Azure Developer Associate (D306)

Correct Answer

B. Create Products that include the desired APIs and set usage limits for each Product.

Explanation

Azure API Management allows the creation of Products, which bundle together one or more APIs. By configuring Products, the company can manage access, apply usage limits, and set different policies for different partners. This feature enables the exposure of multiple APIs while ensuring control over their usage and enforcing restrictions such as rate limiting or quota management. Products provide a structured way to offer APIs to different consumer groups with varied access controls.

Why other options are wrong

A. Implement Policies to restrict access based on IP addresses.

While policies can be implemented in Azure API Management to control access based on IP addresses, it does not address the full need of managing multiple APIs with usage limits for partners. Policies are useful for fine-tuning access controls, but Products offer a more comprehensive solution for managing and organizing APIs for partner access.

C. Use Groups to categorize APIs without any access restrictions.

Groups in Azure API Management are used to organize users, not to manage access to APIs. Categorizing APIs without any access restrictions does not provide the control required to manage access and usage effectively.

D. Deploy Azure Functions to handle API requests dynamically.

Azure Functions can handle dynamic API requests but are not specifically designed for managing and exposing multiple APIs with controlled access and usage. API Management is the more appropriate tool for this scenario as it provides a complete solution for API access control and management.

Correct Answer

A. Archive to cool

Explanation

When copying a blob from the Archive tier to the Cool tier, rehydration is required. This process involves restoring the blob from the low-latency, cold storage (Archive tier) to a more accessible tier (Cool). Rehydration typically takes longer than copying between other tiers, as the Archive tier is optimized for infrequent access and slower retrieval times.

Why other options are wrong

B. Cool to hot

There is no rehydration required when moving a blob from the Cool tier to the Hot tier. The Hot tier is designed for frequent access, and copying between these two tiers is relatively fast and does not require any rehydration.

C. Hot to cool

Similarly, moving a blob from the Hot tier to the Cool tier does not require rehydration. This operation is simply moving the blob to a lower-cost, less-accessible tier.

D. Hot to archive

While moving a blob from the Hot tier to the Archive tier involves a significant reduction in access frequency, it does not require rehydration. Rehydration only applies when restoring a blob from Archive to a more accessible tier.

Correct Answer

B. The copy operation will fail due to lack of permissions on the destination account.

Explanation

To perform a blob copy from one storage account to another, permissions are required on both the source and destination accounts. A SAS (Shared Access Signature) token provides delegated access, and having one only for the source account allows you to read the source blob. However, if the destination account also has public access disabled and no SAS or identity-based permissions are granted for write access to it, the operation will fail due to insufficient permissions on the destination.

Why other options are wrong

A. The copy operation will succeed without any issues

This is incorrect because access to the destination account is required. Having a SAS token for the source is not enough.

C. The copy operation will succeed but only copy metadata

This is incorrect. Copying metadata still requires write permissions on the destination account, so the operation will still fail.

D. The copy operation will succeed if the destination account allows anonymous access

Anonymous access is disabled in the scenario provided. Even if it were enabled, it wouldn't be secure or best practice for write operations.

Correct Answer

B. appsettings.json

Explanation

The appsettings.json file is the primary configuration file used in ASP.NET Core Web Applications and Web APIs to store settings such as database connection strings, application-wide variables, and other configuration values. It is typically loaded at the application's startup and is accessible throughout the application's lifecycle.

Why other options are wrong

A. Program.cs

Program.cs is the entry point for the application, where the host is built and configured, but it is not used to store configuration settings like connection strings or application-wide variables.

C. appsettings.Development.json

appsettings.Development.json is an environment-specific configuration file used to override settings from appsettings.json for the development environment. It does not serve as the primary configuration file for general application settings.

D. Startup.cs

Startup.cs is responsible for configuring services and the application's request pipeline. While it may reference configuration settings, it is not used to store them directly. Configuration data is typically loaded from appsettings.json into the application's services.

Correct Answer

C. 10

Explanation

Azure Storage supports the use of stored access policies to help manage shared access signatures (SAS). For each container, table, queue, or file share, you can associate up to 10 stored access policies. These policies allow administrators to centrally manage constraints for one or more SAS tokens, providing better control over SAS expiry times and permissions.

Why other options are wrong

A. 1

While one policy might be sufficient for some use cases, Azure allows up to 10. Limiting it to only 1 would reduce flexibility and control in managing SAS tokens.

B. 5

This value underestimates Azure's capability. Though 5 might be a reasonable number, Azure's actual limit is higher, allowing for more scalability and management options.

D. 100

This exceeds the actual limit. Azure enforces a maximum of 10 stored access policies per entity, so 100 is incorrect and not supported by the service.

Correct Answer

D. @Microsoft.KeyVault(SecretName=MyConnection;Vault=MyVault)

Explanation

To use a key vault reference in Azure, the correct syntax for accessing a secret from Azure Key Vault involves specifying the SecretName and the Vault parameters. The correct format is @Microsoft.KeyVault(SecretName=MyConnection;Vault=MyVault), where SecretName is the name of the secret you want to retrieve (in this case, "MyConnection") and Vault is the name of the Key Vault (in this case, "MyVault").

Why other options are wrong

A. @Microsoft.KeyVault(Secret=MyConnection;VaultName=MyVault)

This is not the correct syntax for referencing a Key Vault secret. The SecretName parameter is the correct one to use instead of Secret.

B. @Microsoft.KeyVault(SecretName=MyConnection;VaultName=MyVault)

While this is close, the correct parameter name for the vault reference is Vault, not VaultName.

C. @Microsoft.KeyVault(Secret=MyConnection;Vault=MyVault)

This syntax incorrectly uses Secret instead of SecretName. The correct syntax requires the use of SecretName to specify the name of the secret.

Correct Answer

B. Authorization server

Explanation

The OAuth framework consists of several components, and when an access token is invalid, the first component to investigate is the Authorization server. The Authorization server is responsible for issuing and validating access tokens. If there is an error with the access token, such as it being invalid, the issue likely lies in the token issuance process or the configuration of the authorization server, which may not have issued the token correctly or may be misconfigured.

Why other options are wrong

A. Resource owner

The resource owner typically refers to the entity (e.g., a user) who owns the data or resources being accessed by the application. While the resource owner is involved in authentication and authorization, issues with an invalid access token are more likely to stem from the authorization server rather than the resource owner.

C. Resource server

The resource server is responsible for serving the protected resources (APIs) and validating the access token. However, if the token is invalid, the issue is more likely related to the issuance process rather than the server that validates the token. Thus, the problem is not typically with the resource server.

D. Third-party client

The third-party client is the application or system that is using OAuth to access the protected resources. While misconfigurations can occur here, an invalid access token is usually indicative of a problem in the authorization flow, particularly during token issuance, so the issue should first be investigated at the authorization server level.

Correct Answer

C. By configuring Smart detection to receive alerts about performance anomalies.

Explanation

Azure Monitor’s Smart detection feature can automatically identify performance anomalies and issues, such as spikes in response time or failures. By configuring Smart detection, the developer can receive proactive alerts when there are performance deviations from the expected behavior, allowing them to take timely actions to address the root causes of performance problems.

Why other options are wrong

A. By implementing Azure Functions to handle requests more efficiently.

While Azure Functions can help scale processing and manage workloads, it does not specifically address performance anomalies like those identified by Smart detection in Azure Monitor.

B. By analyzing the application map to identify bottlenecks.

This approach can help identify bottlenecks, but it is not a direct solution for receiving alerts about performance issues as Smart detection would provide. It requires manual analysis rather than proactive alerting.

D. By deploying additional resources through Azure Resource Manager templates.

Deploying additional resources can scale the system but doesn't directly address performance anomalies. Smart detection focuses on identifying issues rather than resource allocation.

Correct Answer

B. Use Lease Blob to obtain exclusive access

Explanation

To prevent multiple applications from modifying a blob concurrently, Azure provides the Lease Blob feature. A lease on a blob grants exclusive write access to the blob, preventing other applications from making changes while the lease is active. This ensures that only the application that holds the lease can modify the blob, while others are blocked from making changes.

Why other options are wrong

A. Set Blob Immutability Policy

Immutability policies are typically used to prevent data from being modified or deleted for a specific period, but they do not provide exclusive write access. This option would not allow one application to modify the blob while preventing others.

C. Create a Snapshot Blob for each application

Creating a snapshot of the blob creates a read-only version of the blob, but it does not provide exclusive write access. Multiple applications could still interact with the original blob, so this solution does not solve the concurrency issue.

D. Adjust Accessibility Settings to allow concurrent writes

Allowing concurrent writes would create the potential for conflicts and data corruption. This option does not align with the goal of ensuring that only one application can modify the blob at a time.

E. Set Blob Properties to restrict access

Setting blob properties might help control access, but it does not offer a mechanism for preventing concurrent writes in the way that leasing does. It’s not designed for managing write access concurrency.