Читать книгу CompTIA Cloud+ Study Guide - Ben Piper, David Higby Clinton - Страница 111

In this introductory chapter, you explored the big picture of cloud computing. You investigated the many types of service models offered in the marketplace today. The core models include IaaS, which strives to emulate the core components of a traditional data center and offer them as a service to facilitate migrations to the cloud. The PaaS and SaaS models extend the benefits of elasticity and pay-as-you-go pricing without the commitment and expertise required to pull off an IaaS deployment. In these models, the cloud provider handles the compute, storage, and network infrastructure.

Cloud delivery models are important to understand for the exam. You looked at the various types of models, including private, public, community, and hybrid clouds, and what the general use cases and differences are for each type of delivery model.

You also learned about the fundamental characteristics of cloud computing. The cloud offers on-demand, self-service provisioning of elastic resources that you pay for on a metered basis. The chapter discussed resource pooling and virtualization of resources such as storage, CPU, memory, storage, and networking.

The chapter also covered how to prepare to migrate your operations to the cloud and how it's important to test systems in the cloud—including sizing, performance, availability, connectivity, data integrity, and others—and that you document the results.

As you read the rest of the book, keep these fundamental concepts in mind, because they provide a structure that you'll build on as you progress on your journey to become Cloud+ certified.