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

1. Windows Communication Foundation (WCF) application uses a data contract that has several data members.
You need the application to throw a Serialization Exception if any of the data members are not present when a serialized instance of the data contract is deserialized.
What should you do?

A) Set the lsRequired property of each data member to true.
B) Set the Emit Default Value property of each data member to false.
C) Add the Known Type attribute to the data contract.
Set a default value in each of the data member declarations.
D) Add the Known Type attribute to the data contract.
Set the Order property of each data member to unique integer value.

2. You are creating a Windows Communication Foundation (WCF) service. The service endpoints change frequently.
On the service, you add a new ServiceDiscoveryBehavior to the Behaviors collection of the ServiceHost Description property.
You need to ensure that client applications can communicate with the service and discover changes to the service endpoints.
What should you do?

A) Use the DiscoveryProxy class and the EndpointDiscoveryMetadata class to set up the binding in the client application.
B) Add a new ServiceDiscoveryBehavior to the Behaviors collection in the client application.
C) Add a new AnnouncementClient to the Behaviors collection in the client application.
D) Use the FindCriteria class and the UdpDiscoveryEndpoint class to set up the binding in the client application.

3. You are creating a Windows Communication Foundation (WCF) service that accepts messages from clients when they are started. The message is
defined as follows. <MessageContract()> Public Class Agent Public Property CodeName As String Public Property SecretHandshake As String End Class You have the following requirements:
The CodeName property must be sent in clear text. The service must be able to verify that the property value was not changed after being sent by the client.
The SecretHandshake property must not be sent in clear text and must be readable by the service.
What should you do?

A) Add a DataProtectionPermission attribute to the each property and set the ProtectData property to True.
B) Add an ImmutableObject attribute to the CodeName property and set its value property to True. Add a Browsable attribute to the SecretHandshake property and set its value to False.
C) Add an XmlText attribute to the CodeName property and set the DataType property to Signed. Add a PasswordPropertyText attribute to the SecretHandshake property and set its value to True.
D) Add a MessageBodyMember attribute to the CodeName property and set the ProtectionLevel to Sign. Add a MessageBodyMember attribute to the SecretHandshake property and set the ProtectionLevel to EncryptAndSign.

4. You are adding a Windows Communication Foundation (WCF) service to an existing application. The application is configured as follows. (Line numbers are included for reference only.)
01 <configuration>
02 <system.serviceModel>
03 <services>
04 <service name="Contoso.Sales.StockService"
behaviorConfiguration="MetadataBehavior">
06 <host>
07 <baseAddresses>
08 <add
baseAddress="http://contoso.com:8080/StockService" />
09 </baseAddresses>
10 </host>
11 </service>
12 </services>
13 <behaviors>
14 <serviceBehaviors>
15 <behavior name="MetadataBehavior">
16 </behavior>
17 </serviceBehaviors>
18 </behaviors>
You need to configure the service to publish the service metadata.
Which two actions should you perform?
(Each correct answer presents part of the solution. Choose two.)

A) Add the following XML segment between lines15 and 16.
<serviceDiscovery>
<announcementEndpoints>
<endpoint address=""/>
</announcementEndpoints>
</serviceDiscovery>
B) Add the following XML segment between lines 10 and 11.
<endpoint address=""
binding="basicHttpBinding"
contract="IMetadataExchange" />
C) Add the following XML segment between lines 10 and 11.
<endpoint address=""
binding="mexHttpBinding"
contract="IMetadataExchange" />
D) Add the following XML segment between lines 15 and 16
<serviceMetadata httpGetEnabled="true"/>

5. You are developing a Windows Communication Foundation (WCF) service that contains the following operation contract.
<OperationContract()>
Function GetCustomerNames() As CustomerNames
The operation returns customer names.
You need to develop a definition for the operation contract that produces XML with the following structure.

Which code segment should you use

A) <MessageContract(WrapperName:="")> Public Class CustomerNames
B) <MessageContract(IsWrapped:=False)> Public Class CustomerNames
C) <DataContract()> Public Class CustomerNames <DataMember(IsRequired:=False)> Public Names() As String End Class
D) <MessageBodyMember()> Public Names() As String End Class
E) <DataContract()> Public Class CustomerNames <DataMember ()> Public Names () As String End Class
F) <MessageBodyMember()> Public Names() As String End Class

Solutions: