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

1. A Windows Communication Foundation (WCF) application exposes a service as a SOAP endpoint for consumption by cross-platform clients. During integration testing, you find that one of the clients is not generating the correct messages to the WCF application.
In order to debug the issue and fix the communication, you need to configure the service to log messages received from the client.
What should you do?

A) Set an etwTracking behavior on the service and configure a listener for the System.ServiceModel.MessageLuqqing trace source.
B) Enable messageLogging in the System.ServiceModel diagnostics element configuration and configure a listener for the System.ServiceModel.MessageLogging trace source.
C) Enable messageLogging in the System.ServiceModel diagnostics element configuration and configure a listener for the System.ServiceModel trace source.
D) Set an etwTracking behavior on the service and configure a listener for the System.ServiceModel trace source.

2. A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients (Line numbers are included for reference only)
01 <ServiceContract0>
02PuElic Interface ITeamMessageService
04 <OperationContractO>
05Function GetMessage() As String
06
07 <OperationContract0>
08Sub PutMessage(Byval message As String)
O9End Interface
The code for the serAce class is as follows.
10 Public Class TeamMessageService0
11 Implements lTearmt4essageService
12
1 3Dim key As Guid = Guid.NewGuid()
1 4Dim message As String = "Today's Message'
15
16PuUic Function GetMessage0As String -
1 7lmpements lTearm*AessageServiceGetMessage
18
1 9Retun String. Fommat("Message:{0) Key:{ 1}", message, key)
20End Function
21
22PubIic Sub PutMessage(ByV message As Stnng) -
23lmpements lTearrlessageService PutMessage
24
25Me message = message
26End Sub
27
28End Class
The service is self-hosted The hosting code rs as follows
29Dim host As ServiceHost =
New ServiceHost(GetType(TearrwiessageSeMce))?
3ODim binding As Basic HttpBindngt
New BasicHttpBindiig(BasicHttpSecurityMode. None) 31 host.AddServiceEndpoint(
"MyAppication lTearrtAessageService", binding
Thttp /Ilac aihost. 1 2345)
32host Open()
You need to ensure that all clients calling GetMessage will retrieve the same string, even if the message is upd(ed by clients calling PutMessage what should you do?

A) Add the following attribute to the TeamMessageService class, before line 1 0002E
<ServiceBehavior( lnstanceContextll ode. = InstanceContextMode. PerSession)>
B) Add the following attribute to the TeamMessageService class, before line 10.
<ServceBehavior(lnstanceContextMode lnstanceContextMode. Single)>
C) Pass a service instance to the instancing code in line 29, as follows.
Dim host As ServiceHost z New ServiceHost(New TeamMessageServiceO)
D) Redefine the message string in line 14, as follows.
Shared message As String "Today's Message"
Then change the implementation of PutMessage in lines 22-26 to the following
Public Sub PutMessage(ByVal message As rng) - Implements ITean-
MessageService.PutMessage
TeamMessageSenAce.message = message End Sub

3. You develop a Windows Communication Foundation (WCF) service that includes the following code. (Line numbers are included for reference only.)

ServiceB must not accept reentrant service calls. You need to modify the behavior of the service. What should you do?

A) Replace the code segment at line 01 with the following code segment: <ServiceBehavior (InstanceContextMode:=InstanceContextMode.Single) >
B) Insert the following code segment at line 07: <ServiceBehavior(ReleaseServiceOnTransactionTransactionComplete:=True)>
C) Insert the following code segment at line 07: <ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Multiple)>
D) Insert the following code segment at line 07: <ServiceBehavior(ReleaseServiceInstanceOnTransactionComplete:=False)>

4. You are using tracing to diagnose run-time issues when you look at the traces for the service in Svc Trace viewer exe, you see what is shown in the exhibit (Click the Exhibit button)

The exception trace is selected in Svc Trace reviewer exe.
You need to interpret the trace results to determine where the error occurred and what to do next.
What should you do?

A) This issue occurred in the Service Host during Service Host. Open. Compare the security settings for any endpoints that use an MSMQ transport to the security configuration of the MSMQ queue used by the endpoint
B) This issue occurred at the ServiceHost when accepting an initial set of messages from MSMQ.Log all messages sent between the clients and sever.
C) This issue occurred in the ServiceHost during ServiceHost Open. Enable WMI by adding the following configuration to the system.serviceModel configuration section in the application configuration file <diagnostics wmiProviderEnabledetrue'!> Restart the application and inspect the endpoints visible through WMI
D) This issue occurred at the Service Host when receiving a message Compare the security configurations on the client and server to make sure that they are compatible

5. You implement a Windows Communication Foundation (WCF) service. The service is hosted in Internet Information Services (IIS).
The service must use X.509 certificates to authorize specific methods.
You need to configure the service.
What should you do? (Each correct answer presents part of the solution. Choose two.)

A) Set the value of the ControlEvidence property of the SecurityPermissionAttribute to the identity of the certificate.
B) In the web.config file for the service, in the serviceAuthorization element, set the value of the PrincipalPermissionMode attribute to UseWindowsGroups.
C) In the web.config file for the service, in the serviceAuthorization element, set the value of the PrincipalPermissionMode attribute to UseAspNetRoles.
D) Set the value of the Name property of the PrincipalPermissionAttribute to the identity of the certificate.

Solutions: