Oracle Cloud Infrastructure 2020 Architect Associate — Question 7

You are deploying a highly available web application in Oracle Cloud Infrastructure and have decided to use a public load balancer. The back-end web servers will be distributed across all three availability domains (ADs).
How many subnets should you create to deliver a secure, highly available application?

Answer options

• A. two subnets in total; one regional private subnet to host your back-end web servers and one regional public subnet to host your public load load balancer.
• B. one subnet in total; one regional private subnet to host your back-end web servers and your public load balancer.
• C. three subnets in total; one regional public subnet to host your back-end web servers and two AD specific private subnets to host your private load load balancer.
• D. two subnets in total; one regional public subnet to host your back-end web servers and one regional private subnet to host your public load load balancer.

Correct answer: A

Explanation

The correct choice is A because it provides a secure setup with a private subnet for the back-end servers and a public subnet for the load balancer, ensuring high availability across the availability domains. Option B is incorrect as it lacks a public subnet for the load balancer. Option C is incorrect because it inaccurately assigns a public subnet to the back-end servers, which should be in a private subnet, while option D incorrectly places the load balancer in a private subnet.