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

1. You are developing a Windows Communication Foundation (WCF) service that must be
discoverable.
You need to ensure that the ServiceHost instance supports multiple discovery versions.
What should you do?

A) Specify a unique DiscoveryVersion parameter for each endpoint constructor.
Use the same value for the Address property of each endpoint.
B) Specify a unique DiscoveryVersion parameter for each endpoint constructor.
Use a unique value for the Address property of each endpoint.
C) Use the endpoint constructor without the DiscoveryVersion parameter.
Use a unique value for the Address property of each endpoint.
D) Use the endpoint constructor without the DiscoveryVersion parameter.
Use the same value for the Address property of each endpoint.

2. 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.

3. You are developing a Windows Communication Foundation (WCF) service. The following code defines and implements the service. (Line numbers are included for reference only.)

You need to ensure that two identical copies of the received message are created in the service.
Which code segment should you insert at line 14?

A) Dim msgCopy As Message = message
Dim returnMsg As Message = message
B) Dim msgCopy As Message = TryCast(
TryCast(message.CreateBufferedCopy(8192), Object), Message)
Dim returnMsg As Message = TryCast(
TryCast(message.CreateBufferedCopy(8192), Object), Message)
C) Dim buffer As MessageBuffer = message.
CreateBufferedCopy(8192)
Dim msgCopy As Message = buffer.CreateMessage()
Dim returnMsg As Message = buffer.CreateMessage()
D) Dim buffer As MessageBuffer = message.
CreateBufferedCopy(8192)
Dim msgCopy As Message = buffer.CreateMessage()
Dim returnMsg As Message = msgCopy

4. You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.
<ServiceContract() > Public Interface IPaymentService <OperationContract() > Sub RecordPayments(ByVal person As Person) End Interface Public Class Person End Class Public Class Employee Inherits Person End Class Public Class Customer Inherits Person End Class
You need to ensure that RecordPayments can correctly deserialize into an Employee or a Customer object.
What should you do?

A) Implement the IExtension(Of T) interface in the Person class.
B) Implement the IExtensibleDataObject interface in the Person class.
C) Add the following KnownType attribute to the Employee class and to the Customer class. <KnownType(GetType(Person))>
D) Add the following KnownType attributes to the Person class. <KnownType(GetType(Employee))> <KnownType(GetType(Customer))>

5. The endpoint of a Windows Communication Foundation (WCF) service uses basicHttpBinding for its binding. Your company's policies have changed to require that messages not be sent in clear text.
You must ensure that all messages are encrypted when traveling across the network.
What should you do?

A) Set the ProtectionLevel property on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to webHttpBinding.
B) Set the PrincipalPermissionAttribute on the service contract and update the binding attribute in the endpoint element of the configuration file to wsHttpBinding.
C) Set the PrincipalPermissionAttribute on the service contract and update the bindingConfiguration attribute in the endpoint element of the configuration file to wsHttpBinding.
D) Set the ProtectionLevel property on the service contract and update the binding attribute in the endpoint element of the configuration file to wsHttpBinding.

Solutions: