1Z0-1104-25 Question 74
Select 2Your organization hosts a mission-critical web application on Oracle Cloud Infrastructure across two Availability Domains (ADs) in a single region. To ensure the application remains accessible even if an AD fails, you are configuring an OCI Public Load Balancer. Which two steps must you implement to achieve high availability for this load balancer setup?
- A
Provision the load balancer with at least two subnets, each in a different Availability Domain.
- B
Assign a single public subnet to the load balancer and rely on instance failover at the backend tier only.
- C
Configure an active health check policy for backend servers in both Availability Domains.
- D
Deploy multiple public load balancers�one per Availability Domain�and switch them manually when needed.
Show answer and explanation
Correct answers: A, C
Explanation
In OCI, a highly available public load balancer is deployed using two subnets in different Availability Domains in the same region. Each subnet hosts redundant load balancer components that automatically fail over if one AD is affected. Configuring health checks on backend servers ensures traffic is directed only to healthy instances. Refer to the official OCI Load Balancer documentation for best practices on deploying and configuring high availability features.
- A. Correct.
Correct. OCI requires you to specify two subnets (in different ADs) for a public load balancer. This ensures traffic continues flowing if one AD becomes unavailable.
- B. Incorrect.
Incorrect. If you only have a single subnet in a single AD, there is no redundancy for the load balancer; it can fail if that AD goes offline.
- C. Correct.
Correct. Continuously monitoring the health of backend servers in both ADs allows the load balancer to send traffic solely to healthy endpoints, ensuring high availability.
- D. Incorrect.
Incorrect. While running multiple load balancers in different ADs is an option, manual switching is error-prone. OCI is designed to operate a single high-availability load balancer across multiple ADs automatically.