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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. One of the parameters used with the service operations is a security token. The security token is not sensitive. The monitoring software tracks security tokens and can read tokens in clear text only.
The company security policy requires that you validate all clear text data passed over the corporate network.
You need to ensure that the service verifies that the security token is not changed during transit.
What should you do?

A) Implement ISecureConversationSession in the message contract class.
B) Implement IEndpointldentityProvider in the message contract class.
C) For all the security-sensitive members, set the ProtectionLevel parameter of the MessageBodyMember or MessageHeader attribute to EncryptAndSign.
D) For all the security-sensitive members, set the ProtectionLevel parameter of the MessageBodyMember or MessageHeader attribute to Sign.

2. You are creating a Windows Communication Foundation (WCF) service that is implemented as follows.
(Line numbers are included for reference only.)
01|ServiceContract]
02[ServiceBehavior (includeExceptionDetailslnFaults = true) 1
03putiic class OrderService
04{
05[Operation Contract]
06putiic void Submit Order (Order an Order)
07{
O8try
09{
10...
11)
12catch (DivideByZeroExcepton ex)
13{
15)
16)
17)
You need to ensure that the stack trace details of the exception are not included in the error information sent to the client.
What should you do?

A) After hne 05, add the following line. [FaultContract(typeof(FaukEception<Order>))J Replace line 14 with the following line throw ex;
B) Replace line 14 with the following line. Throw:
C) Alter hne 05, add the following line [FaultContract(typeof(FaultException<Order>))J Replace line 14 with the following line. Throw new FaultException<Order>(anOrder, "Divide by zero exception"):
D) Replace line 14 with the following line throw new FaultException<Order>(anOrder, ex.ToString(fl;

3. You need to modify a client application that consumes a Windows Communication Foundation (WCF) service.
The service metadata is no longer available.
You need to modify the previously generated proxy to include asynchronous calls to the service.
What should you do?

A) Update the service reference with the Generate asynchronous operations option.
B) Create a class with the same name as the previously generated proxy and add the new asynchronous methods. Add the new class to a namespace that is different from the original proxy.
C) Create a partial class for the previously generated proxy and include the new asynchronous methods.
D) Create a class with the same name as the previously generated proxy and add the new asynchronous methods as partial methods. Add the new class to a namespace that is different from the original proxy.

4. A Windows Communication Foundation (WCF) service is self-hosted in a console application. The service implements the IDataAccess contract, which is defined in the
MyApplication namespace.
The service is implemented in a class named DataAccessService, which implements the
IDataAccess interface and also is defined in the MyApplication namespace.
The hosting code is as follows. (Line numbers are included for reference only.)

You need to create a ServiceHost instance and assign it to the host variable. You also need to instantiate the service host.
Which line of code should you insert at line 04?

A) host = New ServiceHost(GetType(DataAccessService))
B) host = New ServiceHost(GetType(IDataAccess))
C) host = New ServiceHost("MyApplication.IDataAccess")
D) host = New ServiceHost("MyApplication.DataAccessService")

5. You are developing a Windows Communication Foundation (WCF) service. One of the service operations contains the following code.

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

Solutions: