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

1. --- -
You develop a Windows Communication Foundation (WCF) service. Many client applications will consume the service.
You have the following requirements:
You must enable client sessions on the service.
The service must support multi-threaded operations.
If a client application uses sessions, the lifetime of the service instance must be
scoped to the lifetime of the session.
If a client application does not use sessions, the lifetime of the service must be
scoped to the lifetime of a method cal
You need to configure the service.
What should you do? (Each correct answer presents part of the solution. Choose three.)

A) In the ServiceBehavior attribute, set the value of the InstanceContextMode property to InstanceContextMode. PerSession.
B) In the ServiceBehavior attribute, set the value of the SessionMode property to SessionMode.Allowed.
C) In the ServiceBehavior attribute, set the value of the ConcurrencyMode property to ConcurrencyMode.Multiple
D) In the ServiceContract attribute, set the value of the ConcurrencyMode property to ConcurrencyMode.Multiple
E) In the ServiceContract attribute, set the value of the SessionMode property to SessionMode.Allowed.
F) In the ServiceContract attribute, set the value of the InstanceContextMode property to InstanceContextMode.PerSession.

2. A Windows Communication Foundation (WCF) service implements the following contract.
[ServiceContract| public interface IHelloService { [OperationContract]
[VVebGet(UriTemplate =
"hello?namee{name}")] string SayHello(string name);
}
The implementation is as follows.
public class HelloService: IHelloService { public string SayHello(string name)
{ return "Hello ".+ name;
}
}
The senvice is self-hosted, and the hosting code is as follows.
WebServiceHost svcHost = CreateHoseO;
svcHost.OpenO;
Console. ReadLineO;
SrvHost.CloseO;
You need to implement CreateHost so that the senvice has a single endpoint hosted at
http://localhost:8000/HelloService which code segment should you use?

A) Ur baseAddress new Uri('http //Iocalhost 8000/");
WebServiceHost svc Host =
new WebServiceHost(new HelloService0, baseAddress),
svc Host.AddServiceEndpoint(typeof(IHelloService),
new WebHttpBinding(WebHttpSec urityMode None),
"HelloService");
retumn svc Host;
B) Ur baseAddress = new Urit'http:I/localhost:800O1");r
WebServiceHost svc Host new WebServiceHost(typeof(HelloService), baseAddress);
svcHostAddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode. None),
"HelloService"); return svc Host;
C) WebServiceHost svcHost = new Web Service Host(new HelloServiceO); svcHost
AddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode. None),
"http://Iocalhost: 8000/HelloService");
return svcHost
D) WebServiceHost svcHost new WebServiceHost(typeof(HelloService));
svcHost.AddServiceEndpoint(typeof(lHelloService),
new WebHttpBinding(WebHttpSecurityMode None),
"http://localhost:8000/HelloService");
return svcHost;

3. You are developing a Windows Communication Foundation (WCF) service that does not operate on a duplex channel.
You find that operations do not start until all previous operations have finished. The service hosting code contains the following lines.
var service = new WarehouseService();
var host = new ServiceHost(service);
You need to ensure that new operations do not wait for previous operations to finish.
Which attribute should you use to decorate the service?

A) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Single) ]
B) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Reentrant) ]
C) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Multiple)]
D) [CallbackBehavior(
ConcurrencyMode = ConcurrencyMode.Multiple) ]

4. A Windows Communication Foundation (WCF) service exposes two operations: OpA and OpB OpA needs to execute under the client's identity, and OpB needs to execute under the service's identity.
You need to configure the service to run the operations under the correct identity
What should you do?

A) Set the ImpersonateCallerForAllOperations property of the service's
ServiceAuthorizationBehavior to false.
Apply an OperationBehavior attribute to OpA and set the Impersonation property to
lmpersonationOption.Required.
Apply an OperationBehavior attribute to OpB and set the Impersonation property to
ImpersonationOption.Allowed.
B) Set the ImpersonateCallerForAllOperations property of the service's
ServiceAuthorizationBehavior to false.
Apply an OperationBehavior attribute to OpA and set the Impersonation property to
ImpersonationOptionAllowed.
Apply an OperationBehavior attribute to OpB and set the Impersonation property to
ImpersonationOption
NotAllowed
C) Set the ImpersonateCallerForAllOperations property of the service's
ServiceAuthorizationBehavior to true.
Apply an OperationBehavior attribute to OpA and set the Impersonation property to
ImpersonationOption.Allowed
Apply an OperationBehavior attribute to OpB and set the Impersonation property to
ImpersonationOption
NotAllowed
D) Set the ImpersonateCallerForAllOperations property of the service's ServiceAuthorizationBehavior to true. Apply an OperationBehavior attribute to OpA and set the Impersonation property to ImpersonationOption Required Apply an OperationBehavior attribute to OpB and set the Impersonation property to ImpersonationOptionAulowed.

5. You are moving a Windows Communication Foundation (WCF) service into production. You need to be able to monitor the health of the service.
You only want to enable all performance counter instances exposed by the ServiceModelService 4.0.0.0 counter group.
Which element should you add to the system.serviceModel section in the application configuration file?

A) <diagnostics performanceCounters="All" />
B) <diagnostics wmiProviderEnabled="true" />
C) <diagnostics performanceCounters="ServiceOnly" />
D) <diagnostics wmiProviderEnabled="true" performanceCounters="Off" />

Solutions: