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

1. 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 Order class includes the following code:

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 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.
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 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.
D) 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.

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

3. A Windows Communication Foundation (WCF) 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 implemented as follows. (Line numbers are included for reference only.)
01 ServiceHost host = new ServiceHost(typeof(RoutingService));
02 host AddServiceEndpoint(
03 typeof(lSimplexDatagramRouter),
04 new NetTcpBinding0, "net.tcp:/flocalhostlRouter"
05);
06 List <ServiceEndpoints lep new List <ServiceEndpoint>0;t
07 lep.Add(
08 new ServiceEndpoint(
09 ContractDescription.GetContract(
10 typeof(lSimplexDatagramRouter)
11),
12 new NetTcpBinding0,
13 new EndpointAddress|'nettcp://localhost: 8080/Logger")
14)
15);
16 RoutingConfiguration rc new RoutingConfigurationO;
17 FilterTable.Add(new MatchAilMessageFilterO, lep);
18 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 03 as follows. typeof(l RequestReplyRouter),
B) Change line 10 as follows. typeof(lDuplexSessionRouter)
C) Change line 10 as follows. typeof(lRequestReplyRouter)
D) Change line 03 as follows. typeof(lDuplexSessionRouter),

4. You are using windows Communication Foundation (WCF) to create a service. You need to implement a custom message-level security binding element Which binding element should you use?

A) SslStreamSecuntyBindingElement
B) WindowsStreamSecurityBindingElement
C) TransportSecurityElement
D) HttpsTransportBindingElement

5. 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(SessionHode:=SessionHode.Required)>
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(SessionMode:=SessionHode.NotAllowed)>

Solutions: