Question # 1
An organization uses CloudHub to deploy all of its applications. How can a common-global-handler flow be configured so that it can be reused across all of the organization’s deployed applications? |
A. Create a Mule plugin project Create a common-global-error-handler flow inside the plugin project. Use this plugin as a dependency in all Mute applications. Import that configuration file in Mute applications. | B. Create a common-global-error-handler flow in all Mule Applications Refer to it flow-ref wherever needed. | C. Create a Mule Plugin project Create a common-global-error-handler flow inside the plugin project. Use this plugin as a dependency in all Mule applications | D. Create a Mule daman project. Create a common-global-error-handler flow inside the domain project. Use this domain project as a dependency. |
C.
Create a Mule Plugin project Create a common-global-error-handler flow inside the plugin project. Use this plugin as a dependency in all Mule applications
Explanation: To configure a common-global-handler flow that can be reused across all of the organization’s deployed applications, the developer should create a Mule Plugin project, create a common-global-error-handler flow inside the plugin project, and use this plugin as a dependency in all Mule applications. This way, the developer can import the common-global-error-handler flow in any application that needs it and avoid duplicating the error handling logic.
References: https://docs.mulesoft.com/mule-runtime/4.3/error-handling#global-error-handler
Question # 2
A Mule application deployed to a standardalone Mule runtime uses VM queues to publish messages to be consumed asynchronously by another flow. In the case of a system failure, what will happen to in-flight messages in the VM queues that have been consumed? |
A. For nay type of queue, the message will be processed after the system comes online | B. For persistent queues, the message will be processed after the system comes online | C. For transient queues, the message will be processed after the system comes online | D. For any type of queue, the message will be lost |
B.
For persistent queues, the message will be processed after the system comes online
Explanation: In case of a system failure, in-flight messages in persistent VM queues that have been consumed will be processed after the system comes online. This is because persistent VM queues store messages on disk and guarantee delivery even if there is a system crash or restart. Therefore, any in-flight messages that have been consumed but not processed will be recovered from disk and processed when the system is back online.
References: https://docs.mulesoft.com/mule-runtime/4.3/vm-connector#persistent-queues
Question # 3
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 |
D.
All operations are public
Explanation: 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
Question # 4
A Mule implementation uses a HTTP Request within an Unit Successful scope to connect to an API. How should a permanent error response like HTTP:UNAUTHORIZED be handle inside Until Successful to reduce latency? |
A. Configure retrying until a MULERETRY_EXHAUSTED error is raised or the API responds back with a successful response. | B. In Until Successful configuration, set the retry count to 1 for error type HTTP: UNAUTHORIZED. | C. Put the HTTP Request inside a try scope in Unit Successful. In the error handler, use On Error Continue to catch permanent errors like HTTP UNAUTHORIZED. | D. Put the HTTP Request inside a try scope in Unit Successful. In the error handler, use On Error Propagate to catch permanent errors like HTTP UNAUTHORIZED. |
C.
Put the HTTP Request inside a try scope in Unit Successful. In the error handler, use On Error Continue to catch permanent errors like HTTP UNAUTHORIZED.
Explanation: To handle a permanent error response like HTTP:UNAUTHORIZED inside Until Successful, the developer should put the HTTP Request inside a try scope in Unit Successful, and use On Error Continue to catch permanent errors like HTTP UNAUTHORIZED in the error handler. This way, the developer can avoid retrying requests that will always fail due to a permanent error, and reduce latency. On Error Continue allows the flow to continue processing after handling the error.
References: https://docs.mulesoft.com/mule-runtime/4.3/until-successful-scope https://docs.mulesoft.com/mule-runtime/4.3/on-error-continue-concept
Question # 5
Which type of cache invalidation does the Cache scope support without having to write any additional code? |
A. Write-through invalidation | B. White-behind invalidation | C. Time to live | D. Notification-based invalidation |
The Cache scope supports time to live (TTL) as a cache invalidation strategy without having to write any additional code. TTL specifies how long the cached response is valid before it expires and needs to be refreshed. The Cache scope also supports custom invalidation strategies using MEL or DataWeave expressions.
References: https://docs.mulesoft.com/mule-runtime/4.3/cache-scope#cache_invalidation
Question # 6
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 |
C.
The HTTP Listener generates correlation IDS unless a correlation ID is received in the HTTP request
Explanation: 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 # 7
Which command is used to convert a JKS keystore to PKCS12? |
A. Keytool-importkeystore –srckeystore keystore p12-srcstoretype PKCS12 –destkeystore keystore.jks–deststoretype JKS | B. Keytool-importkeystore –srckeystore keystore p12-srcstoretype JKS –destkeystore keystore.p12–deststoretype PKCS12 | C. Keytool-importkeystore –srckeystore keystore jks-srcstoretype JKS –destkeystore keystore.p13–deststoretype PKCS12 | D. Keytool-importkeystore –srckeystore keystore jks-srcstoretype PKCS12 –destkeystore keystore.p12–deststoretype JKS |
B.
Keytool-importkeystore –srckeystore keystore p12-srcstoretype JKS –destkeystore keystore.p12–deststoretype PKCS12
Explanation: To convert a JKS keystore to PKCS12, the developer needs to use the keytool-importkeystore command with the following options: -srckeystore keystore.jks -srcstoretype JKS -destkeystore keystore.p12 -deststoretype PKCS12. This command imports all entries from a source JKS keystore (keystore.jks) into a destination PKCS12 keystore (keystore.p12).
References: https://docs.oracle.com/en/java/javase/11/tools/keytool.html#GUID-5990A2E4-78E3-47B7-AE75-6D1826259549
Question # 8
When implementing a synchronous API where the event source is an HTTP Listener, a developer needs to return the same correlation ID back to the caller in the HTTP response header. How can this be achieved? |
A. Enable the auto-generate CorrelationID option when scaffolding the flow | B. Enable the CorrelationID checkbox in the HTTP Listener configuration | C. Configure a custom correlation policy | D. NO action is needed as the correlation ID is returned to the caller in the response header by default |
D.
NO action is needed as the correlation ID is returned to the caller in the response header by default
Explanation: When implementing a synchronous API where the event source is an HTTP Listener, Mule automatically propagates some message attributes between flows via outbound and inbound properties. One of these attributes is correlation ID, which is returned to the caller in the response header by default as MULE_CORRELATION_ID.
References: https://docs.mulesoft.com/mule-runtime/4.3/about-mule-message#message-attributes
Question # 9
The Center for Enablement team published a common application as a reusable module to the central Nexus repository. How can the common application be included in all API implementations? |
A. Download the common application from Naxus and copy it to the src/main/resources folder in the API | B. Copy the common application’s source XML file and out it in a new flow file in the src/main/mule folder | C. Add a Maven dependency in the PCM file with multiple-plugin as <classifier> | D. Add a Maven dependency in the POM file with jar as <classifier> |
D.
Add a Maven dependency in the POM file with jar as <classifier>
Explanation: To include a common application as a reusable module in all API implementations, the developer should add a Maven dependency in the POM file with jar as <classifier>. This way, the developer can reuse Mule code from another application by packaging it as a JAR file and adding it as a dependency in the POM file of the API implementation. The classifier element specifies that it is a JAR file.
References: https://docs.mulesoft.com/mule-runtime/4.3/mmp-concept#add-a-maven-dependency-to-the-pom-file
Question # 10
A Mule application defines as SSL/TLS keystore properly ‘tis,keystore.keyPassword’’ as secure. How can this 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} |
B.
${secure::tiskeystore,keyPassowrd}
Explanation: secure::tiskeystore,keyPassowrdShortExplanationofCorrectAnswerOnly:Toreferenceasecurepropertyvaluewithintheapplication,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
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