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  • DP-420: Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB

Microsoft DP-420 Exam Questions

Exam Name: Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB
Exam Code: DP-420
Related Certification(s): Microsoft Azure Cosmos DB Developer Specialty Certification
Certification Provider: Microsoft
Actual Exam Duration: 100 Minutes
Number of DP-420 practice questions in our database: 144 (updated: Jun. 11, 2025)
Expected DP-420 Exam Topics, as suggested by Microsoft :
  • Topic 1: Design and Implement Data Models: This topic equips Microsoft developers to design and implement non-relational data models for Azure Cosmos DB for NoSQL, emphasizing partitioning strategies, database sizing, and scaling. Developers master connectivity using the Azure Cosmos DB SDK and SQL language for NoSQL, ensuring seamless data access. Additionally, server-side programming with JavaScript empowers robust solutions tailored to specific application needs.
  • Topic 2: Design and Implement Data Distribution: Microsoft developers delve into designing replication strategies and implementing multi-region writes for Azure Cosmos DB. These skills ensure high availability, fault tolerance, and enhanced global performance for distributed applications, making them vital for enterprise-grade solutions.
  • Topic 3: Integrate an Azure Cosmos DB Solution: This topic focuses on enabling analytical workloads and integrating Azure Cosmos DB across services. Developers learn to leverage cross-service integrations for cohesive solutions, driving advanced analytics and operational efficiency in cloud-native applications.
  • Topic 4: Optimize an Azure Cosmos DB Solution: Developers gain expertise in optimizing query performance using Azure Cosmos DB for NoSQL APIs, implementing change feeds, and crafting effective indexing strategies. This topic ensures solutions are performant, scalable, and adaptive to evolving data requirements, enhancing application responsiveness.
  • Topic 5: Maintain an Azure Cosmos DB Solution: This section covers monitoring, troubleshooting, and securing Azure Cosmos DB solutions. Developers master backup and restore procedures, implement data movement, and streamline processes using DevOps. These skills ensure operational reliability and safeguard data integrity in production environments.
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Lili

8 days ago
Nailed the Microsoft Cosmos DB exam! Pass4Success's relevant questions were a huge time-saver.
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Alecia

2 months ago
Azure Cosmos DB certified! Pass4Success's concise materials helped me prepare quickly and effectively.
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Tiffiny

3 months ago
Passed the Cosmos DB exam on my first try! Pass4Success's focused content made all the difference.
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Ressie

4 months ago
Thank you Pass4Success! Your practice questions were key to my Azure Cosmos DB exam success.
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Ivory

5 months ago
Thrilled to share that I passed the Microsoft Azure Cosmos DB exam! Pass4Success practice questions were essential. There was a difficult question on designing and implementing data distribution, particularly about handling data consistency across multiple regions. I wasn't confident, but I passed!
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Erick

5 months ago
Microsoft Cosmos DB cert acquired! Couldn't have done it without Pass4Success's efficient study materials.
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Rosalind

6 months ago
I passed the Azure Cosmos DB exam, and Pass4Success practice questions were a great help. One tricky question was about designing and implementing data models, specifically how to model relationships between entities. Even though I was unsure, I passed!
upvoted 0 times
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Shawnta

6 months ago
Pass4Success rocks! Their prep materials helped me clear the Azure Cosmos DB exam in no time.
upvoted 0 times
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Cheryl

6 months ago
I successfully passed the Microsoft Azure Cosmos DB exam, thanks to Pass4Success. One question that puzzled me was about integrating an Azure Cosmos DB solution with Azure Logic Apps. I wasn't entirely sure how to set up the integration, but I managed to pass!
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Laticia

7 months ago
Happy to announce that I passed the Azure Cosmos DB exam! Pass4Success practice questions were crucial. There was a challenging question on maintaining an Azure Cosmos DB solution, specifically about configuring multi-region writes. I wasn't sure of the best approach, but I still passed!
upvoted 0 times
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Wendell

7 months ago
Are there questions on optimizing query performance?
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Noemi

7 months ago
Aced the Microsoft Cosmos DB exam! Pass4Success really came through with relevant practice questions.
upvoted 0 times
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Catarina

7 months ago
I passed the Microsoft Azure Cosmos DB exam, and Pass4Success practice questions were a big help. One question that had me second-guessing was about optimizing an Azure Cosmos DB solution, particularly how to use indexing policies to improve query performance. Despite my doubts, I passed!
upvoted 0 times
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Mari

8 months ago
How about questions on monitoring and optimizing throughput?
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Gregg

8 months ago
Excited to share that I passed the Azure Cosmos DB exam! The practice questions from Pass4Success were invaluable. There was a tough question on designing and implementing data distribution, specifically about choosing the right partition strategy for a global application. I wasn't completely confident, but I passed!
upvoted 0 times
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Sage

8 months ago
Are there questions on implementing server-side programming?
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Glen

8 months ago
I passed the Microsoft Azure Cosmos DB exam, and Pass4Success was instrumental. One question I found challenging was about designing and implementing data models, particularly how to use partition keys effectively. Even though I was unsure, I succeeded!
upvoted 0 times
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Alysa

9 months ago
Whew, that Azure Cosmos DB cert was tough! Grateful for Pass4Success - their materials were a lifesaver.
upvoted 0 times
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Sanjuana

9 months ago
How much emphasis is there on Cosmos DB's analytical capabilities?
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Gilma

9 months ago
Just cleared the Azure Cosmos DB exam! Pass4Success practice questions were a huge help. There was a tricky question on integrating an Azure Cosmos DB solution with Azure Functions. I wasn't sure about the best way to trigger a function from a Cosmos DB change feed, but I still made it through.
upvoted 0 times
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Matilda

