Answer: Same VPC

## Explanation When two subnets need to communicate internally without any additional configuration, they must be in the **same VPC (Virtual Private Cloud)**. ### Why this is correct: 1. **Same VPC**: Subnets within the same VPC can communicate with each other by default without any additional configuration. This is because they share the same network space and routing is automatically configured. ### Why other options are incorrect: - **A) VPN**: VPNs are used for secure connections between different networks or to connect on-premises networks to the cloud, not for internal communication within the same cloud environment without configuration. - **B) VPC Peering**: VPC peering is required when you need to connect two different VPCs together. This requires explicit configuration and setup. - **D) Cloud Router**: Cloud Router is a managed service that enables dynamic routing between Google Cloud networks and on-premises networks, not for enabling communication between subnets within the same VPC. ### Key Concept: In Google Cloud VPC, subnets within the same VPC can communicate with each other using internal IP addresses without any additional configuration. This is a fundamental feature of VPC networking that allows for easy intra-VPC communication.

Author: Rodrigo Sales