PROFESSIONAL-CLOUD-NETWORK-ENGINEER Question #221: Real Exam Question with Answer & Explanation

Question

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?

Options

• ACreate custom routes at the Cloud Router in the spokes to advertise the subnets of the VPC
• BCreate custom routes at the Cloud Router in the hub to advertise the subnets of the VPC spokes.
• CCreate a BGP route policy at the Cloud Router, and ensure the subnets of the VPC spokes are
• DCreate custom learned routes at the Cloud Router in the hub to advertise the subnets of the VPC

Explanation

In a hub-and-spoke topology using VPC Network Peering, routes from spoke VPCs are not automatically exported into the hub's Cloud Router BGP sessions-VPC Peering does not provide transitive routing. To advertise spoke subnet routes to on-premises through the hub's Cloud Router, you must create a BGP route policy on the Cloud Router that explicitly includes the spoke subnet prefixes in its route advertisements. Option B refers to 'custom routes,' which are static routes and do not apply here. Option A creates routes in the spokes, which would not reach the hub's Cloud Router. Option D refers to 'custom learned routes,' which is not the correct mechanism for advertisement.

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