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

1. You are developing a custom service host for a Windows Communication Foundation (WCF) service. The service host is named MovieServiceHost.
You need to deploy the service with the custom service host in Microsoft Internet Information Services (IIS) 7.0.
What should you do?

A) Create a factory for the custom service host. Name the factory MovieServiceHostFactory. In the .svc file, add the following line. <%3 ServiceHost Service="MovieServiceHostFactory" Language="VB"%>
B) Make sure that the service class has a default constructor. Add a public read-only property with the name ServiceHost that returns an instance of the MovieServiceHost class.
C) Decorate the custom service host class with the following line. <System.ServiceModel.Activation.ServiceActivationBuildProvider()>
D) Create a factory for the custom service host. Name the factory MovieServiceHostFactory. In the web.config file, add the following attribute to the <add> element within the <serviceActivations> element, factory="HovieServiceHostFactory"

2. A Windows Communication Foundation (WCF) client and service share the following service contract interface.
[ServiceContract]
public interface IContosoService {
[OperationContract]
void SavePerson(Person person);
}
They also use the following binding.
NetTcpBinding binding new NetTcpBinding { TransactionFlow = true };
The client calls the service with the following code
using (TransactionScope ts = new TransactionScope(TransactionScopeOption.Required))
{ IContosoService client = factoryCreateChannelO;
client SavePerson(person);
ConsoleWriteLine(
TransactionCurrentTransactionlnformation.
Distributedldentifier);
tsCompleteO;
}
The service has the following implementation for SavePerson
public void IContosoService SavePerson(Person person)
{ person.Saveo;
ConsoleWriteLine(TransactionCurrentTransactionlnformation.
Distributedidentifier);
}
The distributed identifiers do not match on the client and the server
You need to ensure that the client and server enlist in the same distributed transaction
What should you do?

A) Add the following attributes to the SavePerson operation on lContosoService
[TransactionFlow(TransactionFlowOption Mandatory)]
[OperationBehavior(TransactionScopeRequired true)]
B) Add the following attribute to the SavePerson operation on lContosoService [TransactionFlow(TransactionFlowOption Allowed)] Add the following attribute to the implementation of SavePerson. [OperationBehavior(TransactionScopeRequired true)]
C) Add the following attribute to the SavePerson operation on lContosoSernce [OperationBehavior(TransactionScopeRequired true)] Md the following attribute to the implementation of SavePerson. ITransactionFlow(TransactionFlowOptionAllowed)]
D) Add the following attributes to the SavePerson operation on IContosoService.
[OperationBehavior(TransactionScopeRequired = true)]
[TransactionFlow(TransactionFlowOption.
Mandatory)]

3. A Windows Communication Foundation (WCF) service implements the following contract. (Line numbers are included for reference only.)
01 <ServiceContract()>
02 Public Interface IDataAccessService
03
04 <OperationContract()>
05 Sub PutMessage(ByVal message As String)
06
07 <OperationContract()>
08 <FaultContract(GetType(TimeoutFaultException))>
09 <FaultContract(GetType(FaultException))>
10 Function SearchMessages(ByVal search As String) As String ()
11
12 End Interface
The implementation of the SearchMessages method throws TimeoutFaultException exceptions for database timeouts. The implementation of the SearchMessages method also throws an Exception for any other issue it encounters while processing the request. These exceptions are received on the client side as generic FaultException exceptions.
You need to implement the error handling code for SearchMessages and create a new channel on the client only if the channel faults.
What should you do?

A) Catch and handle both TimeoutFaultException and FaultException.
B) Catch and handle TimeoutFaultException. Catch FaultException and create a new channel.
C) Catch both TimeoutFaultException and FaultException. Create a new channel in both cases.
D) Catch and handle FaultException. Catch TimeoutFaultException and create a new channel.

4. You are creating a Windows Communication Foundation (WCF) service that accepts messages from clients when they are started. The message is defined as follows.
[MessageContract]
public class Agent
{
public string CodeName { get; set; }
public string SecretHandshake { get; set; }
}
You have the following requirements:
- The CodeName property must be sent in clear text. The service must be able to verify that the property value was not changed after being sent by the client. - The SecretHandshake property must not be sent in clear text and must be readable by the service.
What should you do?

A) Add a DataProtectionPermission attribute to the each property and set the ProtectData property to true.
B) Add an XmlText attribute to the CodeName property and set the DataType property to Signed. Add a PasswordPropertyText attribute to the SecretHandshake property and set its value to true.
C) Add an ImmutableObject attribute to the CodeName property and set its value property to true. Add a Browsable attribute to the SecretHandshake property and set its value to false.
D) Add a MessageBodyMember attribute to the CodeName property and set the ProtectionLevel to Sign. Add a MessageBodyMember attribute to the SecretHandshake property and set the ProtectionLevel to EncryptAndSign.

5. A Windows Communication Foundation (WCF) service interacts with the database of a workflow engine. Data access authorization is managed by the database, which raises security exceptions if a user is unauthorized to access it.
You need to ensure that the application transmits the exceptions raised by the database to the client that is calling the service.
Which behavior should you configure and apply to the service?

A) serviceSecurityAudit
B) routing
C) workflowUnhandledException
D) serviceDebug

Solutions: