Oracle Cloud Infrastructure 2020 Architect Professional — Question 12

A retail company runs their online shopping platform entirely on Oracle Cloud Infrastructure (OCI). This is a 3-tier web application that includes a 100 Mbps Load
Balancer, Virtual Machine Instances for web and application tiers, and an Oracle DB Systems Virtual Machine. Due to unprecedented growth, they noticed an increase in the incoming traffic to their website and all users start getting 503 (Service Unavailable) errors.
What is the potential problem in this scenario? (Choose the best answer.)

Answer options

• A. You did not configure a Service Gateway to allow connection between web servers and Load Balancer.
• B. The Traffic Management Policy is not set to Load Balancer the traffic to the web servers.
• C. The Load Balancer health check status indicates critical situation for half of the backend web servers.
• D. The Database is down hence users cannot access the web site.
• E. All the web servers are too busy and not able to answer any request from users.

Correct answer: C

Explanation

The correct answer is C because a critical health status for half of the backend web servers indicates that they are not able to process requests, leading to 503 errors. Option A is incorrect as it deals with connectivity setup rather than server health. Option B incorrectly suggests an issue with the Traffic Management Policy, which is not the cause of the errors. Option D implies a database issue that isn't affecting the web servers directly, and Option E suggests general server overload, but does not address the specific health check status.