Microsoft Dp-420 Cosmos db specialty Practice Exam
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Official Name: Microsoft DP-420 Azure Cosmos DB Developer Specialty
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Start NowAbout the Microsoft Dp-420 Cosmos db specialty Certification
The Microsoft Dp-420 Cosmos db specialty certification is designed for professionals who develop cloud-native applications using Azure Cosmos DB for NoSQL. they design data models, write efficient queries, manage indexing policies, and integrate with other Azure services for scalable performance. As technology evolves and industry demands grow more complex; this credential validates your ability to apply real-world skills and knowledge using Microsoft tools and frameworks. Earning the certification positions you as a trusted expert, capable of solving high-impact challenges and contributing to secure, scalable, and efficient systems.
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Test Your Knowledge of Microsoft Dp-420 Cosmos db specialty
Question #1
A developer needs to design a globally distributed application using Azure Cosmos DB.
Which feature ensures low-latency reads across regions?
A) Multi-region replication
B) Partition key tuning
C) Change feed
D) Indexing policy
Solution
Correct answers: A – Explanation:
Multi-region replication allows data to be read from the nearest region, reducing latency for global applications.
Question #2
A team wants to implement conflict resolution for multi-region writes in Azure Cosmos DB.
Which method supports custom resolution logic?
A) Stored procedures with custom conflict resolution policy
B) Automatic timestamp-based resolution
C) Manual data merge
D) Index override
Solution
Correct answers: A – Explanation:
Stored procedures can be used with a custom conflict resolution policy to define how conflicts are resolved during multi-region writes.
Question #3
A developer needs to optimize query performance in a Cosmos DB container.
Which feature should be configured?
A) Indexing policy
B) Change feed
C) Consistency level
D) Partition key
Solution
Correct answers: A – Explanation:
Indexing policy determines which properties are indexed and how queries are optimized for performance.
Question #4
An application requires real-time processing of data changes in Cosmos DB.
Which feature supports this requirement?
A) Change feed
B) Time-to-live
C) Multi-region writes
D) Stored procedures
Solution
Correct answers: A – Explanation:
Change feed provides a continuous stream of changes in the container, enabling real-time processing and event-driven architectures.
Question #5
A developer wants to reduce request units (RU/s) usage for frequent queries.
Which strategy helps achieve this?
A) Use dedicated containers with optimized indexing
B) Enable multi-region writes
C) Increase consistency level
D) Disable partitioning
Solution
Correct answers: A – Explanation:
Optimizing indexing and using dedicated containers can reduce RU/s consumption for frequent queries.
Question #6
A team needs to implement a partitioning strategy for a high-throughput Cosmos DB container.
Which factor is most important when choosing a partition key?
A) Even distribution of data and access patterns
B) Alphabetical sorting
C) Data encryption
D) Indexing depth
Solution
Correct answers: A – Explanation:
Choosing a partition key that evenly distributes data and access ensures scalability and performance in high-throughput scenarios.
Question #7
A developer wants to integrate Cosmos DB with Azure Functions for event-driven processing.
Which feature enables this integration?
A) Change feed trigger
B) Stored procedure binding
C) Indexing override
D) Indexing policy
Solution
Correct answers: A – Explanation:
Change feed triggers in Azure Functions allow automatic execution of code in response to data changes in Cosmos DB.
Question #8
A company wants to ensure data durability and availability in Cosmos DB.
Which consistency level provides the strongest guarantees?
A) Strong
B) Session
C) Bounded staleness
D) Eventual
Solution
Correct answers: A – Explanation:
Multi-region replication allows data to be read from the nearest region, reducing latency for global applications.
Question #9
A developer needs to implement role-based access control for Cosmos DB resources.
Which Azure feature supports this?
A) Azure RBAC
B) Custom stored procedures
C) Indexing policy
D) Partition key override
Solution
Correct answers: A – Explanation:
Azure RBAC allows fine-grained access control to Cosmos DB resources based on user roles and permissions.
Question #10
A team wants to monitor performance and troubleshoot issues in Cosmos DB.
Which tool provides detailed metrics and diagnostics?
A) Azure Monitor integration
B) Indexing policy
C) Consistency override
D) Stored procedure logs
Solution
Correct answers: A – Explanation:
Azure Monitor integration provides telemetry, diagnostics, and performance metrics for Cosmos DB containers and operations.
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