A Windows Communication Foundation （WCF） service has a callback contract. You are developing a client application that will call this service. You must ensure that the client application can interact with the WCF service. What should you do？ （）A、 On the O

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You work as a Web Developer at Certkiller.com. You are in the process of creating a Webapplication using Microsoft ASP.NET 3.5.  This application will be part of a solution that contains a Windows Communication Foundation （WCF） service project. The Web application will be used to make calls to a service identified in theWCF service project. Management is planning to host the Web application on a separate serverfrom the WCF service. They want the WCF service to perform remotely. You need to add areference to the WCF service.  What should you do？（）

• A、You should add an assembly reference to the project.
• B、You should add a project reference to the project.
• C、You should add a Web reference to the project.
• D、You should add a service reference to the project.

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You are creating an application using Visual Studio 2010. The application consumes a Windows Communication Foundation (WCF) service.You are adding a service reference to the WCF service. You need to ensure that the generated proxy does not block the calling thread when executing a service method. What should you do when adding the service reference? （）

• A、Set the Collection type to ObservableCollection.
• B、Select the Reuse types in all referenced assemblies option.
• C、Select the Generate asynchronous operations option.
• D、Select the Always generate message contracts option.

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You are building a client for a Windows Communication Foundation (WCF) service. You need to create a proxy to consume this service. Which class should you use?（）

• A、ChannelFactory
• B、 ServiceHost
• C、ClientRuntime
• D、CommunicationObject

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You are creating a client application and configuring it to call a Windows Communication Foundation (WCF) service.When the application is deployed, it will be configured to send all messages to a WCF routing service. You need to ensure that the application can consume the target service after the application is deployed. What should you do?（）

• A、In the client application, add a service reference to the router service. In the client binding configuration, specify the address of the router service.
• B、In the client application, add a service reference to the target service. In the client binding configuration, specify the address of the target service.
• C、In the client application, add a service reference to the router service. In the client binding configuration, specify the address of the target service.
• D、In the client application, add a service reference to the target service. In the client binding configuration, specify the address of the router service.

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You develop a Windows Communication Foundation (WCF) service. It is used exclusively as an intranet application and is currently unsecured. You need to ensure that the service meets the following requirements: The service now must be exposed as an Internet application. The service must be secured at the transport level. Impersonation and delegation cannot be enabled. What should you use? （）

• A、basicHttpBinding and HTTP
• B、basicHttpBinding and Kerberos
• C、wsHttpBinding and Kerberos
• D、wsHttpBinding and HTTPS

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You are developing a client application that consumes a Windows Communication Foundation (WCF) service. The operation contract is as follows. [OperationContract] [FaultContract(typeof(SalesFault))] string GetSales(string saleId);（） The service configuration file contains the following line in the serviceBehaviors section. A divide-by-zero exception is not being handled by the service. You need to ensure that the exception is caught in the client application. Which type of exception should the client catch?（）

• A、TimeoutException
• B、FaultException
• C、DivideByZeroException
• D、FaultException<SalesFault>

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

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You are developing a Windows Communication Foundation (WCF) service. Client applications require reliable sessions to access the service.Users report that they receive ServerTooBusyException errors when their client application tries to establish a session. You need to ensure that the service can handle a minimum of 30 client connection requests. Which ReliableSessionBindingElement property should you configure?（）

• A、MaxRetryCount
• B、MaxTransferWindowSize
• C、MaxPendingChannels
• D、InactivityTimeout

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You are developing a client application that consumes a Windows Communication Foundation (WCF) service. You use the svcutil.exe utility to create a proxy for the service. You use the svcutil.exe switches that generate asynchronous calls. GetFlight is a service operation that takes no parameters and returns a string. The GetFlightCallback method must be called when the service operation returns.You create an instance of the client proxy with the following code:var client = new TranvelServiceClient（　）;You need to ensure that a callback is received when the GetFlight operation is called asynchronously. Which code segment should you use?（）

• A、client.BeginGetFlight(GetFlightCallback, null); client.GetFlight();
• B、client.GetFlight(); client.BeginGetFlight(GetFlightCallback, null);
• C、client.GetFlightCompleted += new EventHandler(GetFlightCallback); client.GetFlightAsync();
• D、IAsyncResult asyncResult = client.BeginGetFlight(GetFlightCallback, client); client.EndGetFlight(asyncResult);

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You create a Windows Communication Foundation (WCF) service and deploy it with wsHttpBinding and message security enabled.You create an intermediate WCF service for logging messages sent to the primary service.The intermediate service is called via endpoint behaviour. The primary service is receiving malformed data from a client application.You need to enable inspection of the malformed data and prevent message tampering. What do you do?（）

• A、Specify a protection level of None in the contract for the intermediate service. Disable message and transport security from the client application configuration file.
• B、Specify a protection level of Sign in the contract for the intermediate service. Disable transport security from the client application configuration file.
• C、Modify the binding on the intermediate service to use netNamedPipeBinding.
• D、Modify the binding on the intermediate service to use webHttpBinding.

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A Windows Communication Foundation (WCF) service has a callback contract. You are developing a client application that will call this service.You must ensure that the client application can interact with the WCF service. What should you do?（）

• A、On the OperationContractAttribute, set the AsyncPattern property value to true.
• B、On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client.
• C、On the client, create a proxy derived from DuplexClientBase<TChannel >.
• D、On the client, use GetCallbackChannel<T >.

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