Microsoft Updated SC-300 Exam Questions and Answers by freja

In SC-300, publishing an on-premises web app to Azure AD users is performed with Azure AD Application Proxy. The exam materials and Microsoft curriculum explain that you deploy an Application Proxy connector on a Windows Server joined to your on-premises network, which brokers requests to internal apps such as an ASP.NET site. The connector is designed for perimeter-friendly deployments: “Application Proxy connectors only make outbound connections to the Application Proxy service” and “no inbound ports need to be opened in the firewall.” Because the connector initiates the session to Azure over TLS, the firewall requirement is simply to permit the connector’s outbound HTTPS to the service endpoints. This aligns with the least-exposure pattern emphasized in Identity Governance: you avoid publishing inbound listener rules and still support Azure AD features like Conditional Access and MFA at the cloud edge. Alternatives in the list do not meet the publishing requirement: the Password Protection DC agent and Password Protection proxy service are for banned-password enforcement, and Web Application Proxy in Windows Server is a different reverse-proxy technology not required when using Azure AD Application Proxy. Therefore, to publish App1 securely to Azure AD users, install Azure AD Application Proxy on Server4 and allow outbound HTTPS from Server4 through Firewall1.

The Conditional Access What If tool is designed to simulate sign-ins under various conditions to test Conditional Access policies without performing real sign-ins. Microsoft’s SC-300 guide specifies that this tool is essential for validating the effect of a policy based on user, location, device, or risk level.

In this case, the administrator wants to test a policy that blocks access when a high-severity sign-in alert (sign-in risk) occurs and when a user signs in from another country. These scenarios are based on risk and location conditions—both supported in the What If tool simulation.

Microsoft Learn: “Use the What If tool to simulate sign-ins and verify whether a specific Conditional Access policy will be applied.”

SC-300 materials explain that managed identities for Azure resources provide an automatically managed identity in Microsoft Entra ID that apps can use to request tokens, thereby “eliminat[ing] the need to manage credentials” and avoiding secrets in code. They also state that Azure Key Vault is the recommended store for secrets and that apps should access Key Vault by presenting an Entra token from a managed identity rather than an embedded key. For scenarios with multiple virtual machines running the same workload, the guidance highlights user-assigned managed identities: they are created as standalone identities and “can be assigned to one or more instances,” which means you grant Key Vault access once to the shared identity and attach it to all VMs. This minimizes administration compared to system-assigned identities (which are tied 1:1 to each VM lifecycle). With this approach, the VMs obtain Entra tokens via the user-assigned managed identity to call Azure resources and to authenticate to Key Vault; the application then retrieves the third-party API secret from Key Vault at runtime. This meets all requirements: secrets are securely stored, no credentials in code, VMs use Entra authentication, and operational effort is reduced by reusing a single identity across the VM fleet.