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GCP Professional Cloud Security Engineer Practice Question

Your retail platform is migrating a three-tier application to Google Cloud. Customer browsers must reach the web tier over HTTPS via a single globally routable IP address. Application and database VMs must remain inaccessible from the internet but need to initiate outbound connections to a third-party payment API that only accepts traffic from a fixed IP range you provide. Which design satisfies these requirements while following Google-recommended use of public and private IPs?

  • Give every VM in all three tiers both internal and external IP addresses; block unwanted traffic to the application and database tiers using firewall rules; no load balancer or NAT required.

  • Deploy a regional internal HTTP(S) load balancer with a private front-end address, publish a DNS A record for it on the public internet; give the application and database VMs external IPs so they can reach the payment API without NAT.

  • Attach a global external IP to an external HTTP(S) load balancer front-end; place all web, application, and database instances in subnets with only private addresses; configure a Cloud NAT gateway with a statically reserved public IP for the subnets needing egress.

  • Provision an internal HTTP(S) load balancer and assign public IPs directly to the web tier VMs; leave application and database tiers on private addresses; create Cloud NAT with auto-assigned IPs for outbound calls.

GCP Professional Cloud Security Engineer
Securing communications and establishing boundary protection
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