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

1. 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 TravelServiceClient();
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.GetFlightCompleted += new EventHandler<GetFlightCompletedEventArgs>( GetFlightCallback); client.GetFlightAsync();
C) IAsyncResult asyncResult = client.BeginGetFlight( GetFlightCallback, client); client.EndGetFlight(asyncResult);
D) client.GetFlight(); client.BeginGetFlight(GetFlightCallback, null);

2. You are creating an application that consumes a Windows Communication Foundation
(WCF) service. The service implements the IService contract. The client application contains the CallbackHandler class, which implements IServiceCallback.
You need to ensure that a client proxy is created that can communicate with the service over a duplex channel.
Which code segment should you use?

A) Dim handler = New CallbackHandler()
Dim clientFactory =
New DuplexChannelFactory( Of IService)(
GetType(CallbackHandler),
New USDualHttpBindingO )
Dim client = clientFactory.CreateChannel(
New InstanceContext (handler) ,
New EndpointAddress ("") )
B) Explanation:
QUESTIO NO: 98 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
C) Dim handler = New CallbackHandler()
Dim clientFactory =
New DuplexChannelFactory(Of IService)(
New WSHttpContextBinding() )
Dim client = clientFactory.CreateChannel( New InstanceContext(handler),
New EndpointAddress (""))
D) Dim handler - New CallbackHandler()
Dim clientFactory =
New DuplexChannelFactory(Of IService)(
GetType(CallbackHandler),
New HSDualHttpBindingO) Dim client = clientFactory.CreateChannel( New
EndpointAddress ("") )
E) Dim handler = New CallbackHandler()
Dim clientFactory =
New DuplexChannelFactory(Of IService)( New WSHttpBinding())
Dim client = clientFactory.CreateChannel(
New InstanceContext(handler),
New EndpointAddress (""))

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) Create the persistence provider database and configure the persistenceProvider element of the service behavior to point to that database.
B) 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.
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 a Windows Communication Foundation (WCF) service that implements the following service contract.
<ServiceContract()>
Public Interface IOrderProcessing
<OperationContract()>
Sub ApproveOrder(ByVal id As Integer)
End Interface
You need to ensure that only users with the Manager role can call the ApproveOrder method. What should you do?

A) In the method body, check the Rights.PossessProperty property to see if it contains Manager.
B) Add a SecurityPermission attribute to the method and set the SecurityAction to Demand.
C) In the method body, create a new instance of WindowsClaimSet. Use the FindClaims method to locate a claimType named Role with a right named Manager.
D) Add a PrincipalPermission attribute to the method and set the Roles property to Manager.

5. You are developing a Windows Communication Foundation (WCF) service. You enable logging in the configuration file. The opening tag is defined as follows.

You need to ensure that logging is implemented so that only messages with SOAP headers are logged.
What should you add to the filters element of the application configuration file?