Cloud & Virtualization Week Part 2: SaaS, PaaS, and IaaS – The “Pizza” Model

In the Network+ world, we categorize cloud services into three main models. Today, We are going to use the famous “Pizza as a Service” analogy to understand who is responsible for what.

1. Infrastructure as a Service (IaaS)

The “Take and Bake” Pizza.

They provide the oven, the gas, and the kitchen. You are providing the dough, the toppings, and you do the cooking.

• In IT: The provider (AWS/Azure) gives you the Virtual Machine, Storage, and Networking.
• Your Job: You install the Operating System (Windows/Linux), you manage the security patches, and you install the apps.
• Use Case: When your job needs a custom database server that you want total control over.

2. Platform as a Service (PaaS)

The “Pizza Delivery” Service.

You don’t need a kitchen or an oven. You just provide the table and the hungry people. The pizza arrives ready to eat, but you don’t control how it was made.

• In IT: The provider gives you a Platform to run your code. You don’t see the OS, the hard drives, or the updates.
• Your Job: You just upload your code or your data.
• Use Case: A developer at your job is writing a custom app, They don’t care about “Windows Updates”; they just want their code to run

3. Software as a Service (SaaS)

The “Dining Out” Experience.

You walk into the restaurant, sit down, and eat. You don’t care about the kitchen, the chef, or the grocery list. You just use the service

• In IT: Everything is managed by the provider. You just log in through a web browser.
• Your Job: Just manage your own data and users
• Use Cases: Google Workspace, Microsoft 365, or Zoom. This is 90% of what schools typically interact with every day.

4. Public vs. Private vs. Hybrid Cloud

Where does this “Pizza” live?

• Public Cloud: Services offered over the public internet (AWS, Azure, Google Cloud). You share the physical hardware with other companies (though your data is isolated).
• Private Cloud: Cloud resources used exclusively by your organization. It might even live on-premise in your own data center.
• Hybrid Cloud: The best of both worlds. Your job might keep sensitive employee records on a Private server but use the Public cloud for email and web hosting.

5. The “Support Associate” Reality: Cloud Latency

At work, if someone says “The Cloud is slow,” They usually mean the Network is slow.

• Because SaaS apps like Google Docs live in a data center hundreds of miles away, your local bandwidth and “ping” (Latency) matter more than ever.
• If your job’s fiber line is saturated, the “cloud” stops working. This is why we spent last week talking about Load Balancers and Traffic Shaping!

🧪 The “Exam Tip” for Network+

From my studies I’ve learned that CompTIA loves the term “Shared Responsibility Model.” In the cloud, security is a team sport

• The provider is responsible for the Security OF the Cloud (The physical data center, the power, the hardware).
• You are responsible for the Security IN the Cloud (Your passwords, your permissions, and your data).

What’s Next?

We’ve moved the servers to the cloud. Tomorrow we talk about the “Edge” we’re diving into IoT (Internet of Things) and Industrial Control Systems. We’ll talk about smart thermostats, security cameras, and why having a “Smart Fridge” on your jobs network is a massive security headache!