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Difficulty: MediumConfiguring Network Topology and VPC Infrastructure

An online retail organization operates workloads across two regions using a single Virtual Private Cloud (VPC) network with subnets in us-central1 and europe-west1. On-premises data centers in both regions are connected to Google Cloud via Dedicated Interconnect attachments bound to regional Cloud Routers. The networking team requires that if the Dedicated Interconnect link in europe-west1 fails, on-premises traffic from europe-west1 must automatically fail over to reach workloads in us-central1 via the us-central1 Interconnect path. Which VPC network dynamic routing configuration should you implement to meet this requirement?

  1. Set the VPC network dynamic routing mode to Global so that Cloud Routers advertise all VPC subnets to on-premises routers across all regions.Answer
  2. B
    Establish VPC Network Peering between subnets in us-central1 and europe-west1 so that dynamic BGP routes can be transitively exchanged across regions.
  3. C
    Replace the Dedicated Interconnect in europe-west1 with an HA VPN gateway because Cloud Interconnect connections do not support cross-region dynamic routing.
  4. D
    Configure VPC Service Controls perimeter egress rules to explicitly permit inter-regional BGP route propagation between Cloud Routers.

Answer

Set the VPC network dynamic routing mode to Global so that Cloud Routers advertise all VPC subnets to on-premises routers across all regions.
Configuring the VPC dynamic routing mode to Global enables Cloud Routers in a specific region (such as us-central1) to advertise all subnets within the VPC, including those in other regions, to on-premises routers. This creates high availability and automatic cross-region failover for hybrid connectivity over Dedicated Interconnect.

Step-by-Step Solution

1
Analyze the requirement for multi-region hybrid failover in a single VPC.
Identified that subnets in us-central1 need to be reachable over BGP via the europe-west1 Interconnect connection (and vice versa) in case of link failure.
By default, regional dynamic routing restricts Cloud Routers to advertising only subnets located in the local region of the Cloud Router.
2
Evaluate Google Cloud VPC dynamic routing modes.
Global dynamic routing mode enables Cloud Routers in any region to learn and advertise routes to all subnets across the entire VPC network.
Configuring the VPC dynamic routing mode to Global ensures cross-region route propagation across Cloud Interconnect and Cloud Router endpoints.

Key Concept

VPC Dynamic Routing Modes (Regional vs. Global)
Estimated Time:1m 30s
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Topics

Configuring Network Topology and VPC Infrastructure

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