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

1. You are creating an application using Visual Studio 2010. The application consumes a Windows Communication Foundation (WCF) service.
You are adding a service reference to the WCF service.
You need to ensure that the generated proxy does not block the calling thread when executing a service method.
What should you do when adding the service reference?

A) Select the Generate asynchronous operations option.
B) Set the Collection type to ObservableCollection.
C) Select the Always generate message contracts option.
D) Select the Reuse types in all referenced assemblies option.

2. You are configuring services to be discoverable. The services must be discoverable without relying on a central server. Client applications that consume the services are on a network segment that is separate from the network segment that the services are located on.
A firewall blocks all TCP ports between the two network segments, but allows other protocols to pass through.
You need to ensure that the client applications can discover the services.
What should you do?

A) Use managed discovery mode over UDP.
B) Use managed discovery mode over HTTP.
C) Use ad-hoc discovery mode over UDP.
D) Use ad-hoc discovery mode over HTTP.

3. You are creating a Windows Communication Foundation (WCF) service.
You have the following requirements:
Messages must be sent over TCP.
The service must support transactions.
Messages must be encoded using a binary encoding.
Messages must be secured using Windows stream-based security.
----
You need to implement a custom binding for the service.
In which order should the binding stack be configured?

A) transactionFlow binaryMessageEncoding windowsStreamSecurity tcpTransport
B) binaryMessageEncoding transactionFlow tcpTransport windowsStreamSecurity
C) tcpTransport windowsStreamSecurity transactionFlow binaryMessageEncoding
D) windowsStreamSecurity tcpTransport binaryMessageEncoding t ransactionFlow

4. You are implementing a Windows Communication Foundation (WCF) service contract named IContosoService in a class named ContosoService. The service occasionally fails due to an exception being thrown at the service.
You need to send the stack trace of any unhandled exceptions to clients as a fault message.
What should you do?

A) In the application configuration file on the service and all the clients, add the following
XML segment to the system.diagnostics/sources configuration section group.
<source name="System.ServiceModel" switchValue="Error" propagateActivity="true">
<listeners>
<add name="ServiceModelTraceListener"
initializeData="app_tracelog.svclog"
type="System.Diagnostics.XmlWriterTraceListener" />
</listeners>
</source>
B) In the application configuration file on the client, add the following XML segment to the
system.serviceModel/behaviors configuration section group.
<endpointBehaviors>
<behavior name=" debug ">
< callback Debug includeExceptionDetailInFaults="true" />
</behavior>
</endpointBehaviors>
Associate the debug behavior with any endpoints that need to return exception details.
C) For each OperationContract exposed by IContosoService, apply the following attribute.
[FaultContract(typeof(Exception))]
D) Apply the following attribute to the ContosoService class.
[ServiceBehavior(IncludeExceptionDetailInFaults = true)]

5. You are creating a Windows Communication Foundation (WCF) service that implements operations in a RESTful manner. You need to add a delete operation.
You implement the delete method as follows.
Sub DeleteItems (ByVol id As String)
You need to configure WCF to call this method when the client calls the service with the HTTP DELETE operation.
What should you do?

A) Add the WebInvoke(UriTemplate: = "/Items/{id>", Method: = "DELETE") attribute to the operation.
B) Replace the string parameter with a RemovedActivityAction parameter.
C) Add the HttpDelete attribute to the operation.
D) Change the Sub statement to Function and specify RemovedActivityAction as the return type.

Solutions: