📖 What is Infrastructure as a Service (IaaS)?
Infrastructure as a Service (IaaS) is a cloud computing model that provides virtualized computing resources, such as servers, storage, and networking, over the internet. Customers have the most control in this model, as they are responsible for managing the operating system, apps, and data.
"Student, think of this as a 'virtual data center.' You get the raw virtual machine, but you are still responsible for installing and patching the OS."
📚 Certification: CompTIA A+ Certification Exam Core 2 (220-1102)
🔑 What are the Key Concepts of Infrastructure as a Service (IaaS)?
- ▸ The Shared Responsibility Model defines that the provider manages physical hardware and virtualization, while the user manages the OS, applications, and data.
- ▸ Resource Scalability allows users to dynamically adjust CPU, RAM, and storage based on current demand, providing elasticity without purchasing new hardware.
- ▸ IaaS utilizes a virtualization layer or hypervisor to partition physical server resources into multiple independent virtual machines for different cloud tenants.
- ▸ Administrative Control is highest in IaaS, granting users full root or administrator access to the guest OS to install custom software and configurations.
🎯 How does Infrastructure as a Service (IaaS) appear on the 220-1102 Exam?
You may be asked to identify the cloud model for a company that wants to migrate legacy server images to the cloud while maintaining full control over the operating system and software patches.
A scenario might describe a business needing to quickly deploy multiple virtual servers with custom configurations and specific network settings without the capital expenditure of purchasing and maintaining physical hardware.
Expect questions comparing IaaS, PaaS, and SaaS, where you must select IaaS when the requirement specifically emphasizes the need for the customer to manage the operating system, middleware, and the entire software stack.
❓ Frequently Asked Questions
How does IaaS differ from PaaS in terms of management?
In IaaS, you are responsible for the operating system, including updates and security patches. In PaaS, the provider manages the OS and runtime, allowing you to focus solely on deploying your application code.
Does the cloud provider handle all security updates in an IaaS model?
No. The provider secures the physical infrastructure and the hypervisor. However, you are responsible for patching the guest OS, configuring firewalls, and securing the applications you install on the virtual machine.