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QUESTION 291
A Windows Communication Foixdation (WCF) solution uses the following contracts (Line numbers are included for reference only)
01 eServiceContract(Callback contract: GetType(lNameService))>
02 Putlic Interface I(IeetingService
04 <OperationContractO>
05 Function GetMessage() As Stnng
07 End Interface
09 <ServiceContractO>
10 Public Interface INameService
12 <OperationContractO>
13 Function GetName() As String
15 End Interface
The code that implements the KleetingService interface is as follows.
20 Public Class GretingService
21 Impements lGreaingService
23 Public Function GetMessage0As String –
24 lmpements IGredingService. GetMessage
26 Dim clientChann As INameService =
27 OperationContet. Current.
28 GetCallbackChamel(Of INameService)()
29 Dim clientName As String = clientChannelGetName()
30 Retumn String Format(“Hello {O)”, clientName)
32 End Function
33 hnd Class
The service is self-hosted The hosting code is as follows.
35 Dim host As SeniceHost =
36 New ServiceHost(GetType(GrstingService))?
37 Dim binding As NetTcpBinding =
38 New NetTcpBinding(Sec urityMode. None)
39 hostAddServiceEndpoint(‘Myapplication lGreetingService”.
40 bincng, net.tcp:Ilocalhost: 12345W)
41 HotOpen()l
The code that implements the INameService interface is as follows.
42 Class NameService
43 lmpements INameService
45 Dim name As String
47 Public Sub NameService(ByV name As String)
48 Me.reme = name
49 End Sub
51 Public Function GetName() As String –
52 lmpements INameService. GeName
54 Reti.rn name
55 End Function
56 End Class Currently, this code fails at runtime, and an Invalid Operation Exception is thrown at mne 25.
You need to correct the code so that the call from the service back to the client complets successfully
What e two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A.    Change the service contract definition in line 01 as follows.
[ServiceContract(CallbackContract = typeof(INameService),
SessionMode = SessionMode.Required)]
B.    Add the following attribute to the NameService class, before line 40.
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Reentrant)]
C.    Add the following attribute to the GreetingService class, before line 20.
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Reentrant)]
D.    Add the following attribute to the GreetingService class, before line 20.
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]

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QUESTION 271
Drag and Drop Question
You create a Windows Communication Foundation (WCF) service.
The service uses a federated security architecture.
The architecture consists of the following components:
– Order service
– Store security token service (STS)
– Home security token service (STS)
– Order client application
The Order service includes the following markup:

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QUESTION 241
Four Windows Communication Foundation (WCF) services are hosted in Microsoft Internet Information Services (IIS).
No behavior configuration exists in the web.config fiIe.
You need to configure the application so that every service and endpoint limits the number of concurrent calls to 50 and the number of concurrent sessions to 25.
Which XML segment should you add to the system.serviceModel configuration section of the web.config file?

A.    <behaviors>
<serviceBehaviors>
<behavior name=”*”>
<serviceThrottling maxConcurrentCalls=”50″
maxConcurrentSessions=”25″/>
</behavior>
</serviceBehaviors>
</behaviors>
B.    <behaviors>
<serviceBehaviors>
<behavior name=”default”>
<serviceThrottling maxConcurrentCalls=”50″
maxConcurrentSessions=”25″/>
</behavior>
</serviceBehaviors>
</behaviors>
C.    <behaviors>
<serviceBehaviors>
<behavior name=””>
<serviceThrottling maxConcurrentCalls=”50″
maxConcurrentSessions=”25″/>
</behavior>
</serviceBehaviors>
</behaviors>
D.    <behaviors>
<serviceBehaviors>
<behavior name=”ALL”>
<serviceThrottling maxConncurentCalls=”50″
maxConcurrentSessions=”25″ />
</behavior>
</serviceBehaviors>
</behaviors>


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QUESTION 211
You are debugging a Windows Communication Foundation (WCF) service.
The service uses signed and encrypted messages.
You need to configure logging so that you can read the contents of the messages.
What should you do?

A.    Set maxSizeMessagesToLog to 10
B.    Set logMessageAtServiceLevel to true.
C.    Set maxMessagesToLog to 10.
D.    Set logMessageAtTransportLevel to true.

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QUESTION 181
A self-hosted Windows Communication Foundation (WCF) service uses a secure HTTP binding with a custom principal permission mode.
The binding requires users to provide their Windows logon credentials.
You need to retrieve the identity of the caller.
What are two possible properties you can use to achieve this goal? (Each correct answer presents a complete solution Choose two)

A.    Thread.CurrentPrincipal.Identity.Name
B.    HttpContext.Current.User.Identity.Name
C.    ServiceSecurityContext.Current.PrimaryIdentity.Name
D.    OperationContext.Current.ServiceSecurityContext.PrimaryIdentity.Name

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QUESTION 151
You develop a Windows Communication Foundation (WCF) service.
You enable all performance counters and run multiple calls to the service.
The service must isolate session data for each user.
You need to monitor the instancing behavior used in the service.
Which performance counter should you monitor?

A.    ServiceModelService 4.0.0.0\Calls
B.    ServiceModelService 4.0.0.0\Instances
C.    ASP.NET State Service\State Server Sessions Active
D.    ASP.NET State Service\State Server Sessions Total

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QUESTION 121
You are hosting a Windows Communication Foundation (WCF) service under Microsoft Interent Information Services (IIS) 7.0.
You have set up a web site in IIS Manager.
The physical path is c:\wwwroot\Calendar.
There is a Calendar.svc file in the c:\wwwroot\Calendar folder.
It contains the following directive:
<% @ServiceHost Language=”C#” Debug=”true” Service=”Calendar.Calendar” CodeBehind=”CalendarSvc.cs” %>
The CalendarSvc.cs file contains the source for the Calendar class in the Calendar namespace.
You compile this code into the Calendar.dll file.
You need to deploy your service to the web site.
What should you do?

A.    Copy the Calendar.dll file to the c:\wwwroot\Calendar\code folder
B.    Copy the Calendar.dll file to the c:\wwwroot\Calendar\bin folder
C.    Copy the Calendar.svc.cs file to the c:\wwwroot\Calendar\bin folder
D.    Copy the Calendar.svc.cs file to the c:\wwwroot\Calendar\code folder

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QUESTION 111
You are developing a Windows Communication Foundation (WCF) client application.
You instantiate a client class that inherits from ClientBase.
The client instance must always be shut down in such a way that it can free up any resources it is referencing.
You need to ensure that all exceptions are caught and the instance is always properly shut down.
Which code segment should you use?

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QUESTION 71
Drag and Drop Question
You are developing a Windows Communication Foundation (WCF) service that contains a method named ProcessPayments.
The service is hosted in Internet Information Services (IIS).
You have the following requirements:
– Create a new instance of the service every time that a client application calls the ProcessPayments method.
– Process every call from client applications one at a time.
You need to complete the code for the WCF service.
Which four code segments should you use in sequence? (To answer, move the appropriate code segments from the list of code segments to the answer area and arrange them in the correct order.)

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QUESTION 31
You are developing a Windows Communication Foundation (WCF) service.
One of the parameters used with the service operations is a security token.
The security token is not sensitive.
The monitoring software tracks security tokens and can read tokens in clear text only.
The company security policy requires that you validate all clear text data passed over the corporate network.
You need to ensure that the service verifies that the security token is not changed during transit.
What should you do?

A.    For all the security-sensitive members, set the ProtectionLevel parameter of the
MessageBodyMember or MessageHeader attribute to EncryptAndSign.
B.    Implement IEndpointldentityProvider in the message contract class.
C.    Implement ISecureConversationSession in the message contract class.
D.    For all the security-sensitive members, set the ProtectionLevel parameter of the
MessageBodyMember or MessageHeader attribute to Sign.

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Part 1 – C#
QUESTION 1
You have an existing Windows Communication Foundation (WCF) service.
You need to ensure that other services are notified when the service is started.
What should you do?

A.    Add the following standard endpoint to the service.
<endpoint name=”udpAnnouncementEndpoint”
kind=”udpDiscoveryEndpoint” />
B.    Add the following standard endpoint to the service.
<endpoint name=”udpDiscoveryEndpoint”
kind=”udpAnnouncementEndpoint” />
C.    Add a service behavior with the following element.
<serviceDiscovery>
<announcementEndpoints>
<endpoint kind=”udpDiscoveryEndpoint” />
</announcementEndpoints>
</serviceDiscovery>
D.    Add a service behavior with the following element.
<serviceDiscovery>
<announcementEndpoints>
<endpoint kind=”udpAnnouncementEndpoint” />
</announcementEndpoints>
</serviceDiscovery>

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