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Public endpoints in Azure provide access to cloud resources over the public internet, which is vital when external users or systems need to connect. For example, Azure IoT Hub uses public endpoints to let remote devices, like smart vending machines or connected cars, send data to the cloud. These devices connect securely using device connection strings that contain both the endpoint address and necessary credentials.
Services like Azure Front Door act as global entry points, using public endpoints to receive internet traffic and route it to backend services. To protect these open endpoints from malicious attacks, organizations configure security measures such as Web Application Firewall (WAF) policies. These policies, along with routing and caching rules, help optimize performance while maintaining internet-facing security.
Ultimately, public endpoints are the primary choice when broad accessibility is the main requirement. They are commonly used for hosting public websites, delivering APIs to external developers, and collecting data from global IoT devices. These endpoints allow organizations to leverage Azure's global network infrastructure to reach a worldwide audience easily.
Configuring endpoints requires aligning network settings with your security goals. A public endpoint relies on a public IP address and properly configured Domain Name System (DNS) settings so users across the globe can resolve the address. Security for public endpoints is maintained externally by applying access controls through Network Security Groups (NSGs) and Azure Firewall.
A system architecture diagram contrasting public endpoints, which route internet traffic through DNS, WAF, and firewalls to reach Azure services, with private endpoints, which map Azure PaaS services to private IPs inside a virtual network using Private Link and private DNS zones.
In contrast, configuring a private endpoint integrates the target resource directly into an Azure Virtual Network (VNet). This setup assigns the resource a private IP address within the VNet, requiring local DNS updates to resolve the name internally. Access is strictly controlled within the network using Azure's role-based access control (RBAC) and NSGs to ensure only authorized users and services can communicate with the endpoint.
Regardless of the endpoint type, continuous monitoring is essential for maintaining performance and security. Administrators can use Azure Monitor to track traffic patterns, review access logs, and detect suspicious activity. For public endpoints, this means keeping security policies updated, while for private endpoints, it involves regularly auditing internal access controls.
Private endpoints allow you to connect securely to Azure services over a private network boundary instead of the public internet. By assigning a private IP address from your local virtual network to a service like Azure Storage or Azure SQL Database, the service essentially behaves as if it is inside your network. This setup ensures that traffic never travels over the public internet, significantly reducing exposure to external threats.
Utilizing private endpoints offers major benefits for security, compliance, and architectural simplicity. Many industries with strict regulatory requirements, such as healthcare and finance, use private endpoints to keep data isolated within a private network. This model also simplifies your network architecture by reducing the need to maintain complex internet-facing firewall rules or virtual private networks (VPNs).
Establishing a private endpoint follows a specific order of operations: first, create the private endpoint inside your VNet, next, link it to the desired Azure service, and finally, update your DNS settings. This configuration enforces a zero-trust architecture because traffic stays entirely on the Microsoft backbone network. As a result, the risk of data interception is minimized, keeping your sensitive environments highly secure.
Choosing between endpoint types involves a tradeoff between ease of access and the size of your attack surface. Public endpoints simplify setup but increase vulnerability because the services are discoverable on the internet. Private endpoints, enabled via Azure Private Link, secure connections by mapping specific PaaS resources to private IPs, preventing unauthorized data exfiltration to other resources on the same service.
To safeguard your network infrastructure, implement the following best practices:
To maintain a strong security posture, integrate Azure Monitor with your endpoints to gain visibility into connection patterns. You can stream event logs to Azure Event Hubs, archive them in storage accounts, or analyze them directly to detect anomalies like unusual data volumes. Monitoring metrics, such as the amount of data processed by a private endpoint, helps administrators spot and respond to security incidents quickly.
Public endpoints are designed for scenarios where external accessibility is the top priority. They are the ideal choice for hosting public web applications that need to be visited by users worldwide. They are also highly effective for publishing external APIs and connecting distributed IoT devices that operate in unpredictable physical locations.
Conversely, private endpoints are best suited for scenarios where security, compliance, and performance are critical. This makes them the standard choice for protecting databases holding sensitive customer information and hosting internal corporate applications. Additionally, they are essential for hybrid cloud solutions, allowing on-premises networks to connect securely to Azure resources over private connections.
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Prepare and test your skills
A public endpoint in Azure provides access to cloud resources over the public internet using a public IP address. You should use a public endpoint when external users or systems need to connect to your resources, such as hosting public websites, delivering APIs to external developers, or collecting data from distributed IoT devices.
A private endpoint in Azure allows secure connection to Azure services over a private network boundary by assigning a private IP address from your virtual network to the service. The main benefits include enhanced security by keeping traffic off the public internet, meeting strict regulatory compliance requirements, and simplifying network architecture by reducing the need for complex internet-facing firewall rules.
To configure a private endpoint, you first create it inside your virtual network, then link it to the desired Azure service such as Storage or SQL Database, and finally update your local DNS settings so the name resolves internally. This setup ensures traffic stays on the Microsoft backbone network and follows a zero-trust architecture.
You can protect public endpoints by configuring Web Application Firewall (WAF) policies to filter malicious traffic, using Network Security Groups (NSGs) to control inbound and outbound traffic, deploying Azure Firewall for centralized security policies, and enabling Azure DDoS Protection to guard against volumetric internet attacks. Azure Monitor should also be used to track traffic patterns and detect suspicious activity.
An enterprise organization manages backend database workloads on Azure PaaS services, including Azure SQL Database and Azure Storage. According to corporate compliance and security requirements, virtual machines inside an Azure Virtual Network (VNet) must connect to these services privately without exposing network traffic to the public internet.
Which networking feature should the organization deploy to assign a private IP address within their virtual network to these services?
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