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Last Updated: Jun 23, 2026
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1. You create a Windows Communication Foundation service by using Microsoft .NET Framework 3.5. The service contains the following code segment.
Client applications pass an instance of the Customer class to the service.
You create a new version of the data contract and replace the Name property with the FirstName property. You need to ensure that the existing client applications can continue to consume the
service without modifying their code. Which code segment should you use?

A) Option B
B) Option C
C) Option A
D) Option D
2. You create a Windows Communication Foundation service by using Microsoft .NET Framework 3.5. You create the following service contract.
[ServiceContract]
public interface IMath
{
[OperationContract]
int Add(int num1, int num2);
}
You need to add an operation contract to perform the Add operation asynchronously. Which operation contract should you use?
A) [OperationContract(AsyncPattern=true)]IAsyncResult BeginAdd(int num1, int num2);int EndAdd (IAsyncResult res);
B) [OperationContract]IAsyncResult BeginAdd(int num1, int num2);[OperationContract]int EndAdd (IAsyncResult res);
C) [OperationContract(AsyncPattern=true)]IAsyncResult BeginAdd(int num1, int num2,
AsyncCallback cb,
object state);int EndAdd(IAsyncResult res);
D) [OperationContract]int BeginAdd(int num1, int num2, AsyncCallback cb, object state);IAsyncResult EndAdd ();
3. You create a Windows Communication Foundation service by using Microsoft .NET Framework 3.5. You want to enable message logging. You add the following code fragment to the service configuration file.
<system.diagnostics> <sources> <source
name="System. ServiceModel. Messagel_ogging">
<listeners> odd name="messages"
type="System. Diagnostics. XmlWriterTraceListener" />
</listeners> </source> </sources> </system.diagnostics> You receive an exception.
You need to successfully enable message logging. What should you do?
A) Set the switchValue attribute to verbose.
B) Remove the message filter.
C) Set the maximum size of the message to be logged to 256K.
D) Set the initializeData attribute to the name of a log file.
4. You are creating a Windows Communication Foundation (WCF) service by using Microsoft .NET Framework 3.5.
You create an instance of the ServerHost class. You plan to host the WCF service in a Windows service.
You need to link the lifetime of the WCF service to the lifetime of the Windows service.
Which three actions should you perform on the instance of the ServerHost class? (Each correct answer presents part of the solution. Choose three.)
A) Override the OnStop method.
B) Override the InitializeLifetimeService method.
C) Override the OnStart method.
D) Subscribe to the Faulted event.
E) Override the RequestAdditionalTime method.
F) Override the GetLifetimeService method.
5. You create a Windows Communication Foundation (WCF) service by using Microsoft .NET Framework 3.5. Client applications that run on different platforms access the WCF service.
These applications transmit confidential data to the WCF service. You write the following binding configuration.
....
<binding name="TransportSecurity" >
<security mode="Transport" />
</binding>
...
You need to configure the service for optimum interoperability and optimum security.
Which code fragment should you use?
A) Option B
B) Option C
C) Option A
D) Option D
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: A,C,F | Question # 5 Answer: B |
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