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

1. A Windows Communication Foundation (WCF) service has a callback contract. You are developing a client application that will call this service.
You must ensure that the client application can interact with the WCF service.
What should you do?

A) On the client, create a proxy derived from DuplexClientBase<TChannel>.
B) On the OperationContractAttribute, set the ReplyAction property value to the endpoint address of the client.
C) On the OperationContractAttribute, set the AsyncPattern property value to true.
D) On the client, use GetCallbackChannel<T>.

2. You are modifying an existing Windows Communication Foundation (WCF) service that is defined as follows;

SubmitOrder makes a call to another service.
The ProcessMessage method does not perform as expected under a heavy load you need to enable processing of multiple messages.
New messages must only be processed when the ProcessMessage method is not processing requests, or when it is waiting for calls to SubmitOrder to return.
Which attribute should you apply to the MessageProcessor class?

A) ServiceBehavior (ConcurrencyMode ConcurrencyMode Multiple)
B) CallbackBehavior (ConcurrencyMode: ConcurrencyMode Reentrant)
C) ServiceBehavior (Conc urrencyMode: =Conc urrencyMode. Reentrant)
D) CallbackBehavior (ConcurrencyMode:=ConcurrencyModeMuttiple)

3. You are developing a Windows Communication Foundation (WCF) service named CalculatorService, which implements the ICalculatorService contract. The service is configured to be discoverable through UDP. CalculatorService contains multiple endpoints. One of the endpoints is configured with the following behavior.

You need to log all the endpoint metadata information that is added by the service host. Which code segment should you use?

A) Option D
B) Option A
C) Option B
D) Option C

4. 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 bindingConfiguration attribute in the endpoint element of the configuration file to wsHttpBinding.
C) Set the PrincipalPermissionAttribute on the service contract and update the binding 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.

5. DRAG DROP
You are preparing to deploy a Windows Communication Foundation (WCF) service to a production environment.
The service must not be vulnerable to a man-in-the-middle attack. You need to configure the service to use X.509 certificate security.
Which four actions should you perform in sequence? (To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.)

Solutions: