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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 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) Pass a service instance to the instancing code in line 29, as follows.
Dim host As ServiceHost z New ServiceHost(New TeamMessageServiceO)
B) Add the following attribute to the TeamMessageService class, before line 10.
<ServceBehavior(lnstanceContextMode lnstanceContextMode. Single)>
C) 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
D) Add the following attribute to the TeamMessageService class, before line 1 0002E
<ServiceBehavior( lnstanceContextll ode. = InstanceContextMode. PerSession)>

2. 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 at the ServiceHost when accepting an initial set of messages from MSMQ.Log all messages sent between the clients and sever.
B) 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
C) 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
D) 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

3. 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) 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.
B) Create the persistence provider database and configure the persistenceProvider element of the service behavior to point to that database.
C) Use basicHttpBinding for both the client application and the service.
D) Use wsHttpContextBinding for both the client application and the service.

4. You are creating an ASP.NET Web application that hosts several Windows Communication
Foundation (WCF) services. The services have ASP.NET Compatibility Mode enabled. Users authenticate with the Web application by using a cookie-based ASP.NET Forms Authentication model.
You add a service file named Authentication.svc that contains the following code segment.
<%@ ServiceHost
Service="System.Web.ApplicationServices.AuthenticationService"
Factory="System.Web.ApplicationServices.ApplicationServicesHostFactory" %>
You need to ensure that users can access the WCF services without having to re-authenticate.
Which two configuration settings should you add (Each is part of a complete solution. Choose two.)

A) In the system.web.extensions/scripting/webServices/authenticationService element, set the enabled attribute to true.
B) Add a custom service behavior named AuthenticationServiceTypeBehaviors with a serviceAuthenticationManager element that has serviceAuthenticationManagerType set to System.Web.Security.SqlMembershipProvider.
C) In the system.web.extensions/scripting/webServices/profileService element, set the enabled attribute to true.
D) Add a service endpoint with basicHttpBinding for the contract System.Web.ApplicationServices.AuthenticationService.

5. HOTSPOT
You are developing a Windows Communication Foundation (WCF) service. You implement a data contract to pass complex data to and from the service.
The service includes the following code: You need to verify the order in which the data is serialized.

For each of the following statements, select True if the statement is true. Otherwise, select False.

Solutions: