by different teams and have overlapping CIDR ranges. Which solution will allow the VPCs to communicate while avoiding IP address conflicts?
- A
Establish VPC peering connections between the VPCs.
- B
Use an AWS Transit Gateway and configure route tables to connect the VPCs.
- C
Use a VPN connection between the VPCs to avoid IP conflicts.
- D
Deploy a Network Load Balancer in each VPC to bridge the communication.
Show answer and explanation
Correct answer: B
Explanation
When VPCs have overlapping CIDR ranges, AWS Transit Gateway is the recommended solution. It uses route tables and supports network address translation (NAT) to enable communication between VPCs without IP conflicts. VPC peering, VPN connections, or load balancers do not provide the capability to handle overlapping CIDRs effectively.
- A. Incorrect.
VPC peering does not support overlapping CIDR ranges, so this option would not work in this scenario.
- B. Correct.
AWS Transit Gateway allows communication between multiple VPCs, even with overlapping CIDRs, by using network address translation (NAT) and route table configurations.
- C. Incorrect.
A VPN connection does not resolve overlapping CIDR range issues and is not the recommended solution for VPC-to-VPC communication within AWS.
- D. Incorrect.
A Network Load Balancer does not address the need for inter-VPC communication or handle overlapping IP ranges.