Google Cloud Professional Cloud Network Engineer — Question 185

Your company runs an enterprise platform on-premises using virtual machines (VMs). Your internet customers have created tens of thousands of DNS domains pointing to your public IP addresses allocated to the VMs. Typically, your customers hard-code your IP addresses in their DNS records. You are now planning to migrate the platform to Compute Engine and you want to use Bring Your Own IP. You want to minimize disruption to the platform. What should you do?

Answer options

• A. Create a VPC and request static external IP addresses from Google Cloud. Assign the IP addresses to the Compute Engine instances. Notify your customers of the new IP addresses so they can update their DNS records.
• B. Verify ownership of your IP addresses. After the verification, Google Cloud advertises and provisions the IP prefix for you. Assign the IP addresses to the Compute Engine instances.
• C. Create a VPC with the same IP address range as your on-premises network. Assign the IP addresses to the Compute Engine instances.
• D. Verify ownership of your IP addresses. Use live migration to import the prefix. Assign the IP addresses to the Compute Engine instances.

Correct answer: B

Explanation

The correct answer is B because verifying ownership allows Google Cloud to advertise your existing IP addresses, ensuring a seamless transition without needing your customers to update their DNS records. Option A requires notifying customers about new IP addresses, which would lead to unnecessary disruption. Option C does not involve bringing the existing IP addresses, and D's live migration isn't applicable for this scenario since it doesn't facilitate the use of your current IP addresses.