Free Mule-Dev-201 sample questions

Correct answer: Experience API Layer

The Experience API layer is designed to expose data in a way that is easily consumable by specific end-user channels (like mobile apps or web portals), insulating them from changes in the underlying Process or System APIs. System APIs access core systems, while Process APIs orchestrate data.

Correct answer: /orders: /{orderId}:

In RAML, URI parameters are defined by enclosing the parameter name in curly braces, such as `/{orderId}`. This denotes that `orderId` is a variable part of the URI path used to identify a specific resource.

Correct answer: The variable is accessible in the Subflow and retains its value.

Variables in Mule 4 are scoped to the Mule Event. Since a Subflow processes the same Mule Event as the calling flow (it runs in the same thread and context), any variables set in the calling flow are fully accessible and modifiable within the Subflow.

Correct answer: %dw 2.0 output application/json --- payload.Customers.*Customer map (item) -> { name: item.Name, email: item.Email }

The multi-value selector `.*Customer` retrieves all Customer elements as an array. The `map` function then iterates over this array to transform each item into the target JSON structure. This is the correct way to handle repeated XML elements in DataWeave 2.0.

Correct answer: The flow throws a `MULE:COMPOSITE_ROUTING` error and enters error handling.

In a Scatter-Gather router, if any route fails, the router catches the exception and, after all routes complete (or timeout), throws a `MULE:COMPOSITE_ROUTING` error. The flow processing stops and transfers to the error handler, where the composite error object contains results from successful routes and exceptions from failed ones.

Correct answer: Add a key-value pair to the Headers section: Key `Authorization`, Value `#[vars.authToken]`.

The Headers section of the HTTP Request configuration allows DataWeave expressions. Using `#[vars.authToken]` dynamically retrieves the value from the Mule variable and assigns it to the `Authorization` header key.