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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 binding attribute in the endpoint element of the configuration file to wsHttpBinding.
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 bindingConfiguration attribute in the endpoint element of the configuration file to webHttpBinding.

2. A Windows Communication Foundation (WCF) solution exposes the following service over a TCP binding. (Line numbers are included for reference only.)
01 [ServiceContract]
02 [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]
03 public class DataAccessService
04 {
05 [OperationContract]
06 public void PutMessage(string message)
07 {
08 MessageDatabase.PutMessage(message);
09 }
10 [OperationContract]
11 public string[] SearchMessages(string search)
12 {
13 return MessageDatabase.SearchMessages(search);
14 }
15 }
MessageDatabase supports a limited number of concurrent executions of its methods.
You need to change the service to allow up to the maximum number of executions of the methods of MessageDatabase. This should be implemented without preventing customers from connecting to the service.
What should you do?

A) Add a throttling behavior to the service, and configure the maxConcurrentSessions.
B) Change the service behavior as follows. [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.Single)]
C) Add a throttling behavior to the service, and configure the maxConcurrentCalls.
D) Change the service behavior as follows. [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Single, InstanceContextMode = InstanceContextMode.PerSession)]

3. Your company has a Windows Communication Foundation (WCF) service at the URL http://services.contoso.com/OrderLookupService.svc.
The <system.serviceModel> section of the configuration file is as follows. (Line numbers are included for reference only.)
01 <system.serviceModel>
02
<behaviors>
03 <serviceBehaviors>
04 <behavior>
05 <serviceDebug
includeExceptionDetailInFaults="false"/>
06
07 </behavior>
08 </serviceBehaviors>
09 </behaviors>
10 <serviceHostingEnvironment
multipleSiteBindingsEnabled="true" />
11 </system.serviceModel>
You need to ensure that the service publishes the WSDL description at
http://services.contoso.com/OrderLookupService.svc?wsdl.
What should you do?

A) Insert the following element at line 06.
<serviceMetadata httpGetEnabled="false" />
B) Change the serviceDebug element at line 05 as follows.
<serviceDebug includeExceptionDetailInFaults="true"/>
C) Insert the following element at line 06.
<serviceMetadata httpGetEnabled="true" />
D) Insert the following element at line 06.
<serviceDiscovery>
< announcementEndpoints>
<endpoint name="wsdlAnnouncement" kind="udpAnnouncementEndpoint" />
</announcementEndpoints>
</serviceDiscovery>

4. You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data.
The client applications call the service in a transaction. The service contract is defined as follows. (Line numbers are included for reference only.)

Customers report that the transaction completes successfully even if the Update method throws an exception.
You need to ensure that the transaction is aborted if the Update method is not successful.
What should you do?

A) insert the following line at line 22. throw;
B) Insert the following line at line 09. [ServiceBehavior( TransactionAutoCompleteOnSessionClose = false)]
C) Insert the following line at line 09. [ServiceBehavior( TransactionAutoCompleteOnSessionClose = true)]
D) Replace line 12 with the following line. [OperationBehavior( TransactionScopeRequired = true, TransactionAutoCoroplete - false)]

5. DRAG DROP
You develop a Windows Communication Foundation (WCF) service that is hosted within a console application. The service implements the IRegistrationService interface in a class named RegistrationService. The service uses the following endpoint URL: http://localhost:8080/registrationservice/basic
You need to configure the console application to host the service.
How should you complete the relevant code? (To answer, drag the appropriate code segment to the correct location in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

Solutions: