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Microsoft TS: Windows Communication Foundation velopment with Microsoft .NET Framework 4 Sample Questions:
1. A Windows Communication Foundation (WCF) service that handles corporate accounting must be changed to comply with government regulations of auditing and accountability.
You need to configure the WCF service to execute under the Windows logged-on identity of the calling application.
What should you do?
A) Within the service configuration, add a serviceAuthorization behavior to the service, and set impersonateCallerForAllOperations to true.
B) Within the service configuration, add a serviceAuthenticationManager behavior to the service, and set serviceAuthenticationManagerType to Impersonate.
C) Within the service configuration, add a serviceCredentials behavior to the service, and set type to Impersonate.
D) Within the service configuration, add a serviceSecurityAudit behavior to the service, and set serviceAuthorizationAuditLevel to SuccessOrFailure.
2. You are working with a Windows Communication Foundation (WCF) client application that has a generated proxy named SampleServiceProxy.
When the client application is executing, in line 02 of the following code, the channel faults (Line numbers are included for reference only.)
01 SampleServiceProxy proxy new SampleServiceProxy()
02try
03{
04proxy Processlnvoice(invoice);
05)
06catch
07{
08 (proxy. State == CommunicationState. Faulted)
09{
11)
12)
13 proxy Update Customer(customer);
You need to retumn proxy to a state in which it can successfully execute the call in line 13.
Which code segment should you use at line 10?
A) proxy new SampleServiceProxy0;c
B) proxy.Open()
C) proxy.CloseO;
D) proxy.AbortO,
3. You are creating a Windows Communication Foundation (WCF) service. You do not want to expose the internal implementation at the service layer. You need to expose the following class as a service named Arithmetic with an operation named Sum.
public class Calculator
{ public int Add(int x, int y)
{
}
}
Which code segment should you use?
A) [ServiceContract(ConfigurationName="Arithmetic")] public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
.....
}
}
B) [ServiceContract(Name="Arithmetic")]
public class Calculator
{ [OperationContract(Name="Sum")]
public int Add(int x, int y)
{
....
}
}
C) [ServiceContract(Name="Arithmetic")] public class Calculator
{
[OperationContract(ReplyAction="Sum")]
public int Add(int x, int y)
{
.....
}
}
D) [ServiceContract(Namespace="Arithmetic")]
public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
.....
}
}
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) Apply the following attribute to the ContosoService class. <ServiceBehavior(IncludeExceptionDetailInFaults:=True)>
D) For each OperationContract exposed by IContosoService , apply the following attribute. <FaultContract(GetType(Exception))>
5. You have an existing Windows Communication Foundation (WCF) Web service.
The Web service is not responding to messages larger than 64 KB.
You need to ensure that the Web service can accept messages larger than 64 KB without
generating errors.
What should you do?
A) Increase the value of maxRequestLength on the httpRuntime element.
B) Increase the value of maxBufferSize on the endpoint binding.
C) Increase the value of maxBufferPoolSize on the endpoint binding.
D) Increase the value of maxReceivedMessageSize on the endpoint binding.
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: D | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: D |





