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MuleSoft MCD-Level-2 Sample Question Answers
Question # 1
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
Answer: C
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.
Reference: https://docs.mulesoft.com/mule-runtime.3/about-mule-message#message-attributes
Question # 2
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
Answer: C
Explanation:
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. Reference:
https://docs.mulesoft.com/mule-sdk.1/xml-sdk#testing
Question # 3
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
Answer: D
Explanation:
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. Reference:
https://docs.mulesoft.com/mule-runtime.3/http-listener-ref#callback
Question # 4
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
Answer: D
Explanation:
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. Reference:
https://docs.mulesoft.com/mule-runtime.3/http-listener-ref#callback
Question # 5
In a Mule project, Flow-1 contains a flow-ref to Flow-2 depends on data from Flow-1 to execute
successfully.
Which action ensures the test suites and test cases written for Flow-1 and Flow-2 will execute
successfully?
A. Chain together the test suites and test cases for Flow-1 and Flow-2 B. Use ˜Set Event to pass the input that is needed, and keep the test cases for Flow-1 and Flow-2 independent C. Use ˜Before Test Case To collect data from Flow-1 test cases before running Flow-2 test cases D. Use ˜After Test Case to produce the data needed from Flow-1 test cases to pass to Flow-2 test cases
Answer: B
Explanation:
To ensure the test suites and test cases written for Flow-1 and Flow-2 will execute successfully, the
developer should use a Set Event processor to pass the input that is needed by Flow-2, and keep the
test cases for Flow-1 and Flow-2 independent. This way, the developer can isolate the testing of each
flow and avoid coupling them together. Reference: https://docs.mulesoft.com/munit.3/munit-testflow
Question # 6
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}
Answer: B
Explanation:
secure::tiskeystore,keyPassowrd
∗∗
ShortExplanationofCorrectAnswerOnly:Toreferenceasecureproper
tyvaluewithintheapplication,thedeveloperneedstousethesyntax{secure::}. In this case, the property
name is tiskeystore,keyPassword, so the correct syntax is ${secure::tiskeystore,keyPassowrd}.
Reference: https://docs.mulesoft.com/mule-runtime.3/secure-configurationproperties#
referencing-secure-properties
Question # 7
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
Answer: A
Explanation:
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. Reference: https://docs.mulesoft.com/muleruntime/
4.3/deployment-strategies#readiness-probes
Question # 8
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 hit, both the OAuth and HTTP Caching policies are evaluated; then the cached
response is returned to the caller 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 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 D. 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
Answer: B
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. Reference:
https://docs.mulesoft.com/api-manager.x/http-caching-policy#policy-ordering
Question # 9
A healthcare portal needs to validate the token that it sends to a Mule API. The developer plans to
implement a custom policy using the HTTP Policy Transform Extension to match the token received in
the header from the heathcare portal.
Which files does the developer need to create in order to package the custom policy?
A. Deployable ZIP file, YAML configuration file B. JSON properties file, YAML configuration file C. JSON properties file, XML template file D. XML template file, YAML configuration file
Answer: D
Explanation:
To package a custom policy using the HTTP Policy Transform Extension, the developer needs to
create an XML template file and a YAML configuration file. The XML template file defines the policy
logic using Mule components and placeholders for user-defined properties. The YAML configuration
file defines the metadata of the policy, such as its name, description, category, parameters, and
dependencies. Reference: https://docs.mulesoft.com/api-manager.x/http-policytransform#
packaging-the-policy
Question # 10
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
Answer: A
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. Reference: https://docs.mulesoft.com/mule-runtime.3/secure-configurationproperties
Question # 11
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
Answer: C
Explanation:
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. Reference: https://docs.mulesoft.com/mule-runtime.3/cachescope#
cache_invalidation
Question # 12
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
Answer: D
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. Reference: https://docs.mulesoft.com/mule-sdk.1/xmlsdk#
operations
Question # 13
Which statement is true about using mutual TLS to secure an application?
A. Mutual TLS requires a hardware security module to be used B. Mutual TLS authenticates the identity of the server before the identity of the client C. Mutual TLS ensures only authorized end users are allowed to access an endpoint D. Mutual TLS increases the encryption strength versus server-side TLS alone
Answer: B
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
others 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 clients
certificate. Reference: https://docs.mulesoft.com/mule-runtime.3/tls-configuration#mutualauthentication
Question # 14
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
Answer: D
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. Reference: https://docs.mulesoft.com/muleruntime/
4.3/about-mule-message#message-attributes
Question # 15
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
Answer: D
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. Reference: https://docs.mulesoft.com/apimanager/
2.x/policy-mule4-custom-policy#policy-xml-file
Question # 16
When a client and server are exchanging messages during the mTLS handshake, what is being agreed
on during the cipher suite exchange?
A. A protocol B. The TLS version C. An encryption algorithm D. The Public key format
Answer: C
Explanation:
A cipher suite is a set of cryptographic algorithms that are used to secure the communication
between a client and a server. A cipher suite consists of four components: a key exchange algorithm,
an authentication algorithm, an encryption algorithm, and a message authentication code (MAC)
algorithm. During the cipher suite exchange, the client and the server agree on which encryption
algorithm to use for encrypting and decrypting the data. Reference:
https://docs.mulesoft.com/mule-runtime.3/tls-configuration#cipher-suites
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