REVIEW MCD-LEVEL-2 GUIDE | MCD-LEVEL-2 VALID TEST PREP

Review MCD-Level-2 Guide | MCD-Level-2 Valid Test Prep

Review MCD-Level-2 Guide | MCD-Level-2 Valid Test Prep

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MuleSoft Certified Developer - Level 2 (Mule 4) Sample Questions (Q14-Q19):

NEW QUESTION # 14
An order processing system is composed of multiple Mule application responsible for warehouse, sales and shipping. Each application communication using Anypoint MQ. Each message must be correlated against the original order ID for observability and tracing.
How should a developer propagate the order ID as the correlation ID across each message?

  • A. Set a custom Anypoint MQ user property to propagate the order ID and set the correlation ID in the receiving applications.
  • B. Use the default correlation ID, Anypoint MQ will sutomatically propagate it.
  • C. Use the underlying HTTP request of Anypoint MQ to set the 'X-CORRELATION_ID' header to the order ID
  • D. Wrap all Anypoint MQ Publish operations within a With CorrelationID scope from the Tracing module, setting the correlation ID to the order ID

Answer: D

Explanation:
Explanation
To propagate the order ID as the correlation ID across each message using Anypoint MQ, the developer should wrap all Anypoint MQ Publish operations within a With CorrelationID scope from the Tracing module, setting the correlation ID to the order ID. The With CorrelationID scope allows setting a custom correlation ID for any event that occurs within it. The Tracing module also enables distributed tracing across different Mule applications and services using Anypoint Monitoring. References:
https://docs.mulesoft.com/tracing-module/1.0/tracing-module-reference#with-correlation-id-scope
https://docs.mulesoft.com/tracing-module/1.0/tracing-module-concepts


NEW QUESTION # 15
Refer to the exhibit.

A Mule application pom.xml configures the Maven Resources plugin to exclude parsing binary files in the project's src/main/resources/certs directory.
Which configuration of this plugin achieves a successful build?

  • A.
  • B.
  • C.
  • D.

Answer: A

Explanation:
Explanation
To configure the Maven Resources plugin to exclude parsing binary files in the project's src/main/resources/certs directory, option C should be used. This option specifies that any files with .cer or .jks extensions under the certs directory should be excluded from filtering. Filtering is a process of replacing placeholders with actual values in resource files during the build process. Binary files should not be filtered because they may become corrupted or unusable. References:
https://maven.apache.org/plugins/maven-resources-plugin/examples/filter.html
https://maven.apache.org/plugins/maven-resources-plugin/examples/include-exclude.html


NEW QUESTION # 16
Two APIs are deployed to a two-node on-prem cluster. Due to a requirements change, the two APIs must communicate to exchange data asynchronously.

  • A. It is not possible to use the VM Connector since the APIs are running in a cluster mode and each mode has it own set of VM Queues
  • B. If the two APIs use the same domain, the VM Connector can be leveraged
  • C. Instead of using the VM Connector use <flow-ref>directly
  • D. The VM Connector is used to inter-application communication, so it is not possible to use the VM Connector

Answer: B

Explanation:
Explanation
To communicate asynchronously between two APIs deployed to a two-node on-prem cluster, the developer can use the VM Connector if the two APIs use the same domain. The VM Connector allows passing messages between different Mule applications within a single Mule runtime instance or across different instances using shared memory or persistent storage. If two APIs are deployed under the same domain, they can share resources such as VM queues and communicate asynchronously using VM Connector operations. References:
https://docs.mulesoft.com/mule-runtime/4.3/vm-connector
https://docs.mulesoft.com/mule-runtime/4.3/shared-resources


NEW QUESTION # 17
Refer to the exhibit.
What required changes can be made to give a partial successful response in case the United Airlines API returns with a timeout?

  • A. Add Flow Reference components inside a Try scope
    Set the payload to a default value '' inside the error handler using the On Error Propagate scope
  • B. Add a Scatter-gather component inside a Try scope.
    Set the payload to a default value 'Error' inside the error handler using the On Error Propagate scope.
  • C. Add a Scatter-Gather component inside a Try scope.
    Set the payload to a default value 'Error'' inside the error handler using the On Error Continue scope.
  • D. Add Flow Reference components inside a Try scope.
    Set the payload to a default value'' insider the error handler using the ON Error Continue scope

Answer: C

Explanation:
Explanation
To give a partial successful response in case the United Airlines API returns with a timeout, the developer should add a Scatter-Gather component inside a Try scope, and set the payload to a default value 'Error' inside the error handler using the On Error Continue scope. A Scatter-Gather component allows sending multiple requests concurrently and aggregating the responses into an array. A Try scope allows handling errors that occur within it using an error handler. An On Error Continue scope allows continuing the flow execution after handling an error. Therefore, by using these components, the developer can send requests to both APIs in parallel, handle any timeout errors from United Airlines API, and return a partial response with a default value for that API. References: https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-concept
https://docs.mulesoft.com/mule-runtime/4.3/try-scope-concept
https://docs.mulesoft.com/mule-runtime/4.3/on-error-continue-concept


NEW QUESTION # 18
Which pattern should be used to invoke multiple HTTP APIs in parallel and roll back failed requests in sequence?

  • A. Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes
  • B. VM queues as a reliability pattern with error handlers to roll back any requests
  • C. A database as a transactional outbox and an Until Successful router to retry any requests
  • D. A Parallel for Each scope with each HTTP request wrapped in a Try scope

Answer: A

Explanation:
Explanation
To invoke multiple HTTP APIs in parallel and roll back failed requests in sequence, the developer should use a Scatter-Gather router as a central Saga orchestrator for all API requests with compensating actions for failing routes. A Scatter-Gather router executes multiple routes concurrently and aggregates the results. A Saga orchestrator coordinates a series of actions across different services and handles failures by executing compensating actions. Therefore, using a Scatter-Gather router as a Saga orchestrator allows invoking multiple HTTP APIs in parallel and rolling back any failed requests in sequence. References:
https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-concept
https://docs.mulesoft.com/mule-runtime/4.3/saga


NEW QUESTION # 19
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