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

1. You are building a client for a Windows Communication Foundation (WCF) service. You need to create a proxy to consume this service which class should you use?

A) CommunicationObject
B) ChannelFactory <TChannel>
C) ClientRuntime
D) ServiceHost

2. You have a Windows Communication Foundation (WCF) service that uses a multicast protocol as a custom transport. The service implements the channel framework.
You need to choose a message exchange pattern for the transport.
What should you use?

A) Datagram by using the IOutputChannel interface for clients and the IInputChannel interface for the service.
B) Half-Duplex by using the IRequestChannel interface for clients and the IReplyChannel interface for the service.
C) Request-Response by using the IRequestChannel interface for clients and the IReplyChannel interface for the service.
D) Duplex by using the IDuplexChannel interface for both clients and the service.

3. An ASP NET application hosts a RESTful Windows Communication Foundation (WCF)
service at /ServiceslContoso.svc.
The service provides a JavaScript resource to clients. You have an explicit reference to the
JavaScript in your page markup as follows.
<script type = text/javaScript' srcsIServices/Contoso. svc/js" /> You need to retrieve the debug version of the service JavaScript. What should you do?

A) In the <%@ Page %s header, set the Debug attribute to true.
B) In the script tag, append debug to the src attribute
C) In the <%@ ServiceHost %> header for /ServiceslContoso.svc, set the Debug attribute to true.
D) In the script tag, add a debug attribute and set its value to true.

4. You develop a Windows Communication Foundation (WCF) service that employees use to access bonus information. You define the following service contract. (Line numbers are included for reference only.)
01 [ServiceContract(SessionMode = SessionMode.Required)]
02 public interface IFinancialService
03 {
04 [OperationContract]
05 string Login(int employeeID, string passwordHash);
06
07 [OperationContract]
08 double GetBonus(int month);
09
10 [OperationContract(IsTerminating = true)]
11 void Logout();
12 }
Client applications can invoke methods without logging in.
You need to ensure that the client applications invoke Login before invoking any other method.
You also need to ensure that client applications cannot consume the service after invoking Logout.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Replace line 07 with the following code. [OperationContract(IsInitiating = false)]
B) Replace line 10 with the following code. [OperationContract(IsInitiating = false, IsTerminating = true)]
C) Replace line 04 with the following code. [OperationContract(IsInitiating = false)]
D) Replace line 04 with the following code. [OperationContract(IsInitiating = true, IsTerminating = true)]

5. You are developing a Windows Communication Foundation (WCF) service. The service needs to access out-of-process resources.
You need to ensure that the service accesses these resources on behalf of the originating caller.
What should you do?

A) Set the PrincipalPermissionAttribute on the service contract and update the binding attribute in the endpoint element of the configuration file to wsHttpBinding.
B) Set the PrincipalPermissionAttribute on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to wsHttpBinding.
C) Set the value of ServiceSecurityContext.Current.WindowsIdentity.ImpersonationLevel to TokenImpersonationLevel.Impersonation.
D) Set the value of ServiceSecurityContext.Current.WindowsIdentity.ImpersonationLevel to TokenImpersonationLevel.Delegation.

Solutions: