Free Microsoft DP-420 Exam Practice Questions & Explanations

Last updated on: Aug 29, 2026
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Question 1

You are designing an Azure Cosmos DB Core (SQL) API solution to store data from IoT devices. Writes from the devices will be occur every second.

The following is a sample of the data.

You need to select a partition key that meets the following requirements for writes:

Minimizes the partition skew

Avoids capacity limits

Avoids hot partitions

What should you do?

Answer Options
Correct Answer: D
Explanation

Use a partition key with a random suffix. Distribute the workload more evenly is to append a random number at the end of the partition key value. When you distribute items in this way, you can perform parallel write operations across partitions.

Incorrect Answers:

A: You will also not like to partition the data on ''DateTime'', because this will create a hot partition. Imagine you have partitioned the data on time, then for a given minute, all the calls will hit one partition. If you need to retrieve the data for a customer, then it will be a fan-out query because data may be distributed on all the partitions.

B: Senser1Value has only two values.

C: All the devices could have the same manufacturer.

Question 2

You have an Azure subscription.

You plan to implement an Azure Cosmos DB for NoSQL single-region write account named account1 that will replicate across two Azure regions.

You need to set the default consistency level for account1. The solution must meet the following requirements:

* Writes must be performed to a local majority in a single region.

* Reads must be performed from a local minority in a single region.

Which consistency level should you select?

Answer Options
Correct Answer: D
Question 3

You plan to implement an Azure Cosmos DB container that will store telemetry data from 1,000 loT devices. The data will be updated once every minute. An app will read the data once daily and generate aggregated reports that summarize the state of each device.

You need to configure a partition key for the container. The solution must meet the following requirements:

* Minimize the possibility of reaching the partition limits.

* Spread read and write operations evenly across the partitions.

* Minimize how long it takes to locate a specific set of telemetry values.

To what should you set the partition key?

Answer Options
Correct Answer: C
Question 4

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.

After you answer a question in this section, you will NOT be able to return to it. As a result1 these questions will not appear in the review screen.

You have a database in an Azure Cosmos DB for NoSQL account that is configured for multi-region writes.

You need to use the Azure Cosmos OB SDK to implement the conflict resolution policy for a container. The solution must ensure that any conflicts are sent to the conflicts feed.

Solution: You set ConflictResolutionMode to Laswriterwins and you use the default settings for the policy.

Does this meet the goal?

Answer Options
Correct Answer: A
Question 5

You have a database named db1 in an Azure Cosmos DB f You have a third-party application that is exposed thro You need to migrate data from the application to a What should you use?

Answer Options
Correct Answer: B
Explanation

you can migrate data from various data sources to Azure Cosmos DB using different tools and methods.The choice of the migration tool depends on factors such as the data source, the Azure Cosmos DB API, the size of data, and the expected migration duration1. Some of the common migration tools are:

Azure Cosmos DB Data Migration tool: This is an open source tool that can import data to Azure Cosmos DB from sources such as JSON files, MongoDB, SQL Server, CSV files, and Azure Cosmos DB collections.This tool supports the SQL API and the Table API of Azure Cosmos DB2.

Azure Data Factory: This is a cloud-based data integration service that can copy data from various sources to Azure Cosmos DB using connectors.This tool supports the SQL API, MongoDB API, Cassandra API, Gremlin API, and Table API of Azure Cosmos DB3.

Azure Cosmos DB live data migrator: This is a command-line tool that can migrate data from one Azure Cosmos DB container to another container within the same or different account.This tool supports live migration with minimal downtime and works with any Azure Cosmos DB API4.

For your scenario, if you want to migrate data from a third-party application that is exposed through an OData endpoint to a container in Azure Cosmos DB for NoSQL, you should useAzure Data Factory.Azure Data Factory has an OData connector that can read data from an OData source and write it to an Azure Cosmos DB sink using the SQL API5. You can create a copy activity in Azure Data Factory that specifies the OData source and the Azure Cosmos DB sink, and run it on demand or on a schedule.