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GCP Professional Cloud Security Engineer Practice Question

Your company operates a production VPC with two private subnets in europe-west1. A Cloud Router peers with an HA VPN gateway that connects to the on-premises network, and a Cloud NAT gateway attached to that router was provisioned by using automatic subnet discovery. During testing, developers in subnet app-svc (10.50.2.0/24) can reach the public internet as expected, but database nodes in subnet db-svc (10.50.3.0/24) are also being NATed, violating a policy that forbids internet access from db-svc. Which configuration change best enforces the policy while continuing to use the same NAT IP addresses for app-svc only?

  • Disable Private Google Access on the db-svc subnet so its instances cannot reach external addresses.

  • Create a high-priority egress firewall rule on the db-svc subnet that denies traffic to 0.0.0.0/0.

  • Deploy a second Cloud NAT gateway dedicated to db-svc and configure it with no external IP addresses.

  • Reconfigure the existing Cloud NAT gateway to use manual (custom) subnetworks mode and include only the app-svc subnet's primary range.

GCP Professional Cloud Security Engineer
Securing communications and establishing boundary protection
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