[2024年03月最新リリース] 合格できるMCD-Level-2試験にはリアル問題とアンサー
合格できるMCD-Level-2レビューガイド、頼もしいMCD-Level-2テストエンジン
質問 # 13
A Mule API receives a JSON payload and updates the target system with the payload. The developer uses JSON schemas to ensure the data is valid.
How can the data be validation before posting to the target system?
- A. Add the JSON module dependency and add the validate-schema operation in the flow, configured to reference the schema
- B. Using the DataWeave if Else condition test the values of the payload against the examples included in the schema
- C. Apply the JSON Schema policy in API Manager and reference the correct schema in the policy configuration
- D. Use a DataWeave 2.09 transform operation, and at the log of the DataWeave script, add:
%dw 2.0
Import.json-moduls
正解：A
解説：
Explanation
To validate the data before posting to the target system, the developer should add the JSON module dependency and add the validate-schema operation in the flow, configured to reference the schema. The JSON module provides a validate-schema operation that validates a JSON payload against a JSON schema and throws an error if the payload is invalid. References:
https://docs.mulesoft.com/json-module/1.1/json-validate-schema
質問 # 14
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. p{secure::tiskeystore,keyPassowrd}
- B. ${secure::tiskeystore,keyPassowrd}
- C. ${secure::tiskeystore,keyPassowrd}
- D. #{secure::tiskeystore,keyPassowrd}
正解：B
解説：
Explanation
secure::tiskeystore,keyPassowrdShortExplanationofCorrectAnswerOnly:Toreferenceasecurepropertyvaluewithin 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
質問 # 15
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
正解：B
解説：
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
質問 # 16
A Mule application contain two policies Policy A and Policy A has order1, and Policy B has order 2. Policy A Policy B, and a flow are defined by he configuration below.
When a HTTP request arrives at the Mule application's endpoint, what will be the execution order?
- A. A1, B1, F1, B2, A2
- B. B1, A1, F1, A2, B2
- C. F1, B1, A1, A2, B2
- D. F1, A1, B1, B2, A2
正解：A
解説：
Explanation
Based on the configuration below, when a HTTP request arrives at the Mule application's endpoint, the execution order will be A1, B1, F1, B2, A2. This is because policies are executed before and after the API implementation flow according to their order attribute. Policy A has order 1, which means it is executed first before Policy B, which has order 2. The flow is executed after both policies are executed before the flow.
Then, Policy B is executed after the flow before Policy A is executed after the flow. References:
https://docs.mulesoft.com/api-manager/2.x/policies-policy-order
質問 # 17
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 persistent queues, the message will be processed after the system comes online
- B. For transient queues, the message will be processed after the system comes online
- C. For nay type of queue, the message will be processed after the system comes online
- D. For any type of queue, the message will be lost
正解：A
解説：
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
質問 # 18
Which statement is true when working with correlation IDS?
- A. The HTTP Listener generates correlation IDS unless a correlation ID is received in the HTTP request
- B. The HTTP Listener regenerates correlation IDs regardless of the HTTP request
- C. The VM Connector does not automatically propagate correction IDs
- D. The Anypoint MQ Connector automatically propagates correlation IDS
正解：A
解説：
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
質問 # 19
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. Use the Tracing module to set logging variables with a Mapped Diagnostic Context
- C. Create a custom XML SDK component to wrap the logger processor and automatically add the order ID within the connector
- D. Set a flow variable and edit the log4/2.xml file to output the variable as part of the message pattern
正解：B
解説：
Explanation
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
質問 # 20
Which pattern can a web API use to notify its client of state changes as soon as they occur?
- A. Schedule Event Publisher
- B. Shared database trigger
- C. ETL data load
- D. HTTP Webhock
正解：D
解説：
Explanation
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
質問 # 21
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.
正解：B
解説：
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
質問 # 22
A Mule application deployed to multiple Cloudhub 2.0 replicas needs to temporarily persist large files over
10MB between flow executions, and routinely needs to query whether the file data exists on separate executions.
How can this be achieved?
- A. Store the key and full contents of the file in an Object Store
- B. Store the contents of the file on separate storage, and store the key and location of the file Object using Object Store v2
- C. Use an in-memory Object Store
- D. Store the key and full contents of the file, caching the filename and location between requests
正解：B
解説：
Explanation
To temporarily persist large files over 10MB between flow executions, and routinely query whether the file data exists on separate executions, the developer should store the contents of the file on separate storage, and store the key and location of the file object using Object Store v2. This way, the developer can avoid storing large files in memory or exceeding the size limit of Object Store v2 (10MB per object). The developer can also use Object Store v2 operations to query, retrieve, or delete the file object by its key. References:
https://docs.mulesoft.com/object-store/osv2-faq#can-i-store-files-in-object-store-v2
質問 # 23
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 Anypoint Studio, generate scaffolding from the RAML, and the modify the <http:listerner> in the generated flows to include a parameter to replace the version number
- B. In Design Center, open the RAML and modify baseUn to include a variable that indicates the version number
- C. In Design Center, open the RAML and modify each operation to include the major 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
正解：B
解説：
Explanation
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
質問 # 24
Refer to the exhibit.
What is the result of the Mule Maven Plugin configuration of the value of property its,keystorePassoword in CloudHub 2.0?
- A. Runtime Manager masks the value
- B. CloudHub encrypts the value
- C. Anypoint Studio secures the value
- D. The Mule server encrypts the value
正解：A
解説：
Explanation
The result of the Mule Maven Plugin configuration of the value of property its,keystorePassword in CloudHub
2.0 is that Runtime Manager masks the value. This means that Runtime Manager hides or obscures the value from anyone who views it in Runtime Manager or Anypoint Platform. References:
https://docs.mulesoft.com/runtime-manager/runtime-manager-agent-for-mule4#properties-tab
質問 # 25
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:processor
- C. htt-policy:operation
- D. http-policy:source
正解：B
解説：
Explanation
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
質問 # 26
Refer to the exhibit.
What is the result if ''Insecure'' selected as part of the HTTP Listener configuration?
- A. Mutual TLS authentication will be enabled between this HTTP Listener and an HTTP client
- B. The HTTP Lister will accept any unauthenticated request
- C. The HTTP listener will only accept HTTP requests
- D. The HTTP Listener will trust any certificate presented by the HTTP client
正解：C
解説：
Explanation
Based on the exhibit below, if 'Insecure' is selected as part of the HTTP Listener configuration, the HTTP listener will only accept HTTP requests. This means that no TLS context will be configured for this listener and no encryption or authentication will be applied to incoming requests. The protocol attribute of this listener will be set to HTTP instead of HTTPS. References:
https://docs.mulesoft.com/http-connector/1.6/http-listener-ref#insecure
質問 # 27
Which command is used to convert a JKS keystore to PKCS12?
- A. Keytool-importkeystore -srckeystore keystore jks-srcstoretype PKCS12 -destkeystore keystore.p12
-deststoretype JKS - B. Keytool-importkeystore -srckeystore keystore p12-srcstoretype PKCS12 -destkeystore keystore.jks
-deststoretype JKS - C. Keytool-importkeystore -srckeystore keystore jks-srcstoretype JKS -destkeystore keystore.p13
-deststoretype PKCS12 - D. Keytool-importkeystore -srckeystore keystore p12-srcstoretype JKS -destkeystore keystore.p12
-deststoretype PKCS12
正解：D
解説：
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-AE75-6D182625954
質問 # 28
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 daman project.
Create a common-global-error-handler flow inside the domain project.
Use this domain project as a dependency. - 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 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.
正解：C
解説：
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
質問 # 29
Which statement is true about using mutual TLS to secure an application?
- A. Mutual TLS ensures only authorized end users are allowed to access an endpoint
- B. Mutual TLS requires a hardware security module to be used
- C. Mutual TLS authenticates the identity of the server before the identity of the client
- D. Mutual TLS increases the encryption strength versus server-side TLS alone
正解：C
解説：
Explanation
Mutual TLS (mTLS) is an extension of TLS that requires both parties (client and server) to present their certificates to each other during the handshake process. This way, both parties can verify each other's identity and establish a secure connection. The authentication of the server happens before the authentication of the client, as the server sends its certificate first and then requests the client's certificate. References:
https://docs.mulesoft.com/mule-runtime/4.3/tls-configuration#mutual-authentication
質問 # 30
A heathcare customer wants to use hospital system data, which includes code that was developed using legacy tools and methods. The customer has created reusable Java libraries in order to read the data from the system.
What is the most effective way to develop an API retrieve the data from the hospital system?
- A. Include the libraries writes deploying the code into the runtime
- B. Install libraries in a local repository and refer to it in the pm.xml file
- C. Create the Java code in your project and invoice the data from the code
- D. Refer to JAR files in the code
正解：B
解説：
Explanation
To develop an API that retrieves data from a hospital system using reusable Java libraries, the developer should install libraries in a local repository and refer to it in the pom.xml file. This way, the developer can use Maven to manage dependencies and invoke Java code from Mule applications using Java Module operations.
References:
https://docs.mulesoft.com/mule-runtime/4.3/java-module-reference#add-the-java-module-to-your-project
https://docs.mulesoft.com/mule-runtime/4.3/java-module-reference#invoke-java-code
質問 # 31
Which pattern should be used to invoke multiple HTTP APIs in parallel and roll back failed requests in sequence?
- A. A Parallel for Each scope with each HTTP request wrapped in a Try scope
- B. A database as a transactional outbox and an Until Successful router to retry any requests
- 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
正解：C
解説：
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
質問 # 32
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. Add a Maven dependency in the POM file with jar as <classifier>
- 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. Download the common application from Naxus and copy it to the src/main/resources folder in the API
正解：A
解説：
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
質問 # 33
A developer deploys an API to CloudHub and applies an OAuth policy on API Manager. During testing, the API response is slow, so the developer reconfigures the API so that the out-of-the-box HTTP Caching policy is applied first, and the OAuth API policy is applied second.
What will happen when an HTTP request is received?
- A. In case of a cache miss, both the OAuth and HTTP Caching policies are evaluated; then the API retrieves the data from the API implementation, and the policy does not store the data in Object Store
- B. In case of a cache it, only the HTTP Caching policy is evaluating; then the cached response is returned to the caller
- C. In case of a cache hit, both the OAuth and HTTP Caching policies are evaluated; then the cached response is returned to the caller
- D. In case of a cache miss, only the HTTP Caching policy is evaluated; then the API retrieves the data from the API implementation, and the policy stores the data to be cached in Object Store
正解：B
解説：
Explanation
When an HTTP request is received and the HTTP Caching policy is applied first, it checks if there is a cached response for that request in Object Store. If there is a cache hit, meaning that a valid cached response exists, then only the HTTP Caching policy is evaluated and the cached response is returned to the caller without invoking the OAuth policy or the API implementation. If there is a cache miss, meaning that no valid cached response exists, then both the HTTP Caching policy and the OAuth policy are evaluated before invoking the API implementation. References:
https://docs.mulesoft.com/api-manager/2.x/http-caching-policy#policy-ordering
質問 # 34
What is the MuleSoft recommended method to encrypt sensitive property data?
- A. The encryption key should be identical for all environments and the sensitive data should be different for each environment
- B. The encryption key should be identical for all environments
- C. The encryption key should be different for each environment and the sensitive data should be the same for all environments
- D. The encryption key and sensitive data should be different for each environment
正解：D
解説：
Explanation
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
質問 # 35
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