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Answer: Configure the VPC dynamic routing mode to Global.
The default VPC dynamic routing mode is regional, which means subnets' routes are only advertised within their own region. To allow the HA VPN in europe-west4 to access all subnets across regions, the VPC's routing mode must be set to Global. Global dynamic routing ensures all subnet routes are propagated globally, enabling the Cloud Router in europe-west4 to advertise all subnets (including those in us-east1 and us-west4) to the branch office via VPN. Options A and D would not resolve the regional route limitation, and option B is redundant as HA VPN already uses Cloud VPN.
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Your organization has a Google Cloud VPC with subnets in us-east1, us-west4, and europe-west4 using the default VPC configuration. Employees in a European branch office need to access VPC resources via HA VPN. You have set up the HA VPN connected to the VPC with a Cloud Router in europe-west4. How can you ensure branch office users have fast and seamless access to all VPC resources?
A
Create custom advertised routes for each subnet.
B
Configure each subnet’s VPN connections to use Cloud VPN to connect to the branch office.
C
Configure the VPC dynamic routing mode to Global.
D
Set the advertised routes to Global for the Cloud Router.
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