Azure Security Services Explained with Practical Examples

A secure Azure application needs several kinds of protection. You need to control who can access it, keep secrets safe, inspect network traffic, withstand large traffic attacks, and spot security risks. These five services address those needs.

1. Microsoft Defender for Cloud

What it means: Microsoft Defender for Cloud helps you find security weaknesses in cloud resources and, with the relevant protection plans enabled, detect threats against workloads. Think of it as a security dashboard that shows what needs attention and helps your team prioritize fixes.

Practical example: Your team runs an application on AKS. Defender for Cloud highlights a security recommendation affecting the cluster. You review the affected resource, assess the risk, make the required change, and check that the recommendation is resolved.

Remember: It helps you discover and respond to risks; it does not replace access controls or a firewall.

This example shows how your team handles a security recommendation affecting an AKS cluster.

Practical example: Defender for Cloud identifies an insecure configuration in your AKS environment. Your team reviews the recommendation, applies the fix, and checks the updated assessment.

Caption: Defender for Cloud helps teams identify weaknesses, prioritize changes, and verify improvements. Threat detection additionally depends on the relevant workload protection plans.

2. Azure Key Vault

What it means: Azure Key Vault stores and controls access to secrets, encryption keys, and certificates. Applications and authorized users can retrieve what they need without placing sensitive values in source code.

Practical example: A payment application needs a database password. Instead of writing the password in its deployment files, your team stores it in Key Vault. The application uses an approved identity to retrieve the secret at runtime. Key Vault uses Microsoft Entra ID to authenticate that identity.

Remember: Key Vault protects sensitive values; your team must still grant access only to the identities that need them.

Place this after your Azure Key Vault practical example. It connects Key Vault and Entra ID while explaining authentication and authorization.

Caption: The application proves its identity through Microsoft Entra ID. Key Vault validates the request and checks permissions before returning the secret.

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3. Microsoft Entra ID

What it means: Microsoft Entra ID, formerly Azure Active Directory, is Microsoft’s cloud identity and access management service. It helps establish who a user or application is and supports control over what they can access.

Practical example: A DevOps engineer signs in to manage Azure resources. Their identity is verified through Entra ID, while their assigned permissions determine which resources they can manage. An application can also use an identity to access services such as Key Vault.

Remember: Authentication answers “Who are you?” Authorization answers “What are you allowed to do?”

This example shows an engineer signing in to manage Azure resources. Entra ID authenticates the engineer; Azure RBAC determines their resource permissions.

Practical example: An engineer with the Reader role can view resources but cannot modify them. Successfully signing in does not automatically grant permission to deploy or delete resources.

Caption: Authentication verifies who you are. Authorization determines which actions you can perform.

4. Azure Firewall

What it means: Azure Firewall is a managed network security service for controlling and inspecting traffic to and from Azure workloads. Your team defines rules for the traffic it should allow or block.

Practical example: Your AKS workloads need to reach an approved external API. Your team routes the relevant network traffic through Azure Firewall and creates rules that permit the required destination while restricting unwanted connections.

Remember: Azure Firewall controls network traffic. Application Gateway or Front Door with a web application firewall (WAF) can address web request threats at the application layer.

This example shows AKS outbound traffic routed through Azure Firewall.

Practical example: A payment application needs an approved partner API over HTTPS. Your team configures an application rule allowing its destination FQDN. Unmatched outbound connections are denied.

Caption: Azure Firewall evaluates traffic routed through it and allows or blocks connections according to the configured policy.

Configuration point: Deploying Azure Firewall alone does not make it inspect every connection—configure the network routes so the intended traffic passes through it.

5. Azure DDoS Protection

What it means: Azure DDoS Protection helps defend publicly reachable Azure resources against large distributed denial of service attacks. These attacks attempt to overwhelm a service with traffic so legitimate users cannot reach it. Azure DDoS Protection focuses on network layer attacks; a WAF adds protection for application layer web attacks.

Practical example: A banking application has a public endpoint. If attackers flood its public IP with network traffic, Azure DDoS Protection helps mitigate the attack so the service can continue handling legitimate traffic.

Remember: DDoS Protection helps with traffic floods. It does not decide who may sign in or store application passwords.

Place this under “How they work together.” It shows a banking application on AKS, with each service protecting a different area.

Caption: Layered security for an Azure banking application: protect the public endpoint, control outbound connections, verify application identities, secure secrets, and assess workload risks.

DDoS Protection protects the eligible public IP against network layer attacks, while WAF inspects web requests. Azure Firewall handles the outbound traffic routed through it in this example.

How they work together

Imagine a customer-facing application running on AKS:

Security need	Azure service	Example
Identify users and applications	Microsoft Entra ID	Verify an engineer signing in and an application requesting access
Protect passwords and certificates	Azure Key Vault	Store the application’s database password
Control network connections	Azure Firewall	Allow approved destinations and restrict unwanted traffic
Handle network traffic floods	Azure DDoS Protection	Mitigate an attack against a public IP
Find weaknesses and detect threats	Microsoft Defender for Cloud	Review security recommendations and workload alerts

Simple takeaway: Entra ID manages identities, Key Vault protects sensitive values, Azure Firewall controls network traffic, DDoS Protection helps keep public services reachable during attacks, and Defender for Cloud helps your team see and address security risks.