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

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

2. You are integrating a Windows Communication Foundation (WCF) service within an enterprise-wide Service
Oriented Architecture (SQA)
Your service has the following service contract.
[ServiceContract]
public class CreditCardConfirmationService { [OperationContracti public Boolean ConfirmCreditCard(string cc Number double orderAmount, nmt orderNumber) { )
)
You need to allow the code in the ConfirmCreditCard method to participate automatically in existing transactions. If there is no existing transaction, a new transaction must be created automatically.
What should you do?

A) Inside the ConfirmCreditCard method, surround the code that must participate in the transaction with a using(new TransactionScopeO) block
B) Inside the ConfirmCreditCard method, surround the code that must participate in the transaction with a using(new CommittableTransactionO) block.
C) Add an [OperationBehavior(TransactionAutoComplete true)J attribute to the ConfirmCreditCard method.
D) Add an [OperationBehavior(TransactionScopeRequired true)] attribute to the ConfirmCreditCard method.

3. You are creating a Windows Communication Foundation (WCF) service that accepts claims-based tokens.
You need to ensure that the service can use claims from trading partners even though there are variations on naming for the same elements.
Which two actions should you perform? (Each correct answer presents part of the solution Choose two.)

A) Register an Authorization Policy that maps external claims to an internal Claim Set.
B) Register a custom Service Authorization Manager that implements Check Access In this method, use System. Convert. Change Type to transform the incoming claim set to a Windows Claim Set type.
C) Within the operation, verify the presence of the required claims in the current Authorization Context
D) Apply a Principal Permission attribute on the operation with the required claims listed in the Roles property.

4. You are developing a Windows Communication Foundation (WCF) service that contains the following code segment.
[ServiceContract ] public interface ICustomerService { & }
public class CustomerService : ICustomerService { & }
The service is self-hosted in a console application. Older client applications access the service at http://contoso.com:8080/CustomerService/V1. Newer client applications access the service at http://contoso.com:8080/CustomerService/V2.
You need to ensure that any client application can access the service at either address.
Which code segment should you use?

A) Uri serviceAddress1 =
new Uri("http://contoso.com:8080/CustomerService/V1");
Uri serviceAddress2 =
new Uri("http://contoso.com:8080/CustomerService/V2");
ServiceHost host =
new ServiceHost(typeof(ICustomerService),
new Uri[] { serviceAddress1, serviceAddress2 });
B) Uri serviceAddress1 =
new Uri("http://contoso.com:8080/CustomerService/V1");
Uri serviceAddress2 =
new Uri("http://contoso.com:8080/CustomerService/V2");
ServiceHost host =
new ServiceHost(typeof(CustomerService),
new Uri[] { serviceAddress1, serviceAddress2 });
C) Uri serviceAddress =
new Uri("http://contoso.com:8080/");
ServiceHost host =
new ServiceHost(typeof(ICustomerService),
new Uri[] { serviceAddress });
host.AddServiceEndpoint(typeof(CustomerService),
new BasicHttpBinding(), "CustomerService/V1");
host.AddServiceEndpoint(typeof(CustomerService),
new BasicHttpBinding(), "CustomerService/V2");
D) Uri serviceAddress =
new Uri("http://contoso.com:8080/");
ServiceHost host =
new ServiceHost(typeof(CustomerService),
new Uri[] { serviceAddress });
host.AddServiceEndpoint(typeof(ICustomerService),
new BasicHttpBinding(), "CustomerService/V1");
host.AddServiceEndpoint(typeof(ICustomerService),
new BasicHttpBinding(), "CustomerService/V2");

5. --- -
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 SessionMode property to SessionMode.Allowed.
B) In the ServiceBehavior attribute, set the value of the ConcurrencyMode property to ConcurrencyMode.Multiple
C) In the ServiceContract attribute, set the value of the InstanceContextMode property to InstanceContextMode.PerSession.
D) In the ServiceBehavior attribute, set the value of the InstanceContextMode property to InstanceContextMode. PerSession.
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 ConcurrencyMode property to ConcurrencyMode.Multiple

Solutions: