What is the effect of setting a preferred region in the Azure Cosmos DB SDK?

It influences which region is used for read operations to reduce latency.

It disables failover to other regions.

It ensures that all write operations are sent to that region only.

It changes the account's replication configuration to add a new region.

A global e-commerce platform uses Azure Cosmos DB with multiple write regions. The application is deployed in two regions: East US and West Europe. The team wants to ensure that writes from the West Europe deployment are served by the West Europe region to reduce latency, while reads can fall back to East US if West Europe is unavailable. The application uses the .NET SDK and a singleton client. What should they configure?

Set ApplicationRegion to 'West Europe' and PreferredLocations to ['West Europe', 'East US'].

Set ApplicationRegion to 'East US' and PreferredLocations to ['East US', 'West Europe'].

Set PreferredLocations to ['West Europe', 'East US'] and leave ApplicationRegion unset.

Use a separate CosmosClient for each region with different ApplicationRegion settings.

A microservices application has multiple services that each need to read from the same Cosmos DB container. Each service currently creates its own CosmosClient instance on startup. The team notices high CPU usage and socket exhaustion. What should they do to reduce resource usage?

Use a static CosmosClient instance shared across all services.

Create a single CosmosClient instance per service and reuse it for all operations.

Create a new CosmosClient instance for each request.

Increase the connection pool size on each client.

A support engineer is troubleshooting intermittent connectivity issues in a .NET application that uses the Cosmos DB SDK. They need to capture detailed request-level logs, including the request ID and status codes, without affecting application performance. What should they do?

Increase the 'MaxRetryAttemptsOnThrottledRequests' to 10.

Set the 'ConnectionMode' to 'Gateway' to enable logging.

Enable SDK logging by setting the 'CosmosClientOptions.Diagnostics' property to include request diagnostics.

Use a network packet capture tool like Wireshark.

Microsoft Certified:Azure Cosmos DB Developer Specialty

Domain 1Objective 4

Implement Client Connectivity Options in the Azure Cosmos DB SDK DP-420 Practice Questions (Page 5)

Part of the Design and implement data models domain, which makes up ~45% of our current practice bank. Microsoft does not publish an official question count, but from its 100-minute exam (~40–65 total, ~18–29 in this domain), expect 3–4 from this objective — we provide 32 practice questions to prepare you well beyond it. (estimate)

32questions here

7free pages

9concepts

Questions 21–25

21foundation · easy
In the Azure Cosmos DB Python SDK, which class is used to establish a connection to a Cosmos DB account?
Select an answer first
22foundation · easy
What is the effect of setting a preferred region in the Azure Cosmos DB SDK?
Select an answer first
23expert · hard
A global e-commerce platform uses Azure Cosmos DB with multiple write regions. The application is deployed in two regions: East US and West Europe. The team wants to ensure that writes from the West Europe deployment are served by the West Europe region to reduce latency, while reads can fall back to East US if West Europe is unavailable. The application uses the .NET SDK and a singleton client. What should they configure?
Select an answer first
24application · medium
A microservices application has multiple services that each need to read from the same Cosmos DB container. Each service currently creates its own CosmosClient instance on startup. The team notices high CPU usage and socket exhaustion. What should they do to reduce resource usage?
Select an answer first
25application · medium
A support engineer is troubleshooting intermittent connectivity issues in a .NET application that uses the Cosmos DB SDK. They need to capture detailed request-level logs, including the request ID and status codes, without affecting application performance. What should they do?
Select an answer first

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Implement Client Connectivity Options in the Azure Cosmos DB SDK DP-420 Practice Questions (Page 5)

Questions 21–25

In the Azure Cosmos DB Python SDK, which class is used to establish a connection to a Cosmos DB account?

What is the effect of setting a preferred region in the Azure Cosmos DB SDK?

A microservices application has multiple services that each need to read from the same Cosmos DB container. Each service currently creates its own CosmosClient instance on startup. The team notices high CPU usage and socket exhaustion. What should they do to reduce resource usage?

A support engineer is troubleshooting intermittent connectivity issues in a .NET application that uses the Cosmos DB SDK. They need to capture detailed request-level logs, including the request ID and status codes, without affecting application performance. What should they do?

Keep studying — Design and implement data models