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Microsoft TS: Windows Communication Foundation velopment with Microsoft .NET Framework 4 Sample Questions:

1. You need to modify a client application that consumes a Windows Communication Foundation (WCF) service.
The service metadata is no longer available.
You need to modify the previously generated proxy to include asynchronous calls to the service.
What should you do?

A) Create a class with the same name as the previously generated proxy and add the new asynchronous methods as partial methods. Add the new class to a namespace that is different from the original proxy.
B) Update the service reference with the Generate asynchronous operations option.
C) Create a partial class for the previously generated proxy and include the new asynchronous methods.
D) Create a class with the same name as the previously generated proxy and add the new asynchronous methods. Add the new class to a namespace that is different from the original proxy.

2. You develop a Windows Communication Foundation (WCF) service that uses basic authentication for client credentials. This service is currently configured to use message security.
The service is hosted on a server in workgroup mode.
Users report that their passwords are stolen when they use public computers. You need to ensure that messages are secure and users are authenticated.
You prevent the service from being called over HTTP through Microsoft Internet Information Services (IIS) configuration.
What should you do next?

A) Use the message security mode and specify Basic for the transport client credential type.
B) Use the transport security mode and specify None for transport client credential type.
C) Use the transportWithMessageCredential security mode and specify Basic for the transport client credential type.
D) Use the transportWithMessageCredential security mode and specify None for the transport client credential type.

3. You are developing a Windows Communication Foundation (WCF) service that executes a long-running operation.
The service is accessed from your business applications in a server transaction in which the client does not participate.
You need to ensure that the transaction times out and aborts if the operation has not completed within 45 seconds.
What should you do?

A) Apply f ServiceBehavior (TransaccionTlmeout="00:00:45")] to the service implementation.
B) Set the service binding sendTimeout attribute to 00:00:45.
C) Set the service binding receiveTimeout attribute to 00:00:45.
D) Apply [OperationBehavior (TransaccionScopeRequired=false)] to the service operation.

4. You are creating a Windows Communication Foundation (WCF) service that responds using plain-old XML (POX).
You have the following requirements:
- You must enable the /catalog.svc/items operation to respond using the POX, JSON, or ATOM formats. You also must ensure that the same URL is used regardless of the result type.
- You must determine the response format by using the Accepts HTTP header.
What should you do?

A) Set the return type of the operation to System.ServiceModel.Channels.Message. Use the current WebOperationContext methods to return the data in the required format.
B) Set the BodyStyle parameter of the WebGet attribute on the operation to WebMessageBodyStyle.WrappedResponse.
C) Implement the System.Runtime.Serialization.IFormatterConverter interface in the service class.
D) Implement the IChannelInitializer interface in the service class.

5. You develop a Windows Communication Foundation (WCF) service that contains the following code segment. (Line numbers are included for reference only.)

You need to ensure that all service endpoints are available to client applications. Which code segment should you insert at line 04?

A) Option A
B) Option B
C) Option D
D) Option C

Solutions: