Chapter 1
IT Concepts and Terminology
Course: Comptia Tech Fc0 U71
Subject: Comptia Tech Fc0U71
Chapter: Infrastructure
1. Virtualization
Virtualization is the process of creating software-based (virtual) versions of computing resources, including servers, operating systems, networks, and storage. It abstracts hardware from the software running on it, allowing multiple virtual instances to run on a single physical machine.
Virtualization plays a critical role in:
- Resource optimization
- Data center consolidation
- Dev/test environments
- Disaster recovery solutions
- Cloud infrastructure
a. Hypervisor
Definition:
A hypervisor, also known as a Virtual Machine Monitor (VMM), is the foundational software component that enables hardware-level virtualization. It allows a single physical machine (host) to run multiple independent virtual machines (guests), each with its own OS and applications.
Types of Hypervisors:
- Type 1 – Bare-Metal Hypervisors:
Installed directly on hardware, no underlying host OS.
Offers better performance, efficiency, and scalability.