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

1. A Windows Communication Foundation (WCF) solution uses two services to manage a shopping cart. Service
A processes messages containing line items that total between $0 and $500. Service B processes messages containing line items that total more than $500.
All messages are of equal importance to the business logic.
You need to route incoming messages to the appropriate services by using WCF routing.
Which two message filters should you add to the router? (Each correct answer presents part of the solution. Choose two.)

A) a message filter with a priority of 100 that will forward messages that total between $0 and $500 to Service A
B) a message filter with a priority of 0 that will forward all messages to Service B
C) a message filter with a priority of 0 that will forward messages that total between $0 and $500 to Service A
D) a message filter with a priority of 100 that will forward all messages to Service B

2. A self-hosted Windows Communication Foundation (WCF) service uses a secure HTTP
binding with a custom principal permission mode. The binding requires users to provide their Windows logon credentials.
You need to retrieve the identity of the caller.
What are two possible properties you can use to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) HttpContext.Current.User.Identity.Name
B) ServiceSecurity Context.Current.Primary Identity.Name
C) OperationContext.Current.ServiceSecurity Context.Primary Identity.Name
D) Thread.CurrentPrincipal.Identity-Name

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

4. You are developing a Windows Communication Foundation (WCF) client application. The client application contains the following code.

The configuration file contains the following lines.

You need to ensure that the service is consumed.
Which code segment should you use?

A) Dim client As SocialClienc = New SocialClienc("POST") client.Endpoint.Behaviors.Add( New WebHttpBehavior())
B) Dim client As SocialClient = New SocialClient("SocialClient") client.Endpoint.Behaviors.Add( New WebHttpBehavior())
C) Dim client As SocialClient = New SocialClient("SocialClient") client.Endpoint.Behaviors.Add( New WebScriptEnablingBehavlor())
D) Dim client As SocialClient = New SocialClient("POST") client.Endpoint.Behaviors.Add( New WebScriptEnablingBehovior())

5. You are developing a Windows Communication Foundation (WCF) service. You enable message logging, trace listeners, activity propagation, and tracing on the trace sources.
You have the following code segment in the client application. (Line numbers are included for reference only.)

You encounter errors when your client application consumes the service.
You need to ensure that your client application can correlate tracing information with the service.
Which code segment should you add at line 04?

A) Option D
B) Option B
C) Option C
D) Option A

Solutions: