MuleSoft mcd-level-1 practice test
MuleSoft Certified Developer - Level 1 (Mule 4)
Question 1
Refer to the exhibit.
What expression correctly specifies input parameters to pass the city and state values to the SQL
query?
A)
B)
C)
D)
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer:
A
Explanation:
MuleSoft Documentation Reference : https://docs.mulesoft.com/db-connector/1.9/database-
connector-select
Question 2
A Mule flow has three Set Variable transformers. What global data structure can be used to access
the variables?
- A. Mule event attributes
- B. Mule event message
- C. Mule application properties
- D. Mule event
Answer:
D
Explanation:
Mule event is correct answer. Mule event has two parts which are as follows
1) Message (which contains payload and attributes like headers and query/uri parameters
2) Variables
Question 3
In an application network. If the implementation but not the interface of a product API changes,
what needs to be done to the other APIs that consume the product API?
- A. The applications associated with the other APIs must be restarted
- B. The applications associated with the other APIs must be recoded
- C. The other APIs must be updated to consume the updated product API
- D. Nothing needs to be changed in the other APIs or their associated applications
Answer:
D
Explanation:
Correct answer is Nothing needs to be changed in the other APIs or their associated applications
This is the benefit of having separate interface layer. As there are no changes to interface , no
changes are required on the API's which consumes this API in context
Question 4
Refer to the exhibit.
What is the response to a web client request to
http://localhost:8081
?
- A. After
- B. before
- C. Validation Error
- D. null
Answer:
C
Explanation:
Question 5
Refer to the exhibits.
The two Mule configuration files belong to the same Mule project. Each HTTP Listener is configured
with the same host string and the port number, path, and operation values are shown in the display
names.
What is the minimum number of global elements that must be defined to support all these HTTP
Listeners?
- A. 1
- B. 2
- C. 3
- D. 4
Answer:
C
Explanation:
In this case three configurations will be required each for port 8000, 6000 and 7000.
There would be three global elements defined for HTTP connections.
Each HTTP connection will have host and port. One example shown below with host as localhost and
port 6000
To use an HTTP listener, you need to declare a configuration with a corresponding connection. This
declaration establishes the HTTP server that will listen to requests.
Additionally, you can configure a base path that applies to all listeners using the configuration.
<http:listener-config name="HTTP_Listener_config" basePath="api/v1">
<http:listener-connection host="0.0.0.0" port="8081" />
</http:listener-config>
https://docs.mulesoft.com/http-connector/1.6/http-listener-ref#http-listener-configuration
Question 6
Refer to the exhibits. What payload is logged at the end of the main flow?
- A. [order1, order2, order3, order4]
- B. [1, 2, 3, 4]
- C. order4
- D. order1order2order3order4
Answer:
B
Explanation:
For Each Scope
The For Each scope splits a payload into elements and processes them one by one through the
components that you place in the scope. It is similar to a for-each/for loop code block in most
programming languages and can process any collection, including lists and arrays. The collection can
be any supported content type, such as application/json, application/java, or application/xml.
General considerations about the For Each scope:
By default, For Each tries to split the payload. If the payload is a simple Java collection, the For Each
scope can split it without any configuration. The payload inside the For Each scope is each of the split
elements. Attributes within the original message are ignored because they are related to the entire
message.
For Each does not modify the current payload. The output payload is the same as the input.
Mule Doc Reference :
https://docs.mulesoft.com/mule-runtime/4.3/for-each-scope-concept
Question 7
Refer to the exhibit.
What is the correct DataWeave expression for the Set Payload transformer to call the
createCustomerObject flow with values for the first and last names of a new customer?
- A. lookupC createCustomerObJect( "Alice", "Green- ) )
- B. createCustomerObject( { first: "Alice", last: "Green" > )
- C. lookupf "createCustomerObject", { first: "Alice", last: "Green" > )
- D. createCustomerObject( "Alice", "Green")
Answer:
C
Explanation:
lookup(String, Any, Number)
This function enables you to execute a flow within a Mule app and retrieve the resulting payload.
It works in Mule apps that are running on Mule Runtime version 4.1.4 and later.
Similar to the Flow Reference component (recommended), the lookup function enables you to
execute another flow within your app and to retrieve the resulting payload. It takes the flow’s name
and an input payload as parameters. For example, lookup("anotherFlow", payload) executes a flow
named anotherFlow.
Correct answer is
lookup( "createCustomerObject", {first: "Aice, last: "Green"})
MuleSoft Documentation Reference : https://docs.mulesoft.com/mule-runtime/4.3/dw-mule-
functions-lookup
Question 8
What is the output type of the DataWeave map operator?
- A. String
- B. Array
- C. Map
- D. Object
Answer:
B
Question 9
Refer to the exhibits.
What is written to the records.csv file when the flow executes?
- A. The JSON payload
- B. An error message
- C. Nothing
- D. The payload convert to CVS
Answer:
A
Explanation:
Transform Message Add write_date is coverting payload in JSON format and same JSON payload is
avaialble to file write processor. However, if the payload is a different format (for example, not CSV) ,
you can place the transformation inside the Write operation to generate content that will be written
without producing a side effect on the message in transit. This is not done in this case. By default, the
connector writes whatever is in the message payload. Hence JSON payload will be written to file.
Question 10
Refer to the exhibit.
How many private flows does APIKIT generate from the RAML specification?
- A. 1
- B. 2
- C. 3
- D. 4
Answer:
D
Question 11
Refer to the exhibits.
The Validation component in the private flow throws an error. What response message is returned to
a client request to the main flow's HTTP Listener?
- A. Error - private flow
- B. Error - main flow
- C. Success - main flow
- D. Validation Error
Answer:
B
Explanation:
Error in validation component will get processed by Processer level On Error Propagate block and
then error will be rethrown which will get processed by flow level error handler which will set
payload to "Error- main flow". Hence correct answer is Error - main flow
1) Request is received by HTTP listener
2) Try scope gets executed
3) The validator component in the Try scope creates an Error Object because the payload is not null.
4) The On Error Propagate handles the error. The payload is set to “Error – Try scope”
6) “Error – Try scope” is returned to the 'On Error Continue' block. Main flow execution stops.
Payload is set to "Error - main flow"
7) “Error - main flow” is returned to the requestor in the body of the HTTP request. HTTP Status
Code: 200
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Reference Diagram though not exactly same, conditions are similar. They will help you answer any
new question on error handling in real exam:
https://docs.mulesoft.com/mule-runtime/4.3/on-error-scope-concept#on-error-continue
Question 12
Refer to the exhibit.
What should be changed to fix the 415 error?
- A. set the response Content-Type header to text/plain
- B. set the response Content-Type header to application/json
- C. Set the request Content-Type header to application/] son
- D. set the request Content-Type header to text/plain
Answer:
C
Explanation:
The HTTP 415 Unsupported Media Type client error response code indicates that the server refuses
to accept the request because the payload format is in an unsupported format. The format problem
might be due to the request's indicated Content-Type or Content-Encoding , or as a result of
inspecting the data directly. In this case as per RAML specification data is expected in
application/json and in request Content-Type is set as "text/plain" which is incorrect. Hence solution
is set the request Content-Type header to application/json
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/415
Question 13
Refer to the exhibit.
What is the output payload in the On Complete phase
- A. summary statistics with NO record data
- B. The records processed by the last batch step: [StepTwol, StepTwo2, StepTwo3]
- C. The records processed by all batch steps: [StepTwostepOnel, stepTwostepOne2, StepTwoStepOne3]
- D. The original payload: [1,2,31
Answer:
A
Explanation:
This is a trcik question. On complete phase pyalod consists of summary of records processed which
gives insight on which records failed or passed. Hence option 4 is correct answer
MuleSoft Documentation Reference : https://docs.mulesoft.com/mule-runtime/4.3/batch-
processing-concept#on-complete
Question 14
Refer to the exhibit.
The main flow is configured with their error handlers. A web client submit a request to the HTTP
Listener and the HTTP Request throws an HTTP:NOT_FOUND error.
What response message is returned?’’
What response message is returned?
- A. APP: API RESOURCE NOT FOUND
- B. HTTP: NOT FOUND
- C. other error
- D. success - main flow
Answer:
A
Explanation:
Correct answer is APP: API RESOURCE NOT FOUND
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1) A web client submits the request to the HTTP Listener.
2) The HTTP Request throws an "HTTP:NOT_FOUND" error, execution halts.
3) The On Error Propagate error Handler handles the error. In this case ,HTTP:NOT_FOUND error is
mapped to custom error APP:API_RESOURCE_NOT_FOUND. This error processor sets payload to
APP:API_RESOURCE_NOT_FOUND.
4) “APP:API_RESOURCE_NOT_FOUND. ” is the error message returned to the requestor in the body
of the HTTP request with HTTP Status Code: 500
Reference Diagram:
Question 15
What is the correct syntax for a Logger component to output a message with the contents of a 3SON
Object payload?
- A. The payload is: $(payload)
- B. #["The payload is: " ++ payload]
- C. The payload is: #[payload]
- D. #["The payload is: " + payload]
Answer:
B
Explanation:
Option 3 is the only corect answer as it concatenates payload with String.
Below option wont work.
#["The payload is " ++ payload]
Concatenation function expects both arguments to be string. As the question says payload is json
object , this will throw error while running it. You can try this in Anypoint Studio and you will get the
same result which I mentioned.
hence correct answer is
The payload is: #[payload]