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

1. 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.)
01 static void Main(string[] args)
02 {
03 ServiceHost host;
05 host.Open();
06 Console.ReadLine();
07 host.Close();
08 }
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(typeof(IDataAccess));
B) host = new ServiceHost(typeof(DataAccessService));
C) host = new ServiceHost("MyApplication.IDataAccess");
D) host = new ServiceHost("MyApplication.DataAccessService");

2. You develop a Windows Communication Foundation (WCF) SOAP service that contains a class named Order. The Order class includes a field named secret that stores private data.

The service has the following requirements:
- The secret field must be encrypted.
- All other fields in the Order class must serialize as plain text.
You need to configure serialization for the Order class.
What should you do?

A) Add a MessageHeader attribute to the secret field and set the ProtectionLevel to
EncryptAndSign.
Add a MessageBodyMember attribute to each of the other fields of the class.
B) Add a MessageHeader attribute to the secret field and set the ProtectionLevel to Sign.
Add a MessageBodyMember attribute to each of the other fields of the class.
C) Add a MessageBodyMember attribute to the secret field and set the ProtectionLevel to
Sign.
Add a MessageBodyMember attribute to each of the other fields of the class.
D) Add a MessageBodyMember attribute to the secret field and set the ProtectionLevel to
EncryptAndSign.
Add a MessageBodyMember attribute to each of the other fields of the class.

3. A Windows Communication Foundation (WCF) service listens for messages at net
tcpilwwwcontoso.comMMyService.
It has a logical address at http/Iwwwcontosocorn)MyService
The configuration for the WCF client is as follows
<endpoint addressrhTttpllwwwcontosocom/MyService"
bindinge"netTc pBinding"
bindingConfiguraton-NetTc pBinding_lMyService
contract="ServiceReference 1. IMyServce'
name='NetTcpBinding_lllyService"/>v
The generated configuration does not provide enough information for the client to communicate with the server.
You need to update the client so that it can communicate with the server what should you do

A) In the client configuration. Change the value of the address attribute to nettcp:/Iwwwcontosocom/MyService
B) After instantiating the client and before invoking any service operation, add this line of code client Endpoint BehaviorsAdd( new EndpointDiscoveryBehawior0{ Enabled true });
C) In the client configuration, change the value of the address attribute to net.tcp:Ilwwwcontosocom/MyServicellisten=http:/Iwwwcontosocom/MyService.
D) After instantiating the client and before invoking any service operation, add this line of code. client. Endpoint BehaviorsAdd( new Client ViaBehavior( new Uhcnet.tc pifwww.contoso. comiIMyService)))

4. A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients (Line numbers are included for reference only)
01 <ServiceContract0>
02PuElic Interface ITeamMessageService
04 <OperationContractO>
05Function GetMessage() As String
06
07 <OperationContract0>
08Sub PutMessage(Byval message As String)
O9End Interface
The code for the serAce class is as follows.
10 Public Class TeamMessageService0
11 Implements lTearmt4essageService
12
1 3Dim key As Guid = Guid.NewGuid()
1 4Dim message As String = "Today's Message'
15
16PuUic Function GetMessage0As String -
1 7lmpements lTearm*AessageServiceGetMessage
18
1 9Retun String. Fommat("Message:{0) Key:{ 1}", message, key)
20End Function
21
22PubIic Sub PutMessage(ByV message As Stnng) -
23lmpements lTearrlessageService PutMessage
24
25Me message = message
26End Sub
27
28End Class
The service is self-hosted The hosting code rs as follows
29Dim host As ServiceHost =
New ServiceHost(GetType(TearrwiessageSeMce))?
3ODim binding As Basic HttpBindngt
New BasicHttpBindiig(BasicHttpSecurityMode. None) 31 host.AddServiceEndpoint(
"MyAppication lTearrtAessageService", binding
Thttp /Ilac aihost. 1 2345)
32host Open()
You need to ensure that all clients calling GetMessage will retrieve the same string, even if the message is upd(ed by clients calling PutMessage what should you do?

A) Add the following attribute to the TeamMessageService class, before line 10.
<ServceBehavior(lnstanceContextMode lnstanceContextMode. Single)>
B) Add the following attribute to the TeamMessageService class, before line 1 0002E
<ServiceBehavior( lnstanceContextll ode. = InstanceContextMode. PerSession)>
C) Redefine the message string in line 14, as follows.
Shared message As String "Today's Message"
Then change the implementation of PutMessage in lines 22-26 to the following
Public Sub PutMessage(ByVal message As rng) - Implements ITean-
MessageService.PutMessage
TeamMessageSenAce.message = message End Sub
D) Pass a service instance to the instancing code in line 29, as follows.
Dim host As ServiceHost z New ServiceHost(New TeamMessageServiceO)

5. You develop a Windows Communication Foundation (WCF) service that contains the following code segment. (Line numbers are included for reference only.)

You need to ensure that all service endpoints are available to client applications. Which code segment should you insert at line 04?

A) Option B
B) Option D
C) Option C
D) Option A

Solutions: