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

1. You are hosting a Windows Communication Foundation (WCF) service under Microsoft Internet Information Services (IIS) 7.0.
You have set up a Web site in IIS Manager. The physical path is C:\wwwroot\Calendar. There is a Calendar.svc file in the C:\wwwroot\Calendar folder. It contains the following directive.
<%@ ServiceHost Language="VB" Debug="true" Service="Calendar.Calendar" CodeBehind="Calendar.svc.vb" %>
The Calendar.svc.vb file contains the source for the Calendar class in the Calendar namespace. You compile this code into the Calendar.dll file.
You need to deploy your service to the Web site.
What should you do?

A) Copy the Calendar.svc.vb file to the C:\wwwroot\Calendar\bin folder.
B) Copy the Calendar.dll file to the C:\wwwroot\Calendar\bin folder.
C) Copy the Calendar.dll file to the C:\wwwroot\Calendar\code folder.
D) Copy the Calendar.svc.vb file to the C:\wwwroot\Calendar\code folder.

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

3. You are developing a Windows Communication Foundation (WCF) service to provide an in-memory cache. The following code is part of your solution. (Line numbers are included for reference only.)
01 02 Public Interface IlnMemoryCacheService 03 04 <OperationContract()> 05 Function GetCachedItem( ByVal key As String) As String 06 07 <OperationContract() > 08 Sub CacheItem( ByVal key As String, ByVal item As String) 09 10 End Interface 11 12 <ServiceBehavior( InstanceContextMode:=InstanceContextHode.Single)> 13 Public Class CacheService 14 Implements IlnHemoryCacheService 15 16 Dim cache As Hashtatale - New Hashtable)> 17 18 Public Function GetCachedItem( ByVal key As String) As String mplements IInHemoryCacheService.GetCachedltem 19 20 Return cache (key) .ToStrlng() 21 22 End Function
23 24 Public Sub Cacheltem( ByVal key As String, ByVal item As String) Implements ilnMemoryCacheService.Cacheltem Then 25 26 If (cache.Contains(key) 27 cache.Remove(key) 28 End If 29 30 cache.Add(key, item) 31 32 End Sub
34 End Class
Users report that the cache is getting updated with cache changes of other users. You need to ensure that each user's cache is maintained and isolated from other users.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) At line 12, replace InstanceContextHode.Single with InstanceContextHode.PerCall.
B) Insert the following code at line 01. <ServiceContract(SessionHode:=SessionHode.Required)>
C) At line 12, replace InstanceContextHode.Single with InstanceContextHode.PerSession.
D) Insert the following code at line 01. <ServiceContract(SessionMode:=SessionHode.NotAllowed)>

4. You are developing a Windows Communication Foundation (WCF) service that contains the following code segment.
<ServiceContract()> Public Interface ICustomerService ... End Interface Public Class CustomerService Implements ICustomerService ... End Class
The service is self-hosted in a console application. Older client applications access the service at http://contoso.com:8080/CustomerService/V1. Newer client applications access the service at http://contoso.com:8080/CustomerService/V2.
You need to ensure that any client application can access the service at either address.
Which code segment should you use?

A) Dim serviceAddress1 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V1")
Dim serviceAddress2 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V2")
Dim host As ServiceHost =
New Service Host(GetType(ICustomerService),
New Uri() {serviceAddress1, serviceAddress2})
B) Dim serviceAddress1 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V1")
Dim serviceAddress2 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V2")
Dim host As ServiceHost =
New ServiceHost(GetType(CustomerService),
New Uri() {serviceAddress1, serviceAddress2})
C) Dim serviceAddress As Uri =
New Uri("http://contoso.com:8080/")
Dim host As ServiceHost =
New Service Host(GetType(ICustomerService),
New Uri() {serviceAddress})
host.AddServiceEndpoint(GetType(CustomerService),
New BasicHttpBinding(), "CustomerService/V1")
host.AddServiceEnd point(GetType(CustomerService),
New BasicHttpBinding(), "CustomerService/V2")
D) Dim serviceAddress As Uri =
New Uri("http://contoso.com:8080/")
Dim host As ServiceHost =
New Servic eHost(GetType(CustomerService),
New Uri() {serviceAddress})
host.AddServiceEndpoint(GetType(ICustomer Service),
New BasicHttpBinding(), "CustomerService/V1")
host.AddServiceEndp oint(GetType(ICustomerService),
New BasicHttpBinding(), "CustomerService/V2")

5. A client application calls a Windows Communication Foundation (WCF) service with a proxy class that was generated by Visual Studio.
The service binding was changed from wsHttpBinding to basicHttpBinding. The method signatures in the service contract are changed.
After these changes, the client application receives errors when calling methods on the service.
You need to ensure that the client can invoke methods on the service successfully.
What should you do?

A) Update the configuration file to use basicHttpBinding.
B) Update the service reference.
C) Copy the configuration file elements under the <system.servicelviodel> element from the service back to the client.
D) Enable anonymous authentication for the service.

Solutions: