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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 uses the following code to consume a Windows
Communication Foundation (WCF) service. (Line numbers are included for reference only.)
01 Dim myBinding As BasicHttpBinding =
New BasicHttpBinding()
02 Dim myEndpointAddress As EndpointAddress =
New EndpointAddress(
"http://contoso.com/TaxService.svc")
04 Dim client As ITaxService =
channelFactory.CreateChannel()
05 Dim data As String = client.GetData(1)
You need to consume the service.
Which code segment should you insert at line 03?

A) Dim channelFactory =
New ChannelFactory(Of ITaxService)(myBinding)
B) Dim channelFactory =
New ChannelFactory(Of ITaxService)()
C) Dim channelFactory =
New ChannelFactory(Of ITaxService)
(myBinding, myEndpointAddress)
D) channelFactory =
New ChannelFactory(Of ITaxService)
("http://contoso.com/TaxService.svc")

2. 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 ProtectionLevel property on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to webHttpBinding.
D) Set the PrincipalPermissionAttribute on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to
wsHttpBinding.

3. You are developing a Windows Communication Foundation (WCF) service that executes a long-running operation.
The service is accessed from your business applications in a server transaction in which the client does not participate.
You need to ensure that the transaction times out and aborts if the operation has not completed within 45 seconds.
What should you do?

A) Set the service binding sendTimeout attribute to 00:00:45.
B) Apply [OperationBehavior (TransaccionScopeRequired=false)] to the service operation.
C) Apply f ServiceBehavior (TransaccionTlmeout="00:00:45")] to the service implementation.
D) Set the service binding receiveTimeout attribute to 00:00:45.

4. A Windows Communication Foundation (WCF) service implements the following cortract.
<ServiceContract0>? Public Interface lHeloServic e <operationContractQ> <WebGet(UriTempbte: ="helloname={name}")s Function SayHello(Byval name As String) As nng End Interface The implementation is as follows Public Class HelloService Implements IHelloService
Public Function SayHello(ByVal name As String) As String - Implements lHelloServiceSayHello
Retumn "Hello "& name
End Function
End Cesst
The service is self-hosted, and the hosting code is as follows.
Dim stHost As WebServiceHo = CreateHost()
svcHo Open()
Consde ReadLine()
svcHoaClose()
You need to implement CreateHost so that the service has a single endpoint hosted
http:/Ilocalhost8000/HeloService.
Which code segment should you use?

A) Dim baseAddress As Ur New Uri("http:/i1ocahost:8000r) Dim svcHo As WebServiceHost
=
New WebServiceHost(GetType(HelloService), baseAddress)
svc Host.AddServiceEndpoint(GdType(lHelloService),?
New Web Http Binding (WebHttpSec urityMode None),
HelloService)
Return svc Host
B) Dim svc Host As WebSennceHost = New WebServiceHost(GetType(HdloService))
svc HotsAddServiceEndpoint(GdType(lHelloService),
New WebHttpBinding(WebHttpSecurityModeNone),
"http:/Ibc alhost 8000!HelloService")
Return svc Host
C) Dim baseAddress As Ur = New Uri("http/I1ocahost 8OOOP Dim svcHo As
WebServiceHost = New
WebServiceHost(New HelloService0, baseAddress)
svc HostAddServiceEndpoint(GdType(IHelIoService),
New WebHttpBinding(WebHttpSecuntyMode None),
"HelloService")
Return svc Host
D) Dim svc Host As WebServiceHost = New WebServiceHost(New HelloSennceO)
svcHost.AddServiceEndpoint(GetType(IHelloService),
New WebHttpBinding(WebHttpSecurityModeNone),
Thttp://bc aihost: 8000/HelloSennce")
Return svc Host

5. You are developing a Windows Communication Foundation (WCF) service.
One of the service operations contains the following code.
private static int counter = 0;
[OperationContract]
public void IncrementCount()
[
counter++;
}
You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time.
Which code segment should you use to set the service behavior?

A) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Hultiple)]
B) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerSession,
ConcurrencyMode = ConcurrencyMode.Single)]
C) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerCall,
ConcurrencyMode = ConcurrencyMode.Reentrant)]
D) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Single)]

Solutions: