📖 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. The provider manages the physical hardware, while the customer is responsible for managing the operating system and applications.
"In the Shared Responsibility Model, IaaS gives the customer the most control and the most management responsibility compared to PaaS or SaaS."
📚 Certification: Certified in Cybersecurity (CC)
🔑 What are the Key Concepts of Infrastructure as a Service (IaaS)?
- ▸ Customer Control: Users manage the operating system, middleware, runtime, and applications, providing maximum flexibility for custom configurations and specific software installations.
- ▸ Provider Management: The cloud provider is responsible for the physical infrastructure, including servers, storage, networking hardware, and the virtualization layer (hypervisor).
- ▸ On-Demand Scalability: IaaS allows organizations to rapidly scale computing resources up or down to meet fluctuating demand without purchasing physical hardware.
- ▸ Operational Expenditure: IaaS typically follows a pay-as-you-go pricing model, shifting costs from capital expenditures (CapEx) to operational expenditures (OpEx).
- ▸ Shared Responsibility: In IaaS, the customer bears the highest security burden, including patching the guest OS and configuring network firewalls.
🎯 How does Infrastructure as a Service (IaaS) appear on the CC Exam?
You may be asked to identify the best cloud model for a company that requires full administrative access to the operating system to install legacy software.
A scenario might describe a security incident involving an unpatched guest OS; you must determine that the customer, not the provider, is responsible under IaaS.
Expect questions where you must distinguish IaaS from PaaS based on who manages the runtime environment and the underlying operating system.
❓ Frequently Asked Questions
If the cloud provider manages the hardware, why is IaaS considered the most complex model for the customer?
Because the customer is responsible for everything above the hypervisor, including installing, patching, and securing the operating system and all hosted applications.
How does the Shared Responsibility Model differ between IaaS and SaaS?
In IaaS, the customer manages the OS and apps. In SaaS, the provider manages nearly everything, leaving the customer responsible only for their data and access.