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

1. 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.
Sub DeleteItems (ByVol id As String)
You need to configure WCF to call this method when the client calls the service with the HTTP DELETE operation.
What should you do?

A) Change the Sub statement to Function and specify RemovedActivityAction as the return type.
B) Add the HttpDelete attribute to the operation.
C) Replace the string parameter with a RemovedActivityAction parameter.
D) Add the WebInvoke(UriTemplate: = "/Items/{id>", Method: = "DELETE") attribute to the operation.

2. You are developing a Windows Communication Foundation (WCF) service that returns location information for authorized law enforcement agencies. The service contract is as follows.

Users are authenticated and impersonated. The system uses ASP.NET roles. The members of law enforcement are members of the LawEnforcement role.
You need to ensure that only members of the LawEnforcement role can call these methods.
What are two possible ways to achieve this goal (Each correct answer presents a complete solution? Choose two.)

A) Add a PrincipalPermissionAttribute to each method that should be available only to members of law enforcement. Set its SecurityAction to Demand and set the role equal to LawEnforcement.
B) Use the CurrentPrincipal property of the thread. Call the IsInRole method specifying LawEnforcement as a parameter.
C) At the beginning of each method, enumerate each ClaimSet in a new WindowsClaimSet. Use the FindClaims method to locate a claim type named Role with a right named LawEnforcement.
D) Create a GenericPrincipal specifying Thread.CurrentPrincipal.Identity as the IIdentityParameter and LawEnforcement as the only value for the Roles parameter.

3. 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="wsHttpBinding" 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="basicHttpBinding" contract="Contoso.TokenService" />

4. You are creating a Windows Communication Foundation (WCF) service. The service endpoints change frequently.
On the service, you add a new ServiceDiscoveryBehavior to the Behaviors collection of the ServiceHost Description property.
You need to ensure that client applications can communicate with the service and discover changes to the service endpoints.
What should you do?

A) Use the DiscoveryProxy class and the EndpointDiscoveryMetadata class to set up the binding in the client application.
B) Use the FindCriteria class and the UdpDiscoveryEndpoint class to set up the binding in the client application.
C) Add a new ServiceDiscoveryBehavior to the Behaviors collection in the client application.
D) Add a new AnnouncementClient to the Behaviors collection in the client application.

5. 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(
CustomerNumber request);
}
[MessageContract]
public class CustomerInformation
{
......
}
[MessageContract] public class CustomerNumber
{
[MessageHeader]
public string SecurityTag;
[MessageBodyMember]
public int CustomerNumberElement;
}
B) [ServiceContract]
public interface IService
{
[OperationContract]
CustomerInformation GetCustomerInformation(Header header,
int customerNumber);
}
[DataContract]
public class CustomerInformation
{
.......
}
[MessageContract]
public class Header { [MessageHeader] public string SecurityTag;
}
C) [ServiceContract]
public interface IService
{ [OperationContract]
CustomerInformation GetCustomerInformation(Header header,
int customerNumber);
} [MessageContract] public class CustomerInformation { } [MessageContract] public class
Header { [MessageHeader] public string SecurityTag; }
D) [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; }

Solutions: