GCP Professional Cloud Architect Practice Question
Your company is building a hybrid network between its on-premises data center (which already runs BGP) and a new Google Cloud VPC. Two redundant HA VPN tunnels will connect the environments. The networking team wants any new on-prem subnets to become reachable from Google Cloud automatically, and any new VPC subnets to be advertised back without having to create or update static routes. What should you configure in Google Cloud to meet this requirement?
Configure custom static routes for every on-premises and VPC subnet on the Cloud VPN gateways and on the on-premises routers.
Deploy a third-party BGP-capable virtual appliance in a Compute Engine instance and route traffic through it instead of using Cloud Router.
Create a Cloud Router in the VPC and associate it with both HA VPN tunnels so that Border Gateway Protocol can automatically exchange routes between networks.
Enable automatic subnet creation in the VPC and rely on the default Internet gateway to discover new routes dynamically.
Cloud Router integrates with both Classic VPN and HA VPN as well as Cloud Interconnect. When you attach a Cloud Router to each VPN tunnel, the router establishes BGP sessions with the on-premises peer devices. Through these sessions it automatically advertises all eligible VPC subnet routes to the on-premises network and learns routes that the on-premises routers advertise, inserting them into the VPC routing table. This eliminates the need to maintain individual static routes and ensures that any newly created subnet on either side is propagated without manual changes. Relying on default routes, using only static routes, or introducing an additional third-party BGP appliance are unnecessary and would not satisfy the requirement for native, automated route exchange within Google Cloud.
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What is BGP and how does it work with Cloud Router?
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What is the difference between static routes and BGP routes in this setup?
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Why is a Cloud Router necessary for HA VPN tunnels?
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What is a Cloud Router in Google Cloud?
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What is BGP and how does it help in hybrid networking?
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What is HA VPN and how does it differ from Classic VPN in Google Cloud?
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GCP Professional Cloud Architect
Managing and provisioning a solution infrastructure
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