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

Question 1

You are developing a Windows Communication Foundation (WCF) service to provide an in-memory cache for many Web applications. The service contract is defined as follows. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 Public Interface IDataCache 03
04 . . . 05 End Interface 06 07 08 Public Class DataCache 09 Implements IDataCache 10
11 . . . 12 End Class
You need to ensure that all users share the cache.
Which code segment should you insert at line 07?

A. <ServiceBehavior(TransactionIsolationLevel:= IsolationLevel.ReadCommitted)>
B. <ServiceBehavior(InstanceContextMode:= InstanceContextMode.Single)>
C. <ServiceBehavior(TransactionIsolationLevel:= IsolationLevel.RepeatableRead)>
D. <ServiceBehavior (InstanceContextMode : = InstanceContextMode.PerSession)>

Question 2

You are creating an application that consumes a Windows Communication Foundation (WCF) service. The service implements the IService contract. The client application contains the CallbackHandler class, which implements IServiceCallback.
You need to ensure that a client proxy is created that can communicate with the service over a duplex channel.
Which code segment should you use?

A. var handler = new CallbackHandler();
var clientFactory =
new DuplexChonnelFaccory<IService>{
typeof(CallbackHandler), new WSDualHttpBinding ()); var client =
clientFactory.CreateChannel(
new InstanceContext (handler) , new EndpointAddress ("")) ;
B. var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
new WSHttpBinding());
var client = clientFactory.CreateChannel(
new InstanceContext (handler) , new EndpointAddress ("")) ;
C. var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
typeof(CallbackHandler), new WSDualHttpBinding());
var client = clientFactory.CreateChannel(
new EndpointAddress ("")) ;
D. var handler = new CallbackHandler();
var clientFactory = new DuplexChannelFactory<IService>{
new WSHttpContextBinding() ;
var clienc = clientFactory.CreateChannelt
new InstanceContext (handler) , new EndpointAddress (" "));

Question 3

A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.)

The code for the service class is as follows.

The service is self-hosted. The hosting code is as follows.

You need to ensure that all clients calling GetMessage will retrieve the updated string if the message is updated by any client calling PutMessage.
What should you do?

A. Redefine the message string in line 13, as follows.
static string message = "Today' s Message";
Then change the implementation of PutMessage in lines 19-22 to the following.
public void PutMessage(string message) {
TeamMessageService.message = message; >
B. Pass a service instance to the instancing code in line 24, as follows.
ServiceHost host = new ServiceHost(new TeamMessageService());
C. Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
D. Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(InstanceContextMode =
InstanceContextMode.PecSession) ]
Than change che binding definition on the service at line 25, and on the client to the
following.
WSHttpBinding binding = new WSHttpBinding(SecurityMode.None);
binding.ReiiabieSession.Enabled = true;

Question 4

An ASP.NET application hosts a RESTful Windows Communication Foundation (WCF) service at /Services/Contoso.svc . The service provides a JavaScript resource to clients. You have an explicit reference to the JavaScript in your page markup as follows.
<script type="text/3avaScript" src="/Secvices/Contoso.svc/js" />
You need to retrieve the debug version of the service JavaScript.
What should you do?

A. In the <<H>@ Page <*to> header, set the Debug attribute to true.
B. In the <<to@ ServiceHost %> header for /Services/Contoso.svc, set the Debug attribute to true.
C. In the script tag, add a debug attribute and set its value to true.
D. In the script tag, append debug to the src attribute.

Question 5

A Windows Communication Foundation (WCF) client configuration file contains the following XML segment in the system.serviceModel element.
<client>
<endpoint address=" net.tcp://server/ContosoService "
binding=" netTcpBinding "
contract=" Contoso. IContosoService "
name=" netTcp " / >
<endpoint address=" net.pipe://localhost/ContosoService "
binding=" netNamedPipeBinding "
contract=" Contoso. IContosoService "
name=" netPipe " />
</client>
You need to create a channel factory that can send messages to the endpoint listening at net.pipe://localhost/ContosoService.
Which code segment should you use

A. ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(
" net.pipe://localhost/ContosoService ");
B. ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(" netPipe ");
C. ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(" Contoso. IContosoService ");
D. ChannelFactory < Contoso. IContosoService > factory =
new ChannelFactory < Contoso. IContosoService >(" netNamedPipeBinding ");

Solutions: