WSO2 WSO2-Certified-Enterprise-Integrator-6.5-Developer Questions & Answers

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Certified Enterprise Integrator 6.5 Developer

WSO2 Certified Enterprise Integrator 6.5 Developer

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Which of the following components in WSO2 EI is responsible for managing API traffic?

A. Proxy Service

C. Message Store

D. Integration Flow Answer: B

Explanation: The API Gateway is responsible for managing API traffic, including traffic routing, security, and analytics, making it a key component in API management.

Question: 559

When defining a custom mediator, which method is essential for processing the mediation logic?

D. run() Answer: B

Explanation: The process() method is essential in a custom mediator as it contains the

Question: 558

logic for processing the mediation flow.

Question: 560

You are developing an integration solution that requires complex data transformation rules based on business logic. Which approach would be most effective?

Use a Script mediator for dynamic transformations.
Implement a Class mediator with transformation logic.
Apply an XSLT mediator for static transformations.
Use a JSON to XML mediator. Answer: B

Question: 561

Identify the INCORRECT statement regarding WSO2 EI's support for different environments.

A. WSO2 EI can be deployed on both on-premises and cloud environments.

B. WSO2 EI does not support hybrid deployment models.

C. WSO2 EI can be configured for high availability.

D. WSO2 EI supports containerization for microservices. Answer: B

Explanation: WSO2 EI supports various deployment models, including hybrid deployment, making statement B incorrect.

Question: 562

Which of the following statements about custom class mediators is INCORRECT?

A. Custom class mediators can be tested using JUnit.

B. Class mediators can contain business logic beyond message routing.

C. Custom class mediators can interact with different message formats.

D. Class mediators can only be deployed in a single environment.

Explanation: Implementing a Class mediator allows for encapsulating complex business transformation logic, providing better control and maintainability compared to other options.

Explanation: Custom class mediators can be deployed in multiple environments, not limited to a single one, allowing for broader deployment strategies.

Question: 563

Which of the following statement about WSO2 EI's "event stream" is TRUE?

Event streams can be created only from database sources.
Event streams allow for real-time data processing.
Event streams are only available for batch processing scenarios.
Event streams cannot be used with message brokers. Answer: B

enabling event-driven architectures.

Question: 564

In a scenario where a WSO2 EI developer needs to ensure that messages are processed in a specific order, which mediator is MOST appropriate?

A. 'Aggregator' mediator

B. 'Sequence' mediator

C. 'Scatter-Gather' mediator

D. 'Call' mediator Answer: B

Explanation: The 'Sequence' mediator allows messages to be processed in a defined order, ensuring that each step is executed sequentially.

Question: 565

Which of the following best describes the purpose of a custom Class mediator in the ESB?

A. To provide standard logging for all messages

B. To manage API security settings

C. To execute specific business logic during message processing

Explanation: Event streams in WSO2 EI are designed for real-time data processing,

D. To handle message transformation Answer: C

Explanation: A custom Class mediator allows developers to introduce specific business logic during the message processing flow.

Question: 566

For improving the performance of an ESB server, which parameter would be most effective to configure in the JVM settings regarding thread management?

Using only XSLT for XML-to-XML transformations.
Relying solely on the database for data transformation.
Utilizing the PayloadFactory mediator to change message structure.
Ignoring data validation during transformation. Answer: C

Explanation: The PayloadFactory mediator allows for flexible data transformation by changing the message structure, accommodating various formats.

Question: 569

In a scenario where a developer needs to handle various message formats, which mediator provides the most flexibility?

B. 'Log' mediator

C. 'Message Filter' mediator

D. 'DataMapper' mediator Answer: D

Explanation: The 'DataMapper' mediator allows for complex transformations and supports multiple message formats, offering significant flexibility in handling different data types.

Question: 570

Consider the following property setting in a class mediator:

What does this configuration imply?

A. The property 'messageType' will always return 'type'.

B. The property 'messageType' is static and cannot be changed.

C. The value of 'messageType' is dynamically fetched from the message context.

D. This configuration is invalid and will cause an error.

A. 'PayloadFactory' mediator

Explanation: The configuration dynamically fetches the value of 'messageType' from the message context, allowing for adaptability in processing.

Question: 571

What is the primary function of the 'Filter' mediator in WSO2 EI?

To transform message formats.
To log the contents of messages for debugging.
To aggregate multiple message responses.
To route messages based on specific criteria. Answer: D

Question: 572

For optimizing thread management in a WSO2 ESB server, which JVM setting is crucial?

A. -XX:ParallelGCThreads

B. -XX:MaxInlineLevel

C. -XX:ThreadStackSize

D. -Xss Answer: A

Explanation: The -XX:ParallelGCThreads setting controls the number of threads used for parallel garbage collection, which can affect the overall performance of multi-threaded applications like WSO2 ESB.

Question: 573

What is the primary purpose of the 'Service Callout' mediator in an integration flow?

A. To call multiple services concurrently.

B. To invoke an external service and wait for a response.

C. To log service call details for auditing purposes.

D. To transform response formats between XML and JSON.

Explanation: The 'Filter' mediator is utilized to route messages based on specified conditions, allowing for selective processing.

Explanation: The 'Service Callout' mediator is used to invoke an external service synchronously and wait for its response, allowing for seamless integration.

Question: 574

What is the primary purpose of the "Rule" element in an XACML policy?

To specify the conditions under which access is granted or denied.
To define the policies that are applicable to a resource.
To list the obligations associated with a policy decision.
To indicate the policy's compliance with external standards. Answer: A

Question: 575

Which component is essential for implementing a publish-subscribe messaging pattern in WSO2 EI?

A. Message Store

C. Proxy Service

D. API Manager Answer: B

Explanation: JMS Topics are essential for implementing a publish-subscribe pattern, allowing multiple subscribers to receive messages published to a single topic.

Question: 576

Which of the following is NOT a valid configuration for the element in ?

instanceId sharedRegistry false

Explanation: The "Rule" element specifies the conditions that determine whether access should be granted or denied, operating within the context of the policy.

/ instanceCache

customRegistry
localRegistry
sharedRegistry
externalRegistry

Explanation: The must refer to predefined configurations; "customRegistry" is not a standard option.

Question: 577

Which WSO2 EI component is responsible for managing user roles and permissions?

C. Identity Server

D. Data Services Server Answer: C

Explanation: The Identity Server is responsible for managing user roles and permissions within WSO2 EI.

Question: 578

Identify the correct error description and solution for the following error message: => ERROR - org.apache.axis2.AxisFault: Invalid SOAP message received.

A. This error suggests a mismatch between the expected and received SOAP versions. Solution: Ensure the SOAP version in the request matches the service definition.

B. The error indicates that the SOAP message is not well-formed. Solution: Validate the SOAP message against XML standards.

C. The error arises when the SOAP envelope is missing. Solution: Include a properly formatted SOAP envelope in the message.

D. The error is due to a problem with the SOAPAction header. Solution: Correct the SOAPAction header to match the service requirements.

Explanation: An "Invalid SOAP message received" error commonly means that the structure of the SOAP message is incorrect, making it necessary to validate the message format.

Question: 579

Which of the following statements about the WSO2 EI's registry is FALSE?

The registry can only be accessed through the Management Console.
The registry supports versioning for stored artifacts.
The registry can store configuration artifacts and resources.
The registry allows for both a file-based and a database-based storage option. Answer: A

Question: 580

In a situation where the Callout Mediator is configured to handle timeouts, which of the following options would best describe the behavior when a timeout occurs during an API call?

A. The Callout Mediator will automatically retry the request until successful.

B. A timeout will cause the mediator to terminate processing without any error.

C. The Callout Mediator will return a predefined error response to the message flow.

D. The timeout behavior must be explicitly defined in the configuration for it to take effect.

Explanation: When a timeout occurs during an API call, the Callout Mediator can be configured to return a predefined error response, allowing for error handling in the message flow.

Question: 581

Which of the following network-related OS-level settings is critical for ensuring reliable message delivery in WSO2 ESB?

A. I/O scheduler type

Explanation: The WSO2 EI's registry can be accessed programmatically via APIs, not just through the Management Console.

Network interface bonding
TCP retransmission timeout Answer: D

Explanation: Adjusting the TCP retransmission timeout helps ensure that lost packets are retransmitted promptly, which is crucial for reliable message delivery in ESB applications.

Question: 582

Which of the following statements about WSO2 EI's integration with databases is TRUE?

WSO2 EI can only read data from databases, not write.
It supports complex queries using SQL.
Database integration is limited to only one database type.

Answer: B

Explanation: WSO2 EI supports complex SQL queries, enabling robust integration with various databases for both reading and writing data.

Question: 583

Identify the INCORRECT statement about the message transformation capabilities in WSO2 EI.

A. WSO2 EI supports XSLT for XML transformations.
B. WSO2 EI requires additional plugins for CSV transformation.
C. WSO2 EI can convert JSON to XML and vice versa.
D. WSO2 EI can handle complex data format transformations. Answer: B
Explanation: WSO2 EI does not require additional plugins for basic CSV transformation capabilities, making statement C incorrect.

Question: 584

In an XACML response, what does the "Decision" attribute indicate?
WSO2 EI does not support transactions with databases.

The final authorization decision made by the PDP.
The types of resources the policy applies to.
The attributes that must be returned to the requester.
The obligations that must be fulfilled after a decision is made.

Explanation: The "Decision" attribute indicates the final authorization decision made by the Policy Decision Point (PDP) based on the evaluated policies.

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