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

1. An existing Windows Communication Foundation (WCF) service uses basicHttpBinding. You are releasing updates to the service and the client application.
You need to enable the client application to flow transactions to the service.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Change the binding to use wsHttpBinding.
B) Change to a custom binding that has the transactionFlow, textMessageEncoding, and httpTransport binding elements in this order.
C) Change the binding to use basicHttpContextBinding.
D) Change to a custom binding that has the httpTransport, textMessageEndcoding, and transactionFlow binding elements in this order.

2. You want to debug the Windows Communication Foundation (WCF) client and server interaction through message and application tracing.
You need to correlate traces generated on the client and the server.
Which XML segment should you add to the system. diagnostics configuration element in the client and server application configuration file?

A) <sources>
<source names"System. ServiceModeiMessageLogging" propagateActivitye'true" switch Values' Warning, ActivityTracing'5 <listeners> <add name="ServiceModelTraceListener" I> </listeners> </source> </sources>
B) <sources>
<source names"System. ServiceModel" switchValues'VerboseActivityTracing"> <listeners>
<add namee"ServiceModelTraceListener" /> </listeners> </source>
</sources>
C) <sources> <source names" System ServiceModel. MessageLogging"
switchValuee"Verbose"> <listeners>
<add namez"ServiceModelTraceListener" /> <Listeners>
</source> </sources>
D) <sources> <source propagate Activitye'true" namee"System Service Model"
switchValues'Warning, ActivityTracing'> <listeners
<add namez"ServiceModelTraceListener" /> </listeners>
</source> </sources>

3. You are developing a Windows Communication Foundation (WCF) service.
One of the service operations contains the following code.
private static int counter = 0;
[OperationContract]
public void IncrementCount()
[
counter++;
}
You need to set a service behavior that prevents two or more threads from incrementing the counter variable at the same time.
Which code segment should you use to set the service behavior?

A) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerSession,
ConcurrencyMode = ConcurrencyMode.Single)]
B) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Single)]
C) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.PerCall,
ConcurrencyMode = ConcurrencyMode.Reentrant)]
D) [ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single,
ConcurrencyMode = ConcurrencyMode.Hultiple)]

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

5. 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 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.
B) 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.
C) 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.
D) Add a DataProtectionPermission attribute to the each property and set the ProtectData property to True.

Solutions: