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

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

2. You are developing a client that sends several types of SOAP messages to a Windows Communication Foundation (WCF) service method named PostData.
PostData is currently defined as follows.
[OperationContract]
void PostData(Order data);
You need to modify PostData so that it can receive any SOAP message.
Which code segment should you use?

A) [OperationContract] void PostData(Message data);
B) [OperationContract(IsOneWay = true, Action = "*", ReplyAction = "*")] void PostData(Order data);
C) [OperationContract] void PostData(BodyWriter data);
D) [OperationContract(IsOneWay = true, Action = "*", ReplyAction = "*")] void PostData(BodyWriter data);

3. A Windows Communication Foundation (WCF) service is self-hosted in a console application.
The service implements the ITimeService service interface in the TimeService class.
You need to configure the service endpoint for HTTP communication.
How should you define the service and endpoint tags?

A) Define the service tag as follows.
<service name="TimeService">
Define the endpoint tag as follows.
<endpoint address="http://localhost:8080/TimeService"
binding="wsHttpBinding"
contract="ITimeService"/>
B) Define the service tag as follows.
<service name="TimeService">
Define the endpoint tag as follows.
< endpoint kind="TimeService"
address="http://localhost:8080/TimeService"
binding="wsHttpBinding"
contract="ITimeService"/>
C) Define the service tag as follows.
<service name="ITimeService">
Define the endpoint tag as follows.
< endpoint name="TimeService"
ddress="http://localhost:8080/TimeService"
binding="wsHttpBinding"
contract="ITimeService"/>
D) Define the service tag as follows.
<service name="ITimeService">
Define the endpoint tag as follows.
< endpoint kind ="TimeService"
address="http://localhost:8080/TimeService"
binding="wsHttpBinding"
contract="ITimeService"/>

4. You are developing a Windows Communication Foundation (WCF) service.
The service operation takes a customer number as the only argument and returns information about the customer.
The service requires a security token in the header of the message.
You need to create a message contract for the service.
Which code segment should you use?

A) [ServiceContract]
public interface IService
{
[OperationContract]
CustomerInformation GetCustomerInformation(Header header,
int customerNumber);
}
[DataContract]
public class CustomerInformation
{
.......
}
[MessageContract]
public class Header { [MessageHeader] public string SecurityTag;
}
B) [ServiceContract]
public interface IService
{ [OperationContract]
CustomerInformation GetCustomerInformation(Header header,
int customerNumber);
} [MessageContract] public class CustomerInformation { } [MessageContract] public class
Header { [MessageHeader] public string SecurityTag; }
C) [ServiceContract]
public interface IService {
[OperationContract]
CustomerInformation GetCustomerInformation( CustomerNumber request);
}
[DataContract]
public class CustomerInformation { } [MessageContract] public class CustomerNumber {
[MessageHeader]
public string SecurityTag; [MessageBodyMember] public int CustomerNumberElement; }
D) [ServiceContract]
public interface IService
{
[OperationContract]
CustomerInformation GetCustomerInformation(
CustomerNumber request);
}
[MessageContract]
public class CustomerInformation
{
......
}
[MessageContract] public class CustomerNumber
{
[MessageHeader]
public string SecurityTag;
[MessageBodyMember]
public int CustomerNumberElement;
}

5. You are developing a Windows Communication Foundation (WCF) client application.
You instantiate a client class that inherits from ClientBase. The client instance must always be shut down in such a way that tt can free up any resources it is referencing. You need to ensure that all exceptions are caught and the instance is always properly shut
down.
Which code segment should you use?

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

Solutions: