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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 the following service contract.
<ServiceContract()>
Public Interface IOrderProcessing
<OperationContract()>
Sub ApproveOrder(ByVal id As Integer)
End Interface
You need to ensure that only users with the Manager role can call the ApproveOrder method. What should you do?

A) In the method body, create a new instance of WindowsClaimSet. Use the FindClaims method to locate a claimType named Role with a right named Manager.
B) Add a PrincipalPermission attribute to the method and set the Roles property to Manager.
C) In the method body, check the Rights.PossessProperty property to see if it contains Manager.
D) Add a SecurityPermission attribute to the method and set the SecurityAction to Demand.

2. You are implementing a Windows Communication Foundation (WCF) client application that consumes the ICatalog and lCatalog2 service interfaces
You need to ensure that the client discovers services implementing these interfaces
The services may already be online or may come online within a 30 second time limit
How should you use WCF Discovery to accomplish this?

A) Create one FindCriteria object for each interface and set the Duration of each
FindCriteria to two seconds.
Create a loop that calls the Find method of the DiscoveryClient class to search for the
services.
Within each loop iteration, call the Find method of the DiscoveryClient class once for each
of the FindCriteria objects Run the loop until a service is found or 30 seconds pass.
B) Create one FindCriteria object for each interface and set the Duration of each
FindCriteria to 30 seconds Call the FindAsync method of the DiscoveryClient class twice,
one time for each of the FindCriteria objects, to search for the services.
C) Create a single FindCritera object and add both interfaces to the ContractTypeNames
collection. Set the Duration to 30 seconds and use the FindAsync method of the
DiscoveryClient class to search for the services.
D) Create a single FindCriteria object and add both interfaces to its ContractTypeNames
collection. Set the criteria's Duration to two seconds.
Create a loop that calls the Find method of the DiscoveryClient class to search for the
services.
Within each loop iteration, call the Find method of the DiscoveryClient class to search for
the services Run the loop until a service is found or 30 seconds pass.

3. You develop a Windows Communication Foundation (WCF) service that uses basic authentication for client credentials. This service is currently configured to use message security.
The service is hosted on a server in workgroup mode.
Users report that their passwords are stolen when they use public computers.
You need to ensure that messages are secure and users are authenticated.
You prevent the service from being called over HTTP through Microsoft Internet Information Services (IIS) configuration. What should you do next?

A) Use the transportWithMessageCredential security mode and specify None for the transport client credential type.
B) Use the transportWithMessageCredential security mode and specify Basic for the transport client credential type.
C) Use the message security mode and specify Basic for the transport client credential type.
D) Use the transport security mode and specify None for transport client credential type.

4. You are developing a Windows Communication Foundation (WCF) service that returns location information for authorized law enforcement agencies. The service contract is as follows.
[ServiceContract]
public interface IMappingService
{
[OperationContract]
long[] GetLocationCoordinates(String cityNaroe);
[OperationContract]
long[] GetLocationOfCitizen(String ssn) ;
}
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) 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.
B) Create a GenericPrincipal specifying Thread.CurrentPrincipal.Identity as the IldentityParameter and LawEnforcement as the only value for the Roles parameter.
C) Use the CurrentPrincipal property of the thread. Call the IsInRole method specifying LawEnforcement as a parameter.
D) 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.

5. Windows Communication Foundation (WCF) service will be hosted in Microsoft Intemnet Information Services (uS).
You create a new application in uS to host this service and copy the service DLL to the bin directory of the application.
You need to complete the deployment of this service to uS. What should you do next?

A) Create a .svc file and add a @Register directive to this file. Copy the file to the bin directory of the application.
B) Create a svc file and add a @ServiceHost directive to this file Copy the file to the root of the application directory.
C) Create an asmx file and add a @ServiceHost directive to this file. Copy the file to the root of the application directory.
D) Create an .asmx file and add a @Register directive to this file. Copy the file to the bin directory of the application.

Solutions: