Google Cloud Professional Cloud Network Engineer — Question 29

Your company's web server administrator is migrating on-premises backend servers for an application to GCP. Libraries and configurations differ significantly across these backend servers. The migration to GCP will be lift-and-shift, and all requests to the servers will be served by a single network load balancer frontend.
You want to use a GCP-native solution when possible.
How should you deploy this service in GCP?

Answer options

• A. Create a managed instance group from one of the images of the on-premises servers, and link this instance group to a target pool behind your load balancer.
• B. Create a target pool, add all backend instances to this target pool, and deploy the target pool behind your load balancer.
• C. Deploy a third-party virtual appliance as frontend to these servers that will accommodate the significant differences between these backend servers.
• D. Use GCP's ECMP capability to load-balance traffic to the backend servers by installing multiple equal-priority static routes to the backend servers.

Correct answer: B

Explanation

The correct answer is B because creating a target pool and adding all backend instances allows for effective management of traffic directed by the load balancer. Option A is incorrect as a managed instance group is not optimal due to the significant differences between backend servers. Option C introduces unnecessary complexity by using a third-party appliance, and option D is not the most efficient way to achieve load balancing in this context.