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

1. You are developing a Windows Communication Foundation (WCF) service.
The service operation takes a customer number as the only argument and returns information about the customer. The service requires a security token in the header of the message.
You need to create a message contract for the service.
Which code segment should you use?

A) <ServiceContract()>
Public Interface IService
<OperationContract()>
Function GetCustomerInformation(
ByVal header As Header, ByVal customerNumber As Integer) As CustomerInformation End Interface <MessageContract()> Public Class CustomerInformation End Class <MessageContract()> Public Class Header <MessageHeader()> Public SecurityTag As String End Class
B) <ServiceContract()> Public Interface IService <OperationContract()> Function GetCustomerInformation( ByVal request As CustomerNumber) As CustomerInformation End Interface <MessageContract()> Public Class CustomerInformation End Class <MessageContract()> Public Class CustomerNumber <MessageHeader()> Public SecurityTag As String <MessageBodyMember()> Public CustomerNumberElement As Integer End Class
C) <ServiceContract()> Public Interface IService <OperationContract()> Function GetCustomerInformation( ByVal request As CustomerNumber) As CustomerInformation End Interface <DataContract()> Public Class CustomerInformation End Class <MessageContract()> Public Class CustomerNumber <MessageHeader()> Public SecurityTag As String <MessageBodyMember()> Public CustomerNumberElement As Integer End Class
D) <ServiceContract()>
Public Interface IService
<OperationContract()>
Function GetCustomerInformation(
ByVal header As Header,
ByVal customerNumber As Integer)
As CustomerInformation
End Interface
<DataContract()>
Public Class CustomerInformation
End Class
<MessageContract()>
Public Class Header
<MessageHeader()>
Public SecurityTag As String
End Class

2. You are developing an application to update a users social status. You need to consume the service using Windows Communication Foundation (WCF).
The client configuration is as follows.
<system.serviceModel>
<bindings>
<webHttpBinding>
<binding name="SocialConfig">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Basic"
realm="Social API" />
</security>
</binding>
</webHttpBinding>
</bindings>
<client>
<endpoint address="http://contoso.com"
binding="webHttpBinding"
bindingConfiguration="SocialConfig"
contract="ISocialStatus"
name="SocialClient" />
</client>
</system.serviceModel>
The service contract is defined as follows.
[ServiceContract] public interface ISocialStatus {
[OperationContract]
[WebInvoke(UriTemplate =
"/statuses/update.xml?status={text}")]
void UpdateStatus(string text);
}
Which code segment should you use to update the social status?

A) using (ChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>(typeof(ISocialStatus)))
{
factory.Credentials.UserName.UserName = user.Name;
factory.Credentials.UserName.Password = user.Password;
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus);
}
B) using (ChannelFactory<ISocialStatus> factory =
new ChannelFactory<ISocialStatus>("POST"))
{
factory.Credentials.Windows.ClientCredential.UserName =
user.Name;
factory.Credentials.Windows.ClientCredential.SecurePassword.
SetAt(0, Convert.ToChar(user.Password) );
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus); }
C) using (WebChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>(typeof(ISocialClient)))
{
factory.Credentials.Windows.ClientCredential.UserName =
user.Name;
factory.Credentials.Windows.ClientCredential.SecurePassword.
SetAt(0, Convert.ToChar(user.Password) );
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus); }
D) using (WebChannelFactory<ISocialStatus> factory =
new WebChannelFactory<ISocialStatus>("SocialClient"))
{
factory.Credentials.UserName.UserName = user.Name;
factory.Credentials.UserName.Password = user.Password;
ISocialStatus socialChannel = factory.CreateChannel();
socialChannel.UpdateStatus(newStatus);
}

3. 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) For each OperationContract exposed by IContosoService , apply the following attribute. <FaultContract(GetType(Exception))>
B) Apply the following attribute to the ContosoService class. <ServiceBehavior(IncludeExceptionDetailInFaults:=True)>
C) 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>
D) 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.

4. You are configuring a routing service to call a target service. The routing service has no knowledge of the target service's data tyes other than the service contract.
The operation contract for all of the methods of the target service specifies IsOneWay=true.
You need to specify the endpoint information for the routing service.
What should you do?

A) In the routing service configuration file, specify "*" for the client endpoint contract and "*" for the service endpoint contract.
B) In the routing service configuration file, specify "*" for the client endpoint contract and System.ServiceModel.Routing.IRequestReplyRouter for the service endpoint contract.
C) In the target service configuration file, specify "*" for the client endpoint contract and "*" for the service endpoint contract.
D) In the routing service configuration file, specify "*" for the client endpoint contract and System.ServiceModel.Routing.ISimplexDatagramRouter for the service endpoint contract.

5. You have a secured Windows Communication Foundation (WCF) service.
You need to track unsuccessful attempts to access the service.
What should you do?

A) Set the includeExceptionDetaillnFaults attribute of the serviceDebug behavior to true.
B) Set the serviceAuthorizationManagerType attribute of the serviceAuthorization behavior to Message.
C) Set the Mode attribute of the security configuration element to Message.
D) Set the messageAuthenticationAuditLevel attribute of the serviceSecurityAudit behavior to Failure.

Solutions: