Mulesoft MuleSoft Certified Developer MCD-LEVEL-2 Questions & Answers

• Question 21:

  A developer has created the first version of an API designed for business partners to work commodity prices.

  What should developer do to allow more than one major version of the same API to be exposed by the implementation?

  A. In Design Center, open the RAML and modify each operation to includethe major version number

  B. In Anypoint Studio, generate scaffolding from the RAML, and the modify the in the generated flows to include a parameter to replace the version number

  C. In Design Center, open the RAML and modify baseUn to include a variable that indicates the version number

  D. In Anypoint Studio, generate scaffolding from the RAML, and then modify the flow names generated by APIKit to include a variable with the major version number

  Correct Answer: C

  To allow more than one major version of the same API to be exposed by the implementation, the developer should modify the baseUri property in the RAML file to include a variable that indicates the version number. The baseUri property defines the base URL of the API and can include variables that are replaced with actual values when mocking or deploying the API. By using a variable for the version number, the developer can expose different versions of the API using different base URLs and avoid conflicts or confusion. References: https://docs.mulesoft.com/api-designer/design-modify-raml-specs#baseuri https://docs.mulesoft.com/api-manager/2.x/api-versioning

• Question 22:

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

  A. A database as a transactional outbox and an Until Successful router to retry any requests

  B. A Parallel for Each scope with each HTTP request wrapped in a Try scope

  C. Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes

  D. VM queues as a reliability pattern with error handlers to roll back any requests

  Correct Answer: C

  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

• Question 23:

  Which statement is true when working with correlation IDS?

  A. The HTTP Listener regenerates correlation IDs regardless of the HTTP request

  B. The Anypoint MQ Connector automatically propagates correlation IDS

  C. The HTTP Listener generates correlation IDS unless a correlation ID is received in the HTTP request

  D. The VM Connector does not automatically propagate correction IDs

  Correct Answer: C

  When working with correlation IDs, the HTTP Listener generates correlation IDs unless a correlation ID is received in the HTTP request. In that case, it propagates the received correlation ID throughout the flow execution. Correlation IDs are used to track events across different flows or applications. References:https://docs.mulesoft.com/mule-runtime/4.3/about-mule-message#message-attributes

• Question 24:

  Which plugin or dependency is required to unit test modules created with XML SDK?

  A. XMLUnit

  B. Junit

  C. MUnit Extensions Maven plugin

  D. MUnit Maven plugin

  Correct Answer: C

  To unit test modules created with XML SDK, the developer needs to use the MUnit Extensions Maven plugin. This plugin allows testing XML SDK modules using MUnit by adding a dependency to the module under test and using a custom processor tag to invoke it. References:https://docs.mulesoft.com/mule-sdk/1.1/xml-sdk#testing

• Question 25:

  When registering a client application with an existing API instance or API Group instance, what is required to manually approve or reject request access?

  A. To configure the SLA tier for the application and have the role of Organization Administrator, API Manager Environment Administrator, or the Manage Contacts permission

  B. To configure the SLA tier for the application and have the Exchange Administrator permission

  C. To configure the SLA tier for the application

  D. To only have Exchange Administrator permission

  Correct Answer: A

  To manually approve or reject request access when registering a client application with an existing API instance or API Group instance, it is required to configure the SLA tier for the application and have one of the following roles or

  permissions:

  Organization Administrator, API Manager Environment Administrator, or Manage Contracts permission. These roles or permissions allow managing client applications and contracts in API Manager.

  References:https://docs.mulesoft.com/api-manager/2.x/client-applications#managing-client-applications-and-contracts

• Question 26:

  A company has been using CI/CD. Its developers use Maven to handle build and deployment activities.

  What is the correct sequence of activities that takes place during the Maven build and deployment?

  A. Initialize, validate, compute, test, package, verify, install, deploy

  B. Validate, initialize, compile, package, test, install, verify, verify, deploy

  C. Validate, initialize, compile, test package, verify, install, deploy

  D. Validation, initialize, compile, test, package, install verify, deploy

  Correct Answer: C

  The correct sequence of activities that takes place during the Maven build and deployment is validate, initialize, compile, test package, verify, install, deploy. These are Maven lifecycle phases that define a sequence of goals to execute during a build process. Each phase represents a stage in the build lifecycle and can have zero or more goals bound to it. References:https://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html

• Question 27:

  Which pattern can a web API use to notify its client of state changes as soon as they occur?

  A. HTTP Webhock

  B. Shared database trigger

  C. Schedule Event Publisher

  D. ETL data load

  Correct Answer: A

  A web API can use HTTP Webhook to notify its client of state changes as soon as they occur. A webhook is an HTTP callback that allows an API to send real-time notifications to another system or application when an event happens. The client registers a URL with the API where it wants to receive notifications, and then the API sends an HTTP request to that URL with information about the event. References:https://docs.mulesoft.com/connectors/webhook/webhook-connector

• Question 28:

  A Mule application need to invoice an API hosted by an external system to initiate a process. The external API takes anywhere between one minute and 24 hours to compute its process.

  Which implementation should be used to get response data from the external API after it completes processing?

  A. Use an HTTP Connector to invoke the API and wait for a response

  B. Use a Scheduler to check for a response every minute

  C. Use an HTTP Connector inside Async scope to invoice the API and wait for a response D. Expose an HTTP callback API in Mule and register it with the external system

  Correct Answer: D

  To get response data from the external API after it completes processing, the developer should expose an HTTP callback API in Mule and register it with the external system. This way, the external API can invoke the callback API with the response data when it is ready, instead of making the Mule application wait for a long time or poll for a response repeatedly. References:https://docs.mulesoft.com/mule-runtime/4.3/http-listener-ref#callback

• Question 29:

  A Mule application for processing orders must log the order ID for every log message output.

  What is a best practice to enrich every log message with the order ID?

  A. Use flow variables within every logger processor to log the order ID

  B. Set a flow variable and edit the log4/2.xml file to output the variable as part of the message pattern

  C. Create a custom XML SDK component to wrap the logger processor and automatically add the order ID within the connector

  D. Use the Tracing module to set logging variables with a Mapped Diagnostic Context

  Correct Answer: D

  To enrich every log message with the order ID, the developer should use the Tracing module to set logging variables with a Mapped Diagnostic Context (MDC). The Tracing module allows adding custom key-value pairs to log messages using MDC variables. The developer can use Set Logging Variables operation to set the order ID as an MDC variable and then use it in any logger processor within the same thread or event. References:https://docs.mulesoft.com/tracing-module/1.0/tracing-module-reference#set-logging-variables

• Question 30:

  A new Mule project has been created in Anypoint Studio with the default settings.

  Which file inside the Mule project must be modified before using Maven to successfully deploy the application?

  A. Settings.xml

  B. Config.yaml

  C. Pom.xml

  D. Mule.artificact.json

  Correct Answer: C

  To use Maven to successfully deploy the application, the developer needs to modify the pom.xml file inside the Mule project. The pom.xml file contains the configuration and dependencies of the Mule application, as well as the deployment information such as theCloudHub region, environment, and worker size. The developer needs to specify these properties in the pom.xml file before using Maven to deploy the application. References:https://docs.mulesoft.com/mule-runtime/4.3/mmp-concept#application-deployment-descriptor