1. What is Oracle Cloud Infrastructure (OCI), and why is it used?

Answer: OCI is Oracle’s cloud computing platform that offers a comprehensive set of infrastructure and services. It provides scalable, secure, and cost-effective cloud solutions for businesses, including compute, storage, networking, and database services.

2. Explain the concept of a region and availability domains in OCI.

Answer: A region in OCI is a geographically isolated data center. Each region consists of multiple availability domains (ADs), which are physically separate and isolated data centers with their own power and networking. ADs within a region are interconnected by a low-latency, high-bandwidth network.

3. How can you ensure high availability for applications in OCI?

Answer: High availability in OCI can be achieved by deploying resources across multiple availability domains within the same region. This provides redundancy and fault tolerance. Additionally, load balancers and backup strategies can enhance availability.

4. What is a Virtual Cloud Network (VCN) in OCI, and how does it work?

Answer: A VCN is a logically isolated network within OCI that you can customize to fit your needs. It allows you to define IP address ranges, subnets, route tables, and security lists. VCNs enable you to connect and isolate resources while controlling traffic flow.

5. How is identity and access management (IAM) implemented in OCI?

Answer: IAM in OCI allows you to create and manage users, groups, and policies to control access to resources. Policies are JSON documents that specify permissions for users, groups, or compartments. IAM enables secure resource access and management.

6. What are IAM policies, and how are they structured?

Answer: IAM policies are JSON documents that define what actions are allowed or denied on specific resources. They consist of statements with an “effect” (allow or deny), “action” (list of permitted actions), “resource” (the target resource), and “condition” (optional criteria for access).

7. Explain the purpose of compartments in OCI.

Answer: Compartments are logical containers that help organize and isolate resources. They are used to control access to resources and apply policies at a granular level. Compartments provide a structure for managing resources within a tenancy.

8. What is the role of an OCI image, and how is it used to create instances?

Answer: An OCI image is a template for creating virtual machines (instances). It includes the operating system, software, and configuration settings. To create an instance, you choose an image and specify additional parameters like shape (CPU, memory), networking, and storage.

9. How does OCI handle data security, including encryption at rest and in transit?

Answer: OCI provides encryption mechanisms for data security. Data at rest is encrypted using encryption keys managed by OCI. Data in transit is secured through SSL/TLS encryption. Oracle Cloud offers robust security features to protect data.

10. What is the role of a load balancer in OCI, and why would you use it?

Answer: A load balancer distributes incoming traffic across multiple instances to ensure high availability and scalability of applications. Load balancers improve application performance and provide fault tolerance by directing traffic to healthy instances