You have a Windows Communication Foundation (WCF) service that uses a multicast protocol as a custom transport. The service implements the channel framework.
You need to choose a message exchange pattern for the transport.
What should you use?

• A. Half-Duplex by using the IRequestChannel interface for clients and the IReplyChannel interface for the service.
• B. Duplex by using the IDuplexChannel interface for both clients and the service.
• C. Datagram by using the IOutputChannel interface for clients and the IInputChannel interface for the service.
• D. Request-Response by using the IRequestChannel interface for clients and the IReplyChannel interface for the service.

You are developing a Windows Communication Foundation (WCF) service to provide an in-memory cache. The following code is part of your solution. (Line numbers are included for reference only.)
01 02 Public Interface IlnMemoryCacheService 03 04 <OperationContract()> 05 Function GetCachedItem( ByVal key As String) As String 06 07 <OperationContract() > 08 Sub CacheItem( ByVal key As String, ByVal item As String) 09 10 End Interface 11 12 <ServiceBehavior( InstanceContextMode:=InstanceContextHode.Single)> 13 Public Class CacheService 14 Implements IlnHemoryCacheService 15 16 Dim cache As Hashtatale - New Hashtable)> 17 18 Public Function GetCachedItem( ByVal key As String) As String mplements IInHemoryCacheService.GetCachedltem 19 20 Return cache (key) .ToStrlng() 21 22 End Function
23 24 Public Sub Cacheltem( ByVal key As String, ByVal item As String) Implements ilnMemoryCacheService.Cacheltem Then 25 26 If (cache.Contains(key) 27 cache.Remove(key) 28 End If 29 30 cache.Add(key, item) 31 32 End Sub
34 End Class
Users report that the cache is getting updated with cache changes of other users. You need to ensure that each user's cache is maintained and isolated from other users.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

• A. Insert the following code at line 01. <ServiceContract(SessionMode:=SessionHode.NotAllowed)>
• B. At line 12, replace InstanceContextHode.Single with InstanceContextHode.PerSession.
• C. At line 12, replace InstanceContextHode.Single with InstanceContextHode.PerCall.
• D. Insert the following code at line 01. <ServiceContract(SessionHode:=SessionHode.Required)>

DRAG DROP
You develop a Windows Communication Foundation (WCF) service that is hosted within a console application. The service implements the IRegistrationService interface in a class named RegistrationService. The service uses the following endpoint URL: http://localhost:8080/registrationservice/basic
You need to configure the console application to host the service.
How should you complete the relevant code? (To answer, drag the appropriate code segment to the correct location in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

A Windows Communication Foundation (WC9 service implements a contract with one-way and requestreply operations.
The service is exposed over a TCP transport Clients use a router to communicate with the service. The router is impemented as follows.
(Line numbers are included for reference only.)
01 Dim host As ServiceHost = 02 New ServiceHost(GetType(RoutingService)) 03 hostAddServiceEndpoint(
04 GetType(lSimplexDatagramRouter),
05 New NetTcpBinding0, "net.tcp://localhostlRouter"
06)
07 Dim lep As List(Of ServiceEndpoint) =
08 New List(Of SenviceEndpointx)
09 lepAdd(
10 New ServiceEndpoint(
11 CortractDescription.GetContract(
12 GetType(lSimplexDatagramRouter)
13)1
14 New NetTcpBinding0,x
15 New EndpointAddressf'nettcp://localhost:8080/Logger')
16)
17)
18 Dim rc As RoutingConfiguration = New RoutingConfiguration()
19 rc . FitterTable.Add(New Matctf4llMessageFilter0, lep)
20 host. Description. Behaviors.Add(New RoutingBehavior(rc)) Request-reply operations
are failing.
You need to ensure that the router can handle one-way and request-reply operations.
What should you do?

• A. Change line 12 as follows
  GetType(lRequestReplyRouter)
• B. Change line 12 as follows.
  Get Type(IDuplexSessionRouter)
• C. Change line 04 as follows.
  Get Type(lRequestReplyRouter),
• D. Change line 04 as follows
  Get Type(lDuplexSessionRouter),