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

1. The endpoint of a Windows Communication Foundation (WCF) service uses basicHttpBinding for its binding. Your company's policies have changed to require that messages not be sent in clear text.
You must ensure that all messages are encrypted when traveling across the network.
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 ProtectionLevel property on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to webHttpBinding.
C) Set the PrincipalPermissionAttribute on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to wsHttpBinding.
D) Set the ProtectionLevel property on the service contract and update the binding attribute in the endpoint element of the configuration file to wsHttpBinding.

2. You are developing a Windows Communication Foundation (WCF) service to provide shopping cart support. ASP.NET compatibility mode is not enabled.
The shopping cart information must be retained across user visits to the store until the user explicitly empties the cart or submits the cart contents to order.
You need to implement the service as a DurableService.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Use basicHttpBinding for both the client application and the service.
B) In the method to add an item to the shopping cart, serialize the shopping cart contents after adding the current item and storing it in a Session variable.
C) Use wsHttpContextBinding for both the client application and the service.
D) Create the persistence provider database and configure the persistenceProvider element of the service behavior to point to that database.

3. A Windows Communication Foixdation (WCF) solution uses the following contracts (Line numbers are included for reference only)
01 eServiceContract(Callback contract: GetType(lNameService))> 02Putlic Interface I(IeetingService 03 04 <OperationContractO> 05Function GetMessage() As Stnng 06 07End Interface 08 09 <ServiceContractO> 1 OPublic Interface INameService 11 12 <OperationContractO> 1 3Function GetName() As String 14 15 End Interface
The code that implements the KleetingService interface is as follows.
20Public Class GretingService 21Impements lGreaingService 22 23Public Function GetMessage0As String
24lmpements IGredingService. GetMessage
25
26Dim clientChann As INameService =
27OperationContet. Current.
28GetCallbackChamel(Of INameService)()
29Dim clientName As String = clientChannelGetName()
30 Retumn String Format("Hello {O)", clientName)
31
32End Function
33hnd Class
The service is self-hosted The hosting code is as follows.
35Dim host As SeniceHost =
36New ServiceHost(GetType(GrstingService))?
37Dim binding As NetTcpBinding =
38New NetTcpBinding(Sec urityMode. None)
39hostAddServiceEndpoint('Myapplication lGreetingService".
4Obincng, net.tcp:Ilocalhost: 12345W)
41 HotOpen()l
The code that implements the INameService interface is as follows.
42Class NameService
43lmpements INameService
44
45Dim name As String
46
47Public Sub NameService(ByV name As String)
48Me.reme = name
49End Sub
50
51 Public Function GetName() As String
52lmpements INameService. GeName
53
54Reti.rn name
55End Function
56End Class Currently, this code fails at runtime, and an Invalid Operation Exception is thrown at mne 25.
You need to correct the code so that the call from the service back to the client complets successfully
What e two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Add the following attribute to the GreetingSenAce class, before line 20.
<ServiceBehavior(Conc
urrencyMode: zConctrencyMode Reentrant)>
B) Change the service contract definition in line 01 as follows.
<ServiceContract(CallbackContract: sGetType(lNameService), SessionMode
=SessknMode Required)>
C) Add the following attribute to the NameService class, before line 42.
<ServiceBehavior(ConcurrencyMode ConcisrencyMode. Reentrant)>
D) Add the following attribute to the GreetingSence class, before line 20.
<ServiceBehavior(ConcurrencyMode: ConcurrencyMode. Multiple)>

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

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 maxReceivedMessageSize on the endpoint binding.
B) Increase the value of maxBufferSize on the endpoint binding.
C) Increase the value of maxRequestLength on the httpRuntime element.
D) Increase the value of maxBufferPoolSize on the endpoint binding.

Solutions: