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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 that employees use to access bonus information. You define the following service contract. (Line numbers are included for reference only.)
01 <ServiceContract(SessionMode:=SessionMode.Required)> 02 Public Interface IFinancialService 03 04 <OperationContract()> 05 Function Login( ByVal employeeID As Integer, ByVal passwordHash As String) As String 06 07 <OperationContract()> 08 Function GetBonus(ByVal month As Integer) As Double 09 10 <OperationContract (IsTerminating:=True)> 11 Sub Logout() 12 13 End Interface
Client applications can invoke methods without logging in.
You need to ensure that the client applications invoke Login before invoking any other method.
You also need to ensure that client applications cannot consume the service after invoking Logout.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Replace line 04 with the following code. <OperationContract(IsInitiating:=False)>
B) Replace line 04 with the following code. <OperationContract(IsInitiating:=True, IsTerminating:=True)>
C) Replace line 07 with the following code. <OperationContract(IsInitiating:=False)>
D) Replace line 10 with the following code. <OperationContract(IsInitiating:=False, IsTerminating:=True)>

2. You are creating a Windows Communication Foundation (WCF) service that implements operations in a RESTful manner. You need to add a delete operation
You implement the delete method as follows. string oid Deleteltems(string id);
You need to configi.re WCF to ci this method when the client calls the service with the HTTP DRETE opera on
What should you do?

A) Add the Weblnvoke(UriTemplate = "/Items/(idy, Method="DELETE") attribute to the operation
B) Replace the sting parameter with a RemovedActivityAction parameter
C) Replace the return type with RemovedActivityktion.
D) Add the HttpDelete tribute to the operation

3. You are developing a Windows Communication Foundation (WCF) service. One of the parameters used with the service operations is a security token. The security token is not sensitive. The monitoring software tracks security tokens and can read tokens in clear text only.
The company security policy requires that you validate all clear text data passed over the corporate network.
You need to ensure that the service verifies that the security token is not changed during transit.
What should you do?

A) For all the security-sensitive members, set the ProtectionLevel parameter of the MessageBodyMember or MessageHeader attribute to Sign.
B) Implement IEndpointldentityProvider in the message contract class.
C) For all the security-sensitive members, set the ProtectionLevel parameter of the MessageBodyMember or MessageHeader attribute to EncryptAndSign.
D) Implement ISecureConversationSession in the message contract class.

4. You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data. The service contract is defined as follows. (Line numbers are included for reference only.)

You need to ensure that the service is invoked within a transaction.
What should you do?

A) Replace line 01 with the following code.
[ServiceContract( SessionMode = SessionMode.Required)]
B) Insert the following code at line 08.
[ServiceBehavior(
ReleaseServiceInstanceOnTransactionComplete = false)]
C) Insert the following code at line 08.
[ServiceBehavior(
TransactionAutoCompleteOnSessionClose = false)]
D) Replace line 01 with the following code.
[ServiceContract(
SessionMode = SessionMode.NotAllowed)]

5. You are developing a Windows Communication Foundation (WCF) service that allows customers to update financial data. The client applications call the service in a transaction. The service contract is defined as follows. (Line numbers are included for reference only.)
01 <ServiceContract()>
02 Public Interface IDatallpdate
03
04 <OperationContract()>
05 <TransactionFlow(TransactionFlowOption.Handatocy)>
06 Sub Update (ByVal accountNumber As String,
ByVal amount As Double)
07
08 End Interface
09
10 Class UpdateService
11 Implements IDataUpdate
12
13 <OperationBehavior(
TransactionScopeRequired:=True, TransactionAutoComplete:=True)>
14 Public Sub Update(ByVal accountNumber As String,
ByVal amount As Double)
Implements IDataUpdate.Update IS
16 Try
17 18 Catch ex As Exception
19 WriteErrorLog(ex) 20
21 End Try
22
23 End Sub
24
25 End Class
Customers report that the transaction completes successfully even if the Update method throws an exception.
You need to ensure that the transaction is aborted if the Update method is not successful.
What should you do?

A) Insert the following line at line 09. <ServiceBehavior( TransacCionAucoCompleteOnSesslonClose:"True) >
B) Insert the following line at line 09. <ServiceBehavlor( TransactionAutoCoropleteOnSessionClose:"False) >
C) Replace line 13 with the following line. <OperationBehavior( TransactionScopeRequired:MTrue, TransactionAutoComplece:"False)>
D) insert the following line at line 20. Throw

Solutions: