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

1. You are adding a Windows Communication Foundation (WCF) service to an existing application. The application is configured as follows. (Line numbers are included for reference only.)
01 <configuration>
02 <system.serviceModel>
03 <services>
04 <service name="Contoso.Sales.StockService"
behaviorConfiguration="MetadataBehavior">
06 <host>
07 <baseAddresses>
08 <add
baseAddress="http://contoso.com:8080/StockService" />
09 </baseAddresses>
10 </host>
11 </service>
12 </services>
13 <behaviors>
14 <serviceBehaviors>
15 <behavior name="MetadataBehavior">
16 </behavior>
17 </serviceBehaviors>
18 </behaviors>
You need to configure the service to publish the service metadata.
Which two actions should you perform?
(Each correct answer presents part of the solution. Choose two.)

A) Add the following XML segment between lines 10 and 11.
<endpoint address=""
binding="mexHttpBinding"
contract="IMetadataExchange" />
B) Add the following XML segment between lines 10 and 11.
<endpoint address=""
binding="basicHttpBinding"
contract="IMetadataExchange" />
C) Add the following XML segment between lines15 and 16.
<serviceDiscovery>
<announcementEndpoints>
<endpoint address=""/>
</announcementEndpoints>
</serviceDiscovery>
D) Add the following XML segment between lines 15 and 16
<serviceMetadata httpGetEnabled="true"/>

2. A Windows Communication Foundation (WCF) service is self-hosted in a console application. The service implements the IDataAccess contract, which is defined in the
MyApplication namespace.
The service is implemented in a class named DataAccessService, which implements the
IDataAccess interface and also is defined in the MyApplication namespace.
The hosting code is as follows. (Line numbers are included for reference only.)

You need to create a ServiceHost instance and assign it to the host variable. You also need to instantiate the service host.
Which line of code should you insert at line 04?

A) host = New ServiceHost(GetType(IDataAccess))
B) host = New ServiceHost("MyApplication.IDataAccess")
C) host = New ServiceHost(GetType(DataAccessService))
D) host = New ServiceHost("MyApplication.DataAccessService")

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

4. You are creating a Windows Communication Foundation (WCF) service. You do not want to expose the internal implementation at the service layer. You need to expose the following class as a service named Arithmetic with an operation named Sum.
public class Calculator
{ public int Add(int x, int y)
{
}
}
Which code segment should you use?

A) [ServiceContract(Name="Arithmetic")]
public class Calculator
{ [OperationContract(Name="Sum")]
public int Add(int x, int y)
{
....
}
}
B) [ServiceContract(Namespace="Arithmetic")]
public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
.....
}
}
C) [ServiceContract(Name="Arithmetic")] public class Calculator
{
[OperationContract(ReplyAction="Sum")]
public int Add(int x, int y)
{
.....
}
}
D) [ServiceContract(ConfigurationName="Arithmetic")] public class Calculator
{
[OperationContract(Action="Sum")]
public int Add(int x, int y)
{
.....
}
}

5. You are modifying a Windows Communication Foundation (WCF) service that issues security tokens. The service is accessible through the named pipe protocol. No endpoints are added in the service code. The configuration file for the service is as follows. (Line numbers are included for reference only.)

You need to ensure that new and existing client applications can access the service through HTTP and named pipes.
What should you do?

A) Insert the following line at line 08. < add baseAddress="net.tcp://www.contoso.com:8090" />
B) Insert the following line at line 05. <endpoint address="http://www.contoso.com" binding="basicHttpBinding" contract="Contoso.TokenService" />
C) Insert the following line at line 08. <add baseAddress="http://www.contoso.com" />
D) Insert the following line at line 05. <endpoint address=http://www.contoso.com binding="wsHttpBinding" contract="Contoso.TokenService" />

Solutions: