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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 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.
• B. 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.
• 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 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.

A WCF service code is implemented as follows. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 <ServiceBehavior( 03 InstanceContextMode:=InstanceContextMode.Single)> 04 Public Class CalculatorService 05 06 <OperationContract()> 07 Public Function Calculate(ByVal op1 As Double, 08 ByVal op As String, ByVal op2 As Double) As Double & 24 End Function 25 26 End Class
You need to decrease the response time of the service.
What are two possible ways to achieve this goal (Each correct answer presents a complete solution? Choose two.)

• A. Require the clients use threads, the Parallel Task Library, or other mechanism to issue service calls in parallel.
• B. Require the clients to use async operations when calling the service.
• C. Change the service behavior to the following. <ServiceBehavior( InstanceContextMode:=InstanceContextMode.Single, ConcurrencyMode:=ConcurrencyMode.Multiple)>
• D. Change the service behavior to the following. <ServiceBehavior(InstanceContextMode:=InstanceContextMode.PerCall)>

You create a Windows Communication Foundation (WCF) sen/ice. It is deployed on Microsoft Internet Information Services (IIS) with an application pool running as Network Service. You enable WMI tracing before launching the service. Your IT support staff adds WMI data collection through ASP.NET WMI tracing.
You need to restrict the collection of WMI data to a privileged account.
What should you do in WMI Control in the Computer Management console?

• A. Select the Root\ServiceModel namespace.
  Remove Enable account permission for the Network Service account.
  Add a custom user and grant that user Enable account permission.
• B. Select the Root\Security namespace.
  Remove Enable account permission for the Local System account.
• C. Select the Root\aspnet namespace.
  Remove Enable account permission for the Local System account.
  Add a custom user and grant that user Enable account permission.
• D. Select the Root\aspnet namespace.
  Remove Enable account permission for the Network Service account.
  Add a custom user and grant that user Enable account permission.

You have a self-hosted Windows Communication Foundation (WCF) service.
You need to configure the service to provide an X.509 certificate during authentication
What should you use to configure the service?

• A. the TrustedStoreLocation property of the X5O9CertificateRecipientServiceCredential class
• B. the SetCertificate method of the X509CertificatelnitiatorServiceCredential class
• C. the Certificate property of the X509CertificatelnitiatorServiceCredential class
• D. the SetCertificate method of the X5O9CertificateRecipientServiceCredential class

You develop a Windows Communication Foundation (WCF) service to generate reports. Client applications call the service to initiate report generation but do not wait for the reports to be generated. The service does not provide any status to the client applications.
The service class is defined as follows. (Line numbers are included for reference only.)

You need to ensure that client applications can initiate reports without waiting for status.
Which two actions should you perform (Each correct answer presents part of the solution. Choose two.)

• A. At line 05, change the GenerateReports method from private to public.
• B. Insert the following code at line 04. [OperationContract(IsOneWay=true)]
• C. Remove line 08. At line 05, change the return type of GenerateReports method to void.
• D. Insert the following code at line 04. [OperationContract(AsyncPattern=false)]