A campus needs 10 Gbps on-prem connectivity to GCP with lowest latency and centralized network administration. Departments require on-prem connectivity to their projects. For cost-efficient interconnect, what do you do?

Using Shared VPC with Dedicated Interconnect and VLAN attachments in the host project is the most cost-efficient and administratively streamlined solution. Shared VPC allows service projects to access network resources, including the Dedicated Interconnect, managed centrally in the host project. This avoids the cost and complexity of deploying multiple Interconnects. Deploying VLAN attachments in the host project ensures centralized management and consistent connectivity for all service projects. Incorrect options: Deploying VLAN attachments in service projects within Shared VPC is less efficient as it distributes management and can complicate routing. Using standalone projects with individual Interconnects and VLAN attachments is significantly more expensive and complex to manage, as each project would require its own physical connection and associated infrastructure.