AZ-104 Series: This is Part 1 of 67 in the complete Azure Administrator (AZ-104) study guide.

Welcome to the first post in our 67-part series on preparing for the AZ-104 Azure Administrator exam. In this post, we’ll be covering the fundamentals of Azure cloud computing, including the core concepts of IaaS, PaaS, SaaS, and public, private, and hybrid clouds. Understanding these concepts is crucial for any Azure administrator, as they form the foundation of Azure cloud services.

As an Azure administrator, you’ll be working with a variety of cloud services and technologies, and it’s essential to have a solid grasp of the underlying concepts. In this post, we’ll take a beginner-friendly approach, using clear explanations, analogies, and step-by-step examples to help you understand these complex topics.

Core Concepts

IaaS (Infrastructure as a Service)

IaaS is a cloud computing model where a third-party provider delivers virtualized computing resources, such as servers, storage, and networking, over the internet. With IaaS, you have complete control over the infrastructure, and you’re responsible for managing and configuring the resources.

Think of IaaS like renting a house. You have control over the interior and can decorate and furnish it as you like, but you’re not responsible for maintaining the exterior or the property itself. In IaaS, you’re responsible for the operating system, applications, and data, while the provider manages the underlying infrastructure.

PaaS (Platform as a Service)

PaaS is a cloud computing model where a third-party provider delivers a complete platform for developing, running, and managing applications, including tools, libraries, and infrastructure. With PaaS, you have control over the application and data, but not the underlying infrastructure.

Think of PaaS like a furnished apartment. You have control over the interior and can decorate and arrange the furniture as you like, but you’re not responsible for maintaining the building or the exterior. In PaaS, you’re responsible for the application and data, while the provider manages the underlying platform and infrastructure.

SaaS (Software as a Service)

SaaS is a cloud computing model where a third-party provider delivers software applications over the internet, eliminating the need for local installation and maintenance. With SaaS, you have control over the data, but not the application or infrastructure.

Think of SaaS like a hotel room. You have access to the room and its amenities, but you’re not responsible for maintaining the room or the hotel itself. In SaaS, you’re responsible for the data, while the provider manages the application and infrastructure.

Public, Private, and Hybrid Clouds

A public cloud is a cloud computing environment that’s open to the general public, such as Azure, AWS, or Google Cloud. A private cloud is a cloud computing environment that’s provisioned and managed within a single organization, such as a company’s internal data center. A hybrid cloud is a combination of public and private clouds, where an organization uses both public and private cloud services.

Think of public, private, and hybrid clouds like different types of transportation. A public cloud is like a bus, where you share the ride with others. A private cloud is like a personal car, where you have complete control over the vehicle. A hybrid cloud is like a combination of a car and a bus, where you use the car for personal trips and the bus for public transportation.

How It Works

Now that we’ve covered the core concepts, let’s take a deeper dive into how IaaS, PaaS, and SaaS work in Azure.

In Azure, IaaS is delivered through virtual machines (VMs), which are hosted on Azure’s infrastructure. You can create and manage VMs using the Azure portal or Azure CLI. For example, you can create a VM using the following Azure CLI command:

az vm create --resource-group myResourceGroup --name myVM --image UbuntuLTS --size Standard_DS2_v2

In Azure, PaaS is delivered through services like Azure App Service, Azure Functions, and Azure Storage. You can create and manage PaaS resources using the Azure portal or Azure CLI. For example, you can create an Azure App Service using the following Azure CLI command:

az webapp create --resource-group myResourceGroup --name myApp --runtime python|3.8

In Azure, SaaS is delivered through services like Azure Active Directory (Azure AD) and Microsoft 365. You can create and manage SaaS resources using the Azure portal or Azure CLI. For example, you can create an Azure AD user using the following Azure CLI command:

az ad user create --display-name myUser --password myPassword --user-principal-name myUser@example.com

Step-by-Step Guide

Now that we’ve covered the concepts and architecture, let’s walk through a step-by-step guide on how to create and manage IaaS, PaaS, and SaaS resources in Azure.

First, let’s create a VM using the Azure portal:

1. Log in to the Azure portal and navigate to the Virtual Machines page.
2. Click on the + New button to create a new VM.
3. Fill in the required details, such as the VM name, resource group, and image.
4. Click on the Create button to create the VM.

