A customer is running an analytics workload on Google Cloud Platform (GCP) where Compute Engine instances are accessing data stored on Cloud Storage. Your team wants to make sure that this workload…

Configuring Private Google Access on the subnet allows Compute Engine instances without public IP addresses to securely access Google services, such as Cloud Storage, using internal IP addresses, thereby preventing internet egress for these interactions.

Avoiding public IP addresses on Compute Engine instances ensures they cannot be directly accessed from the internet and cannot initiate outbound connections to the internet without additional mechanisms like Cloud NAT, fulfilling the requirement of isolation from the internet.

Running on a separate subnet provides network segmentation within the VPC but does not inherently prevent internet access or access from the internet if public IPs are assigned or default routes allow it.

Turning off IP forwarding on Compute Engine instances prevents them from acting as routers for other instances but does not restrict their own internet access or ingress from the internet.

Configuring a Cloud NAT gateway enables instances without public IP addresses to initiate outbound connections to the internet, which directly contradicts the requirement to prevent any internet access.