Google Cloud Professional Cloud Network Engineer — Question 210

Your organization has a hub and spoke architecture with VPC Network Peering, and hybrid connectivity is centralized at the hub. The Cloud Router in the hub VPC is advertising subnet routes, but the on-premises router does not appear to be receiving any subnet routes from the VPC spokes. You need to resolve this issue. What should you do?

Answer options

• A. Create custom routes at the Cloud Router in the spokes to advertise the subnets of the VPC spokes.
• B. Create custom routes at the Cloud Router in the hub to advertise the subnets of the VPC spokes.
• C. Create a BGP route policy at the Cloud Router, and ensure the subnets of the VPC spokes are being announced towards the on-premises environment.
• D. Create custom learned routes at the Cloud Router in the hub to advertise the subnets of the VPC spokes.

Correct answer: B

Explanation

The correct answer is B because the Cloud Router in the hub needs to explicitly advertise the routes of the spoke subnets to ensure they are communicated to the on-premises router. Options A and D are incorrect because they focus on the spokes rather than the hub, and C is not necessary as the hub should already be advertising the routes without requiring a specific BGP policy.