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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 client, use GetCallbackChannel<T>.
D) On the OperationContractAttribute, set the AsyncPattern property value to true.

2. A Windows Communication Foundation (WCF) service is responsible for transmitting XML documents between systems. The service has the following requirements:
- It must minimize the transmission size by attaching the XML document as is without using escape characters or base64 encoding. - It must interoperate with systems that use SOAP but are not built on the .NET platform.
You need to configure the service to support these requirements.
Which message encoding should you use?

A) Text message encoding with message version set to none.
B) Binary message encoding
C) MTOM (Message Transmission Optimization Mechanism) message encoding.
D) Text message encoding with message version set to SOAP 1.2.

3. You develop a Windows Communication Foundation (WCF) service that employees use to access bonus information. You define the following service contract. (Line numbers are included for reference only.)
01 [ServiceContract(SessionMode = SessionMode.Required)]
02 public interface IFinancialService
03 {
04 [OperationContract]
05 string Login(int employeeID, string passwordHash);
06
07 [OperationContract]
08 double GetBonus(int month);
09
10 [OperationContract(IsTerminating = true)]
11 void Logout();
12 }
Client applications can invoke methods without logging in.
You need to ensure that the client applications invoke Login before invoking any other method.
You also need to ensure that client applications cannot consume the service after invoking Logout.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Replace line 04 with the following code. [OperationContract(IsInitiating = true, IsTerminating = true)]
B) Replace line 10 with the following code. [OperationContract(IsInitiating = false, IsTerminating = true)]
C) Replace line 04 with the following code. [OperationContract(IsInitiating = false)]
D) Replace line 07 with the following code. [OperationContract(IsInitiating = false)]

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

5. You are developing a Windows Communication Foundation (WCF) service. The service configuration file has a <System.Diagnostics> element defined.
You need to ensure that all security audit information, trace logging, and message logging failures are recorded.
Which configuration segment should you add to the <System.Diagnostics> element?

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

Solutions: