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

1. A Windows Communication Foundation (WCF) service handles online order processing for
your company.
You discover that many requests are being made with invalid account numbers.
You create a class named AccountNumberValidator that has a method named Validate.
Before the message is processed, you need to validate account numbers with AccountNumberValidator and reject messages with invalid account numbers.
You create a new class that implements the IParameterInspector interface.
Which code segment should you use in this class?

A) public void AfterCall(string operationName,
object[] outputs,
object returnValue,
object correlationState)
{
return;
}
public
object BeforeCall(string operationName, object[] inputs) {
string accountNumber = GetAccountNumber(inputs);
var validator = new AccountNumberValidator();
if (!validator.Validate(accountNumber))
{
return new FaultException();
}
}
B) public void AfterCall(string operationName,
object[] outputs,
object returnValue,
object correlationState)
{
return;
}
public object BeforeCall(string operationName,
object[] inputs)
{
string accountNumber = GetAccountNumber(inputs);
var validator = new AccountNumberValidator();
if (!validator.Validate(accountNumber))
{
throw new FaultException();
}
return null;}
C) public void AfterCall(string operationName,
object[] outputs,
object returnValue,
object correlationState)
{
string accountNumber = GetAccountNumber(outputs);
var validator = new AccountNumberValidator();
if(!validator.Validate(accountNumber)
}
{
returnValue = new FaultException();
}
}
public object BeforeCall(string operationName,
object[] inputs)
{ return null; }
D) public void AfterCall(string operationName, object[] outputs,
object returnValue,
object correlationState)
{
string accountNumber = GetAccountNumber(outputs);
var validator = new AccountNumberValidator();
if(!validator.Validate(accountNumber))
{
throw new FaultException();
}
}
public object BeforeCall(string operationName, object[] inputs)
{
return null;
}

2. You have a Windows Communication Foundation (WCF) service.
The service has issues with performance when it receives messages on a specific endpoint. The service must collect the minimum number of performance counters to diagnose the message issues.
You need to configure the service.
In the web.config file for the service, what should you do?

A) In the service configuration diagnostics section, set the value of the performancCounters property to All.
B) In the service configuration diagnostics section, set the value of the performanceCounters property to ServiceOnly.
C) Enable the Windows Management Instrumentation (WMI) provider.
D) Enable message logging for the endpoint.

3. You are developing a Windows Communication Foundation (WCF) service. The service needs to access out-of-process resources.
You need to ensure that the service accesses these resources on behalf of the originating caller.
What should you do?

A) Set the value of ServiceSecurityContext.Current.WindowsIdentity.ImpersonationLevel to TokenImpersonationLevel.Impersonation.
B) Set the value of ServiceSecurityContext.Current.WindowsIdentity.ImpersonationLevel to TokenImpersonationLevel.Delegation.
C) Set the PrincipalPermissionAttribute on the service contract and update the binding attribute in the endpoint element of the configuration file to wsHttpBinding.
D) Set the PrincipalPermissionAttribute on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to wsHttpBinding.

4. A Windows Communication Foundation (WCF) client uses the following service contract. (Line numbers are included for reference only.)
01 [ServiceContract] 02 public interface IService 03 ( 04 [OperationContractj 05 string Operation1O; 06 [OperationContract] 07 string Operation2(), 08)
You need to ensure that all calls to Operation 1 and Operation2 from the client are encrypted and signed.
What should you do?

A) Add a SecunitySafeCriticalAttribute for each operation.
B) Set the ProtectionLevel property in line 01 to EncryptAndSign.
C) Set the ProtectionLevel property in line 04 and line 06 to Sign.
D) Add a SecurityCriticalAttribute ror each operation.

5. You are developing a Windows Communication Foundation (WCF) service to replace an existing A5MX Web service.
The WCF service contains the following code segment. (Line numbers are included for reference only.)

The existing Web service returns the EmployeeID as an attribute of the EmployeeInfo element in the response XML.
You need to ensure that applications can consume the service without code changes in the client.

A) Option A
B) Option B
C) Option D
D) Option C

Solutions: