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

• Question 51:

  A scatter-gather router is configured with four routes:Route A, B, C and D.

  Route C false.

  A. Error,errorMesage.payload.results [`2']

  B. Payload failures[`2']

  C. Error,errorMessage,payload.failures[`2']

  D. Payload [`2']

  Correct Answer: C

  The result of accessing route C failure is Error,errorMessage,payload.failures[`2']. This is because a scatter-gather router returns an aggregated message that contains an array of results from each route and an array of failures from each route. The failures array contains error objects with information about each failed route execution. To access route C failure, which is the third route (index 2), the developer needs to use Error.errorMessage.payload.failures[`2'] expression.

  References:https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-reference#scatter-gather-output

• Question 52:

  A Mule application defines as SSL/TLS keystore properly `tis,keystore.keyPassword'' as secure.

  How canthis property be referenced to access its value within the application?

  A. #{secure::tiskeystore,keyPassowrd}

  B. ${secure::tiskeystore,keyPassowrd}

  C. ${secure::tiskeystore,keyPassowrd}

  D. p{secure::tiskeystore,keyPassowrd}

  Correct Answer: B

  secure::tiskeystore,keyPassowrdShortExplanationofCorrectAnswerOnly:Toreferenceasecur epropertyvaluewithintheapplication,thedeveloperneedstousethesyntax{secure::}. In this case, the property name is tiskeystore,keyPassword, so the correct syntax is ${secure::tiskeystore,keyPassowrd}. References: https://docs.mulesoft.com/mule-runtime/4.3/secure-configuration-properties#referencing-secure-properties

• Question 53:

  What is the MuleSoft recommended method to encrypt sensitive property data?

  A. The encryption key and sensitive data should be different for each environment

  B. The encryption key should be identical for all environments

  C. The encryption key should be identical for all environments and the sensitive data should be different for each environment

  D. The encryption key should be different for each environment and the sensitive data should be the same for all environments

  Correct Answer: A

  The MuleSoft recommended method to encrypt sensitive property data is to use the Secure Properties Tool that comes with Anypoint Studio. This tool allows encrypting properties files with a secret key and then decrypting them at runtime using the same key. The encryption key and sensitive data should be different for each environment to ensure security and avoid accidental exposure of sensitive data. References:https://docs.mulesoft.com/mule-runtime/4.3/secure-configuration-properties

• Question 54:

  Refer to the exhibit.

  

  A developer generates the base scaffolding for an API in Anypoint Studio. Which HTTP status code is returned while testing using the API Kit console if no values are entered in client-secret?

  A. HTTP status code:200

  B. HTTP status code:403

  C. HTTP status code:400

  D. HTTP status code:500

  Correct Answer: B

  Based on the code snippet and schema.json file below, when testing using the API Kit console if no values are entered in client-secret, HTTP status code 403 (FORBIDDEN) is returned. This is because client-secret is defined as a required header parameter in schema.json file, which means that it must be present in every request. If no values are entered in client-secret, then it is equivalent to omitting this header parameter, which violates the schema and causes APIKit Router to return HTTP status code 403. References:https://docs.mulesoft.com/apikit/4.x/apikit-4-headers

• Question 55:

  A Mule application includes a subflow containing a Scatter.Gather scope. Within each log of the Scatter.Gatter. an HTTP connector calls a PUT endpoint to modify records in different upstream system. The subflow is called inside an Unit successful scope to retry if a transitory exception is raised.

  A technical spike is being performed to increase reliability of the Mule application.

  Which steps should be performed within the Mule flow above the ensure idempontent behavior?

  A. Change the PUT requests inside the Scatter-Gather to POST requests

  B. Ensure an error-handling flow performs corrective actions to roll back all changes if any leg of the Scatter-Gather fails

  C. Remove the Put requests from the Scatter-Getter and perform them sequentially

  D. None, the flow already exhibits idempotent behavior

  Correct Answer: B

  To ensure idempotent behavior within a Mule flow that contains a subflow with a Scatter-Gather scope, the developer should ensure an error-handling flow performs corrective actions to roll back all changes if any leg of the Scatter-Gather fails. Idempotency means that multiple identical requests have the same effect as a single request. Therefore, if one of the HTTP requests inside the Scatter-Gather fails, the error-handling flow should undo any changes made by other successful requests to ensure consistency and avoid partial updates. References: https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-concepthttps://docs.mulesoft.com/mule-runtime/4.3/error-handling

• Question 56:

  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. If the two APIs use the same domain, the VM Connector can be leveraged

  B. The VM Connector is used to inter-application communication, so it is not possible to use the VM Connector

  C. Instead of using the VM Connector use directly

  D. 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

  Correct Answer: A

  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

• Question 57:

  Refer to the exhibit.

  A Mute Object Store is configured with an entry TTL of one second and an expiration interval of 30 seconds.

  What is the result of the flow if processing between os'store and os:retrieve takes 10 seconds?

  

  A. nullPayload

  B. originalPayload

  C. OS:KEY_NOT_FOUND

  D. testPayload

  Correct Answer: A

  The result of the flow is nullPayload if processing between os:store and os:retrieve takes 10 seconds. This is because the entry TTL of the object store is one second, which means that any stored value expires after one second and is removed from the object store. The expiration interval of 30 seconds only determines how often the object store checks for expired values, but it does not affect the TTL. Therefore, when os:retrieve tries to get the value after 10 seconds, it returns nullPayload because the value has already expired and been removed. References:https://docs.mulesoft.com/object-store/osv2-faq#how-does-the-time-to-live-work

• Question 58:

  A system API that communicates to an underlying MySQL database is deploying to CloudHub. The DevOps team requires a readiness endpoint to monitor all system APIs.

  Which strategy should be used to implement this endpoint?

  A. Create a dedicated endpoint that responds with the API status and reachability of the underlying systems

  B. Create a dedicated endpoint that responds with the API status and health of the server

  C. Use an existing resource endpoint of the API

  D. Create a dedicated endpoint that responds with the API status only

  Correct Answer: A

  To implement a readiness endpoint to monitor all system APIs, the developer should create a dedicated endpoint that responds with the API status and reachability of the underlying systems. This way, the DevOps team can check if the system API is ready to receive requests and if it can communicate with its backend systems without errors. References:https://docs.mulesoft.com/mule-runtime/4.3/deployment-strategies#readiness-probes

• Question 59:

  A custom policy needs to be developed to intercept all cutbound HTTP requests made by Mule applications.

  Which XML element must be used to intercept outbound HTTP requests?

  A. It is not possible to intercept outgoing HTTP requests, only inbound requests

  B. http-policy:source

  C. htt-policy:operation

  D. http-policy:processor

  Correct Answer: D

  The http-policy:processor element is used to intercept outbound HTTP requests made by Mule applications. It allows customizing the request before it is sent to the target API and modifying the response after it is received from the target API. References:https://docs.mulesoft.com/api-manager/2.x/policy-mule4-custom-policy#policy-xml-file

• Question 60:

  Which statement is true when using XML SDK for creating custom message processors?

  A. Properties are fields defined by an end user of the XML SDK component and serve as a global configuration for the entire Mule project in which they are used

  B. An XML SDK provides both inbound and outbound operations

  C. Operations can be reused in recursive calls

  D. All operations are public

  Correct Answer: D

  When using XML SDK for creating custom message processors, all operations are public by default and can be used by any Mule application that imports them. There is no way to make an operation private or protected in XML SDK. References:https://docs.mulesoft.com/mule-sdk/1.1/xml-sdk#operations