PL-400 Exam Flashcards

Q: What skills does PL-400 measure as of March 19, 2026?

Microsoft lists six areas: Create a technical design, Build Power Platform solutions, Implement Power Apps improvements, Extend the user experience, Extend the platform, and Develop integrations. Extend the platform has the largest published weight at 30–35%.

Q: What score is required to pass PL-400?

A scaled score of 700 or greater is required. Microsoft states that 700 is not necessarily equal to 70% of the available points because technical exam scores are scaled for question difficulty.

Q: How many questions are on PL-400?

A fixed PL-400 question count is not published by Microsoft. Microsoft says most certification exams typically contain 40–60 questions, but the number can vary as exams are updated.

Q: How much time is provided for PL-400?

The official Power Platform Developer Associate page provides 100 minutes to complete PL-400. Seat time can include additional time for instructions and other exam activities.

Q: What is the Microsoft exam retake wait for PL-400?

After the first unsuccessful attempt, the wait is 24 hours. A 14-day wait applies between subsequent attempts, with no more than five attempts on the same exam within 12 months from the first attempt.

Q: How long is the Power Platform Developer Associate certification valid?

Microsoft lists a 12-month renewal frequency. Eligible role-based certifications can be renewed at no cost by passing the online renewal assessment on Microsoft Learn.

Question 1

What should be checked before designing a custom Power Platform extension?

Accepted Answer

Confirm whether supported out-of-the-box features already meet the requirement. Custom code adds lifecycle, security, testing, and support obligations.

Question 2

Where should a rule run when every Dataverse client must enforce it?

Accepted Answer

Use server-side Dataverse logic, such as a plug-in, so the rule also applies to API calls and other clients that bypass a specific app form.

Question 3

When is a Dataverse virtual table a good design choice?

Accepted Answer

Choose it when external data must appear as Dataverse rows without copying that data into Dataverse. Validate feature limitations before selecting it.

Question 4

What workload favors a Dataverse elastic table?

Accepted Answer

Very large or rapidly growing data with high read/write throughput and low-latency needs. Elastic tables scale horizontally, and performance depends on a consistent partitioning strategy.

Question 5

What design boundary does a Power Platform data policy enforce?

Accepted Answer

It controls which connectors can be used together and which are blocked, reducing unintended movement of organizational data between services.

Question 6

What does authorization decide in a solution design?

Accepted Answer

Authorization determines what an authenticated identity may access or do. In Dataverse, roles, teams, business units, and row sharing contribute to that decision.

Question 7

How does least privilege apply to a Dataverse security role?

Accepted Answer

Grant only the table privileges, access depths, and other permissions the component or user actually needs. Avoid broad roles as a shortcut.

Question 8

Why place environment-specific settings in environment variables?

Accepted Answer

They let the same solution use different configuration values after deployment without editing the solution's logic for each environment.

Question 9

What ALM problem does a connection reference solve?

Accepted Answer

It lets solution components refer to a connection indirectly, so a suitable connection can be supplied when the solution moves to another environment.

Question 10

What does a solution dependency reveal?

Accepted Answer

It shows that one solution component requires another component. Resolve required dependencies before deleting components or deploying the solution.

Question 11

Which solution layer usually controls a component's runtime behavior?

Accepted Answer

The active top layer normally controls it. Forms, model-driven apps, and site maps can use merge behavior instead of simple top-wins behavior.

Question 12

What is the core purpose of Power Platform Pipelines?

Accepted Answer

They provide a governed, in-product process for deploying solutions through configured environments with validation and deployment controls.

Question 13

What do Power Platform Build Tools add to Azure DevOps?

Accepted Answer

They add Power Platform-specific tasks for source synchronization, solution artifacts, checks, environment operations, and downstream deployment automation.

Question 14

Why use a canvas component library?

Accepted Answer

It provides centrally managed reusable components across apps and notifies app makers when published component updates are available.

Question 15

What does delegation do in a canvas app query?

Accepted Answer

It sends supported filtering or sorting work to the data source, allowing the query to evaluate the full data set instead of a limited local subset.

Question 16

Why is a delegation warning a correctness risk?

Accepted Answer

A nondelegable query is evaluated locally against only the configured row limit—500 by default and at most 2,000—so matching rows beyond that subset can be missed.

Question 17

What does Power Apps Monitor expose during troubleshooting?

Accepted Answer

It records app events and data operations, including requests, responses, timing, and errors, so a maker can trace observed behavior to its source.

Question 18

What is the purpose of Power Fx IfError?

Accepted Answer

It detects an error and evaluates a corresponding replacement or recovery formula, allowing the app to handle failure deliberately.

Question 19

How can a canvas app start reusable service-side automation?

Accepted Answer

Add a Power Automate cloud flow to the app and invoke it from Power Fx, passing only the inputs the flow requires.

Question 20

How should modern model-driven app script obtain formContext?

Accepted Answer

Call executionContext.getFormContext(). The global Xrm.Page form context is deprecated for new client scripting.

Question 21

Why pass executionContext to a model-driven form event handler?

Accepted Answer

It identifies the event and supplies the relevant form or grid context, so the handler does not depend on a global form reference.

Question 22

What is Xrm.WebApi used for in client scripting?