9 months ago
Throughput management is a key focus. You'll see questions on provisioning and scaling RUs, implementing autoscale, and monitoring throughput usage. Understand how to optimize for cost-effective performance. Pass4Success materials had great scenarios on throughput optimization.
upvoted 0 times
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Precious

9 months ago
I recently passed the Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB exam, thanks to the practice questions from Pass4Success. One question that stumped me was about maintaining an Azure Cosmos DB solution, specifically how to handle automatic failover for high availability. Despite my uncertainty, I managed to pass!
upvoted 0 times
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Youlanda

10 months ago
Just passed the Azure Cosmos DB exam! Thanks Pass4Success for the spot-on practice questions. Saved me loads of time.
upvoted 0 times
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Zachary

10 months ago
Passing the Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB exam was a great achievement for me, and I owe a big thanks to Pass4Success for their helpful practice questions. The topic of enabling offline development by using the Azure Cosmos DB emulator was crucial for my exam preparation. One question that I recall from the exam was about setting up and using the Azure Cosmos DB emulator for offline development. Despite some initial confusion, I managed to pass the exam successfully.
upvoted 0 times
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Leota

11 months ago
The exam experience was challenging but rewarding. I'm grateful for the comprehensive preparation materials from Pass4Success that helped me pass in a short time.
upvoted 0 times
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Maurine

11 months ago
My exam experience for the Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB was successful, thanks to Pass4Success practice questions. I found the topic of implementing data access by using the Azure Cosmos DB SQL language to be particularly challenging. One question that I remember from the exam was about optimizing data access performance using the SQL language in Azure Cosmos DB. Despite some uncertainty, I was able to pass the exam.
upvoted 0 times
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Aracelis

12 months ago
Just passed the Azure Cosmos DB exam! Watch out for questions on multi-region write replication - they test your understanding of conflict resolution strategies. Brush up on choosing between strong and eventual consistency models. Big thanks to Pass4Success for their spot-on practice questions that helped me prepare quickly!
upvoted 0 times
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Kattie

12 months ago
The exam covered various consistency levels in Cosmos DB. Be prepared for scenarios where you need to select the appropriate consistency level based on application requirements. Understanding trade-offs between consistency and performance is crucial.
upvoted 0 times
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Teddy

12 months ago
I recently passed the Microsoft Designing and Implementing Cloud-Native Applications Using Microsoft Azure Cosmos DB exam with the help of Pass4Success practice questions. The exam covered topics such as designing partitioning for workloads that require multiple partition keys. One question that stood out to me was related to designing a partitioning strategy for a scenario where multiple partition keys were needed. I wasn't completely sure of the answer, but I managed to pass the exam.
upvoted 0 times
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Free Microsoft DP-420 Exam Actual Questions

Note: Premium Questions for DP-420 were last updated On Jun. 11, 2025 (see below)

Question #1

You have an Azure Cosmos DB for NoSQL account1 that is configured for automatic failover. The account1 account has a single read-write region in West US and a and a read region in East US.

You run the following PowerShell command.

What is the effect of running the command?

Reveal Solution Hide Solution
Correct Answer: B

You can use the Set-AzCosmosDBAccountRegion cmdlet to update the regions that an Azure Cosmos DB account uses. You can use this cmdlet to add a region or change the region failover order.The cmdlet requires a resource group name, an Azure Cosmos DB account name, and a list of regions in desired failover order1.

For your scenario, based on the PowerShell command, you are using the Set-AzCosmosDBAccountRegion cmdlet to update the regions for an Azure Cosmos DB account named account1 that is configured for automatic failover. The command specifies two regions: West US and East US. The effect of running the command is thatthe account will be configured for multi-region writes.

Multi-region writes is a feature of Azure Cosmos DB that allows you to write data to any region in your account and have it automatically replicated to all other regions. This feature provides high availability and low latency for write operations across multiple regions.To enable multi-region writes, you need to specify at least two regions in your account and set them as write regions2. In your command, you are setting both West US and East US as write regions by using the -IsZoneRedundant parameter with a value of $true for both regions.


Question #2

You configure multi-region writes for account1.

You need to ensure that App1 supports the new configuration for account1. The solution must meet the business requirements and the product catalog requirements.

What should you do?

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Correct Answer: D

App1 queries the con-product and con-productVendor containers.

Note: Request unit is a performance currency abstracting the system resources such as CPU, IOPS, and memory that are required to perform the database operations supported by Azure Cosmos DB.

Scenario:

Develop an app named App1 that will run from all locations and query the data in account1.

Once multi-region writes are configured, maximize the performance of App1 queries against the data in account1.

Whenever there are multiple solutions for a requirement, select the solution that provides the best performance, as long as there are no additional costs associated.


https://docs.microsoft.com/en-us/azure/cosmos-db/consistency-levels

Question #3

You have an Azure Cosmos DB Core (SQL) API account that uses a custom conflict resolution policy. The account has a registered merge procedure that throws a runtime exception.

The runtime exception prevents conflicts from being resolved.

You need to use an Azure function to resolve the conflicts.

What should you use?

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Correct Answer: D

The Azure Cosmos DB Trigger uses the Azure Cosmos DB Change Feed to listen for inserts and updates across partitions. The change feed publishes inserts and updates, not deletions.


Question #4

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?

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Correct Answer: D

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 #5

You have an Azure subscription. The subscription contains an Azure Cosmos DB for NoSQL account named account1 that hosts a container named Devices. Devices has a partition key named type.

You are evaluating the resource utilization of the query. How will the query be executed?

Reveal Solution Hide Solution
Correct Answer: C

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