Next, let’s create an Azure App Service using the Azure CLI:

1. Open the Azure CLI and log in to your Azure account.
2. Run the following command to create a new resource group:

   az group create --name myResourceGroup --location westus2

3. Run the following command to create a new App Service:

   az webapp create --resource-group myResourceGroup --name myApp --runtime python|3.8

Finally, let’s create an Azure AD user using the Azure portal:

1. Log in to the Azure portal and navigate to the Azure Active Directory page.
2. Click on the + New user button to create a new user.
3. Fill in the required details, such as the user name, password, and user principal name.
4. Click on the Create button to create the user.

Real-World Use Cases

Now that we’ve covered the concepts and step-by-step guide, let’s look at some real-world use cases for IaaS, PaaS, and SaaS in Azure.

Use Case 1: Web Application Hosting

A company wants to host a web application in Azure. They can use IaaS to create a VM and install the web server software, or they can use PaaS to create an Azure App Service and deploy the web application. In this case, the company chooses to use PaaS, as it provides a managed platform for deploying and scaling the web application.

Use Case 2: Data Storage and Analytics

A company wants to store and analyze large amounts of data in Azure. They can use IaaS to create a VM and install the data storage and analytics software, or they can use SaaS to use Azure Storage and Azure Analytics. In this case, the company chooses to use SaaS, as it provides a managed platform for storing and analyzing data, with built-in security and scalability features.

Use Case 3: Identity and Access Management

A company wants to manage user identities and access to Azure resources. They can use IaaS to create a VM and install the identity and access management software, or they can use SaaS to use Azure Active Directory. In this case, the company chooses to use SaaS, as it provides a managed platform for managing user identities and access, with built-in security and scalability features.

Best Practices and Common Mistakes

When working with IaaS, PaaS, and SaaS in Azure, there are some best practices and common mistakes to keep in mind.

Best Practice 1: Use the Right Cloud Model

Choose the right cloud model (IaaS, PaaS, or SaaS) based on your business needs and requirements. For example, if you need complete control over the infrastructure, use IaaS. If you need a managed platform for deploying and scaling applications, use PaaS. If you need a managed platform for storing and analyzing data, use SaaS.

Best Practice 2: Monitor and Optimize Resources

Monitor and optimize your Azure resources regularly to ensure they’re running efficiently and effectively. Use Azure Monitor and Azure Advisor to monitor resource usage and receive recommendations for optimization.

Common Mistake 1: Overprovisioning Resources

Don’t overprovision Azure resources, as this can lead to increased costs and decreased efficiency. Use Azure Advisor to receive recommendations for right-sizing resources.

Common Mistake 2: Not Using Security Features

Don’t neglect to use Azure security features, such as Azure Security Center and Azure Active Directory, to protect your resources and data. Use these features to monitor and respond to security threats.

AZ-104 Exam Tips

When preparing for the AZ-104 Azure Administrator exam, keep the following tips in mind:

• Understand the Core Concepts: Make sure you understand the core concepts of IaaS, PaaS, and SaaS, as well as public, private, and hybrid clouds.
• Know the Azure Services: Familiarize yourself with the various Azure services, including Azure Compute, Azure Storage, Azure Networking, and Azure Security.
• Practice with Azure CLI and Portal: Practice using the Azure CLI and Azure portal to create and manage Azure resources.
• Focus on Security and Compliance: Focus on security and compliance topics, such as Azure Security Center, Azure Active Directory, and data encryption.

Some common exam questions on this topic include:

• What is the difference between IaaS, PaaS, and SaaS?
• How do you create a VM in Azure using the Azure CLI?
• What is the purpose of Azure Active Directory?
• How do you configure security features in Azure?

Summary and Next Steps

In this post, we covered the fundamentals of Azure cloud computing, including IaaS, PaaS, SaaS, and public, private, and hybrid clouds. We also walked through a step-by-step guide on how to create and manage Azure resources using the Azure portal and Azure CLI.

In the next post, we’ll dive deeper into Azure Compute services, including virtual machines, virtual machine scale sets, and container instances. We’ll also cover Azure Storage services, including blob storage, file storage, and disk storage.

Thanks for reading, and we’ll see you in the next post!

Please refer our this blog to understand in depth – Azure Cloud Computing Simplified