A Windows Communication Foundation (WCF) solution uses the following contracts. (Line numbers are included for reference only.)
01 [ServiceContract(CallbackContract = typeof(INameService))]
02 public interface IGreetingService
03 {
04 [OperationContract]
05 string GetMessage();
06 }
08 [ServiceContract]
09 public interface INameService
10 {
11 [OperationContract]
12 string GetName();
13 }
When the client calls GetMessage on the service interface, the service calls GetName on the client callback. In the client, the class NameService implements the callback contract.
The client channel is created as follows.
22 In stanceContext callbackContext =
new InstanceContext(new NameService("client"));
25 DuplexChannelFactory<IGreetingService> factory =
new DuplexChannelFactory<IGreetingService>(
typeof(NameService), binding, address);
26 IGreetingService greetingService = factory.CreateChannel();
You need to ensure that the service callback is processed by the instance of NameService.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

• A. Add the following code segment after line 26. callbackContext.IncomingChannels.Add((IDuplexChannel)greetingService);
• B. Change line 25 to the following code segment. DuplexChannelFactory<IGreetingService> factory = new DuplexChannelFactory<IGreetingService>( callbackContext, binding, address);
• C. Add the following code segment after line 26. callbackContext.OutgoingChannels.Add((IDuplexChannel)greetingService);
• D. Change line 26 to the following code segment. IGreetingService greetingService = factory.CreateChannel(callbackContext);

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 ASR NET Forms Authentication model. You add a service tile named Authentication. svc that contains the following code segment
<%@ SenviceHost Servicee"System
Web Application Services Authentication Service"Factory="System.Web.ApplicationServices.AppicationServicesHostFactory' %>.
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/profileService element, set the enabled attribute to true.
• B. In the system web.extensions/scripting/webServices/authenticationService element, set the enabled attribute to true.
• C. Add a service endpoint with basicHttpBinding for the contract System.WebApplicationServices.AuthenticationService.
• D. Add a custom service behavior named AuthenticationServiceTypeBehaviors with a serviceAuthenticationManager element that has serviceAuthenticationManagerType set to System Web Security. SQL Membership Provider

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. var client = new Social Client ("POST") ; client.Endpoint.Behaviors.Add( new WebHttpBehovior());
• B. var client = new SocialClient("SocialClient"); c1lent.Endpoint.Behaviors.Add( new WebHttpBehovior());
• C. var client = new Social Client ("POST"); client.Endpoint.Behaviors.Add( new WebScriptEnoblingBehovior());
• D. var client = new SocialClient("SocialClient"); client.Endpoint.Behaviors.Add( new WebScriptEnoblingBehovior());

You are creating a Windows Communication Foundation (WCF) service. The service endpoints change frequently.
On the service, you add a new ServiceDiscoveryBehavior to the Behaviors collection of the ServiceHost Description property.
You need to ensure that client applications can communicate with the service and discover changes to the service endpoints.
What should you do?

• A. Use the FindCriteria class and the UdpDiscoveryEndpoint class to set up the binding in the client application.
• B. Add a new AnnouncementClient to the Behaviors collection in the client application.
• C. Add a new ServiceDiscoveryBehavior to the Behaviors collection in the client application.
• D. Use the DiscoveryProxy class and the EndpointDiscoveryMetadata class to set up the binding in the client application.

You are developing a Windows Communication Foundation (WCF) service that must be discoverable.
You need to ensure that the ServiceHost instance supports multiple discovery versions.
What should you do?

• A. Specify a unique DiscoveryVersion parameter for each endpoint constructor.
  Use a unique value for the Address property of each endpoint.
• B. Specify a unique DiscoveryVersion parameter for each endpoint constructor.
  Use the same value for the Address property of each endpoint.
• C. Use the endpoint constructor without the DiscoveryVersion parameter.
  Use the same value for the Address property of each endpoint.
• D. Use the endpoint constructor without the DiscoveryVersion parameter.
  Use a unique value for the Address property of each endpoint.