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

1. You are developing a Windows Communication Foundation (WCF) service. One of the service operations contains the following code.

You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time.
Which code segment should you use to set the service behavior?

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

2. You are developing a client application that consumes a Windows Communication Foundation (WCF) service. The operation contract is as follows.
[OperationContract]
[FaultContract(typeof(SalesFault))]
string GetSales(string saleld);
The service configuration file contains the following line in the serviceBehaviors section.
<behavior>
<serviceDebug inc1udeExceptionDetoillnFauIts-"True"/>
</behavior>
A divide-by-zero exception is not being handled by the service.
You need to ensure that the exception is caught in the client application.
Which type of exception should the client catch?

A) FaultException
B) FaultException<SalesFault>
C) TimeoutException
D) DivideByZeroException

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 {
01 [OperationContract]
05 void PutMessage(string message);
07 [OperationContract]
08 [FaultContract(typeof(TimeoutFaultException)) ]
09 [FaultContract(typeof(FaultException) ) ]
10 stringf] SearchMessages(string search);
11 }
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 both TimeoutFaultException and FaultException. Create a new channel in both cases.
B) Catch and handle TimeoutFaultException.Catch FaultException and create a new channel.
C) Catch and handle both TimeoutFaultException and FaultException
D) Catch and handle FaultException.Catch TimeoutFaultException and create a new channel.

4. Your Windows Communication Foundation (WCF) client application uses HTTP to communicate with the service.
You need to enable message logging and include all security information such as tokens and nonces in logged messages.
What should you do?

A) In the machine configuration file, add the following XML segment to the
system.serviceModel configuration section.
<machineSettings enableLoggingKnownPii="true" />
In the application configuration file, add the logKnownPii attribute to the message logging
diagnostics source and set the value of the attribute to true. In the application configuration
file, add the following XML segment to the system.serviceModel configuration section
group.
<diagnostics>
<messageLogging logMessagesAtTransportLevel="true"/>
</diagnostics>
B) In the machine configuration file, add the following XML segment to the
system.serviceModel configuration section.
<machineSettings enableLoggingKnownPii="true" />
Generate the ContosoService class using the Add Service Reference wizard.
Add the following code segment.
ContosoService client = new ContosoService();
client.Endpoint.Behaviors.Add(new CallbackDebugBehavior(true));
C) In the application configuration file, add the following XML segment to the
system.serviceModel configuration section group.
<diagnostics>
<messageLogging logMessagesAtTransportLevel="true"
logEntireMessage="true" />
</diagnostics>
D) In the application configuration file, add the logKnownPii attribute to the message
logging diagnostics source and set the value of the attribute to true.
Generate the ContosoService class using the Add Service Reference wizard. Add a
reference to System.ServiceModel.Routing.dll.
Add the following code segment.
ContosoService client = new ContosoService();
SoapProcessingBehavior behavior = new SoapProcessingBehavior();
behavior.ProcessMessages = true;
client.Endpoint.Behaviors.Add(behavior);

5. You are developing a Windows Communication Foundation (WCF) service. You enable message logging, trace listeners, activity propagation, and tracing on the trace sources.
You have the following code segment in the client application. (Line numbers are included for reference only.)

You encounter errors when your client application consumes the service.
You need to ensure that your client application can correlate tracing information with the
service.
Which code segment should you add at line 04?

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

Solutions: