GCP Professional Cloud Security Engineer Practice Question

Your security team found that on-premises servers connected to your Google Cloud VPC over HA VPN can reach public Google services such as YouTube, even though the only business requirement is to download build artifacts from Cloud Storage. The subnet used by the Cloud VPN tunnel already has Private Google Access for on-premises hosts enabled, and a custom route (199.36.153.4/30) plus a private DNS zone mapping *.googleapis.com to private.googleapis.com is in place. You must block access to Google services that are not protected by VPC Service Controls, while still allowing private access to Cloud Storage, with minimal configuration changes. What should you do?

Change the private DNS record to resolve *.googleapis.com to restricted.googleapis.com and update the Cloud VPN custom route to advertise 199.36.153.8/30 instead of 199.36.153.4/30.
Attach a global external HTTP(S) load balancer with Cloud Armor to the subnet and block requests to unwanted Google services with WAF rules.
Create a Private Service Connect endpoint for Cloud Storage in the VPC, then disable Private Google Access on the subnet.
Replace Private Google Access with a Cloud NAT gateway and restrict egress to Cloud Storage's public IP ranges by firewall rules.

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Answer Description

The VIP 199.36.153.4/30 that backs private.googleapis.com exposes the full set of Google APIs, including consumer services like YouTube. Switching to restricted.googleapis.com (199.36.153.8/30) limits reachable endpoints to the subset of Google APIs that are supported by VPC Service Controls, such as Cloud Storage, and automatically blocks access to consumer services outside that list. Because the subnet already has Private Google Access for on-premises hosts enabled, only the DNS and route need to be updated-no additional infrastructure (such as Private Service Connect or Cloud NAT) is required. Private Service Connect could also provide per-service access control but introduces extra configuration and cost. Firewall rules or Cloud NAT cannot filter traffic once it is inside Google's network and therefore cannot guarantee blocking other Google APIs.

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