Sample Questions and Answers
What is the main purpose of a Mule application?
A. To store customer data in Salesforce
B. To define how data is retrieved, transformed, and transmitted
C. To manage server memory allocation
D. To generate HTML reports
Answer: B
Explanation: A Mule application allows developers to define flows that retrieve, transform, and transmit data between systems using APIs and connectors.
What does the Transform Message component in MuleSoft do?
A. Sends data to external APIs
B. Handles HTTP errors
C. Converts data between formats using DataWeave
D. Authenticates Mule apps
Answer: C
Explanation: The Transform Message component uses DataWeave to convert data between different formats like JSON, XML, CSV, etc.
What is the role of a connector in MuleSoft?
A. Hosts APIs
B. Provides a UI interface
C. Enables communication with external systems
D. Runs batch jobs
Answer: C
Explanation: Connectors are pre-built modules that allow Mule applications to communicate with external systems like databases, APIs, Salesforce, etc.
What language is used in the Transform Message component?
A. Java
B. Groovy
C. DataWeave
D. MQL
Answer: C
Explanation: DataWeave is the expression language used in MuleSoft for transforming data.
What is the correct HTTP status code for a successful POST request that created a resource?
A. 200
B. 201
C. 400
D. 404
Answer: B
Explanation: A 201 Created status code indicates that a new resource has been successfully created on the server.
What is a flow in MuleSoft?
A. A memory allocation block
B. A reusable global variable
C. A sequence of message processors
D. A data encryption standard
Answer: C
Explanation: A flow is a sequence of message processors that define the processing logic in a Mule application.
Which connector would you use to connect to Salesforce in a Mule application?
A. HTTP Connector
B. Salesforce Connector
C. File Connector
D. Database Connector
Answer: B
Explanation: The Salesforce Connector provides out-of-the-box integration with Salesforce APIs.
How does MuleSoft handle errors by default?
A. It retries the operation indefinitely
B. It logs the error and continues
C. It stops the flow and throws an exception
D. It redirects to a custom error page
Answer: C
Explanation: By default, if an error occurs in a flow, MuleSoft throws an exception unless error handling is explicitly defined.
What is the scope of a Flow Variable?
A. Application-wide
B. Until the session ends
C. Within the flow and its sub-flows
D. Across all Mule applications
Answer: C
Explanation: Flow variables are available within the current flow and are also accessible in referenced sub-flows.
Which is true about DataWeave scripts?
A. They are written in XML
B. They always output XML
C. They can read and transform multiple data formats
D. They can only be used in Java apps
Answer: C
Explanation: DataWeave supports various formats like JSON, XML, CSV, and allows transforming data between them.
What does a sub-flow in MuleSoft NOT have?
A. Its own error handler
B. Ability to reuse logic
C. Access to parent flow variables
D. Invocation from a Flow Reference
Answer: A
Explanation: Sub-flows do not have their own error handling scopes; they use the parent flow’s error handling.
What is the default MIME type output by DataWeave when unspecified?
A. text/html
B. application/xml
C. application/json
D. text/plain
Answer: C
Explanation: If the output type is not defined explicitly, DataWeave defaults to application/json.
Which component is used to log payload or variables?
A. Print Component
B. Debugger
C. Logger
D. Alert
Answer: C
Explanation: The Logger component is used to output information such as variable values or payloads to logs.
What does the HTTP Listener require at a minimum to function?
A. Port number and method
B. Host, port, and path
C. Only a host
D. Only a port
Answer: B
Explanation: An HTTP Listener must define the host, port, and path to receive requests.
What is the primary role of APIKit Router?
A. Store logs
B. Forward HTTP requests to databases
C. Route HTTP requests to corresponding flows based on RAML
D. Encrypt API responses
Answer: C
Explanation: APIKit Router maps requests to Mule flows using the RAML specification.
What does the choice router do in MuleSoft?
A. Sends output to all possible routes
B. Picks one path based on an expression
C. Logs all request data
D. Encrypts payloads
Answer: B
Explanation: The choice router evaluates conditions and routes the message to the first matching condition.
How do you set a session variable in MuleSoft?
A. Using set-variable
B. Using set-session-variable
C. Using session-set-variable
D. Using flowVar
Answer: B
Explanation: Session variables are set using the set-session-variable component.
What is the correct syntax for accessing a field called name in a JSON payload using DataWeave?
A. payload.name
B. msg.name
C. body.name
D. var.name
Answer: A
Explanation: In DataWeave, the payload is accessed using the dot notation like payload.name.
Which component allows you to call another flow in Mule?
A. HTTP Request
B. Flow Reference
C. Database Query
D. Logger
Answer: B
Explanation: The Flow Reference component is used to invoke another flow within the same Mule application.
What is the output of the DataWeave expression: [“a”, “b”, “c”] joinBy “-“?
A. abc
B. a-b-c
C. a, b, c
D. [a, b, c]
Answer: B
Explanation: The joinBy function joins elements of a list using the specified separator.
What is a RAML file used for in MuleSoft?
A. Defining security rules
B. Modeling APIs
C. Scheduling flows
D. Logging errors
Answer: B
Explanation: RAML (RESTful API Modeling Language) is used to define and document REST APIs in MuleSoft.
Which Mule event attribute holds the main data being processed?
A. session
B. attributes
C. payload
D. context
Answer: C
Explanation: The payload holds the core data that is transformed and routed in a Mule flow.
What does dw::Core::Strings::upper do in DataWeave?
A. Converts string to title case
B. Converts string to uppercase
C. Reverses string
D. Encrypts string
Answer: B
Explanation: The upper function converts a string to all uppercase characters.
Which error type is thrown when a required query param is missing in an APIKit-based flow?
A. MULE:CONNECTIVITY
B. HTTP:NOT_FOUND
C. APIKIT:MISSING_PARAMETER
D. TRANSFORM:ILLEGAL_ARGUMENT
Answer: C
Explanation: APIKit throws the APIKIT:MISSING_PARAMETER error when a required parameter is not provided.
What’s the use of until-successful scope?
A. Runs flows simultaneously
B. Repeats an operation until it succeeds
C. Caches the output of a request
D. Runs in a separate thread
Answer: B
Explanation: The until-successful scope retries an operation until it completes without error or max retries are reached.
How do you handle errors in a Mule application?
A. Using Try-Catch blocks
B. Error Handler scope
C. Set Logger
D. Scheduler component
Answer: B
Explanation: MuleSoft provides Error Handler scopes like On Error Continue and On Error Propagate for handling errors gracefully.
What does dw::Core::Arrays::filter return?
A. A string
B. A number
C. A filtered array
D. A map
Answer: C
Explanation: The filter function returns a new array containing only elements that match a specified condition.
What is the purpose of On Error Propagate?
A. Stops the flow and returns a custom error response
B. Ignores the error and continues
C. Logs only
D. Automatically retries the operation
Answer: A
Explanation: On Error Propagate handles the error and then propagates it to the next layer, often triggering an error response.
Which transport protocol is NOT supported natively by MuleSoft?
A. FTP
B. HTTP
C. SOAP
D. SMTP
Answer: C
Explanation: SOAP is not a transport protocol; it’s a messaging protocol. MuleSoft supports HTTP, FTP, SMTP, etc.
How can you deploy Mule applications to CloudHub?
A. Using GitHub
B. Using Runtime Manager in Anypoint Platform
C. Only through CLI
D. Manually copying to a server
Answer: B
Explanation: CloudHub deployments are managed through Anypoint Platform’s Runtime Manager UI or via CI/CD tools.
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