Accepted Answer

It provides supported client methods for Dataverse data operations, including creating, retrieving, updating, and deleting rows.

Question 23

What can define custom command behavior in a model-driven app?

Accepted Answer

Modern command buttons can use Power Fx, while JavaScript remains available when the command requires supported client-side code.

Question 24

Which Client API method opens a custom page?

Accepted Answer

Use Xrm.Navigation.navigateTo with a page input that identifies the custom page and navigation options for the target presentation.

Question 25

When does a PCF control's updateView method run?

Accepted Answer

The framework calls it when values in the control's property bag or relevant context change, so the control can render the current state.

Question 26

What must a PCF control do after a user changes a bound output?

Accepted Answer

Call the notifyOutputChanged callback received during init. The framework can then call getOutputs to collect the new bound value.

Question 27

When is the PreValidation plug-in stage useful?

Accepted Answer

For the initial operation, it can reject an invalid request before the main operation and before the database transaction begins.

Question 28

Why modify Target during PreOperation?

Accepted Answer

PreOperation runs inside the transaction before the main write, so changing Target values there can affect the row being saved without issuing another update.

Question 29

What is the tradeoff of an asynchronous PostOperation plug-in?

Accepted Answer

It runs after the originating transaction and avoids delaying the save, but it cannot roll back that completed transaction.

Question 30

What do plug-in pre-images and post-images represent?

Accepted Answer

A pre-image captures selected row values before the operation; a post-image captures selected values after the operation where that image is supported.

Question 31

What do filtering attributes control on an Update plug-in step?

Accepted Answer

They make the step run only when one of those columns is included in the update payload. Inclusion triggers the step even if the supplied value is unchanged.

Question 32

What does IPluginExecutionContext describe?

Accepted Answer

It describes the current Dataverse event, including message, stage, depth, caller, parameters, and other execution data available to the plug-in.

Question 33

Why use ITracingService in a Dataverse plug-in?

Accepted Answer

It records diagnostic trace messages that help reconstruct plug-in execution and troubleshoot failures without relying on interactive debugging.

Question 34

What does IOrganizationService provide to a plug-in?

Accepted Answer

It provides supported Dataverse operations for working with rows and executing organization requests under an appropriate service context.

Question 35

What platform capability does a Dataverse custom API add?

Accepted Answer

It defines a solution-aware Dataverse message with typed request and response values that callers can invoke through supported Dataverse APIs.

Question 36

How does a bound custom API differ from an unbound one?

Accepted Answer

A bound API is associated with a table row or table collection. An unbound API is a global operation with no table binding.

Question 37

What does an OpenAPI definition contribute to a custom connector?

Accepted Answer

It describes the REST API's operations, parameters, and schemas so Power Apps and Power Automate can expose those operations as connector actions or triggers.

Question 38

What must custom connector authentication define?

Accepted Answer

It must define how the connector obtains and sends credentials accepted by the target API, such as OAuth 2.0 or an API key.

Question 39

What are custom connector policy templates for?

Accepted Answer

They alter connector behavior at runtime, such as routing a request or setting values, without changing the underlying API implementation.

Question 40

How should a Dataverse client respond to HTTP 429?

Accepted Answer

Pause for the duration in the Retry-After response header, then retry according to a bounded retry strategy instead of immediately resending the request.

Question 41

Why authenticate an Azure Function to Dataverse with managed identity?

Accepted Answer

It avoids storing an application secret in code or configuration. The identity still needs an authorized Dataverse application user and appropriate privileges.

Question 42

What do secure inputs and outputs protect in a cloud flow?

Accepted Answer

They prevent selected trigger or action data from being displayed in run history, reducing exposure of secrets and other sensitive values.

Question 43

When should a child flow be used?

Accepted Answer

Use it to centralize a reusable sequence called by parent flows. Create the parent and child directly in the same solution for supported linking and deployment.

Question 44

What does registering a Dataverse Azure service endpoint establish?

Accepted Answer

It defines the Azure messaging destination that a registered Dataverse event step can notify with execution context data.

Question 45

What is IServiceEndpointNotificationService used for?

Accepted Answer

An Azure-aware plug-in uses it to request that Dataverse post the current event execution context to a configured Azure service endpoint.

Question 46

When is a Dataverse webhook an appropriate event destination?

Accepted Answer

Use it when Dataverse should send event context to an HTTPS endpoint that can authenticate the request and respond within the configured execution model.

Question 47

What integration pattern favors Azure Event Hubs?

Accepted Answer

Choose Event Hubs when Dataverse events feed a high-throughput stream that multiple consumers can process for telemetry or event analytics.

Question 48

How does Dataverse Web API change tracking support incremental sync?

Accepted Answer

Request tracked changes, store the opaque delta link returned by Dataverse, and use that link later to retrieve changes since the previous completed synchronization round.

Question 49

Why define an alternate key for an external business identifier?

Accepted Answer

It lets integration code address a Dataverse row by a unique external value when the external system does not store the Dataverse GUID.

Question 50

What does Upsert do during Dataverse synchronization?

Accepted Answer

It updates a matching row or creates one when no match exists. Integrations commonly pair it with an alternate key when the Dataverse GUID is unknown.

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