Oracle Cloud Infrastructure 2020 Architect Professional — Question 36

You are working as a solutions architect for an online retail store in Frankfurt which uses multiple compute instance VMs spread among three availability domains in the eu-frankfurt-1 region. You noticed the website is having very high traffic, so you enabled autoscaling to suffice the needs of your application but, you observed that one of the availability domains is not receiving any traffic.
What could be wrong in this situation? (Choose the best answer.)

Answer options

• A. Autoscaling only works with single availability domains.
• B. You forgot to attach a load balancer to your instance pool configuration.
• C. You have to manually add all three availability domains to your load balancer configuration.
• D. Autoscaling is using an Instance Pool configured to create instances in two availability Domains.
• E. Autoscaling can be enabled for multiple availability domains only in uk-london-1 region.

Correct answer: D

Explanation

The correct answer is D because if the Instance Pool is configured to create instances in only two availability domains, then one domain will not receive traffic. Options A and E are incorrect as autoscaling does support multiple availability domains and is not restricted to the uk-london-1 region. Option B is wrong because the presence of a load balancer does not affect autoscaling across availability domains, and option C is unnecessary since autoscaling can distribute traffic across available domains automatically.