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

1. You develop a Windows Communication Foundation (WCF) service that uses basic authentication for client credentials. This service is currently configured to use message security.
The service is hosted on a server in workgroup mode.
Users report that their passwords are stolen when they use public computers. You need to ensure that messages are secure and users are authenticated.
You prevent the service from being called over HTTP through Microsoft Internet Information Services (IIS) configuration.
What should you do next?

A) Use the message security mode and specify Basic for the transport client credential type.
B) Use the transportWithMessageCredential security mode and specify Basic for the transport client credential type.
C) Use the transportWithMessageCredential security mode and specify None for the transport client credential type.
D) Use the transport security mode and specify None for transport client credential type.

2. You are developing a Windows Communication Foundation (WCF) service. Client applications require reliable sessions to access the service. Users report that they receive
ServerTooBusyException errors when their client application tries to establish a session. You need to ensure that the service can handle a minimum of 30 client connection requests.
Which ReliableSessionBindingElement property should you configure?

A) MaxRetryCount
B) MaxTransferWindowSize
C) MaxPendingChannels
D) InactivityTimeout

3. You are using windows Communication Foundation (WCF) to create a service. You need to implement a custom message-level security binding element Which binding element should you use?

A) SslStreamSecuntyBindingElement
B) WindowsStreamSecurityBindingElement
C) TransportSecurityElement
D) HttpsTransportBindingElement

4. A Windows Communication Foundation (WCF) solution uses the following contract.
<ServiceContract(SessionMode:=SessionMode Allowed)s Public Interface lMyService <OperationContract(lsTerminating:sFalse)s Sub Initialize () <OperationContract(lslnitiating:sFalse)>s Sub DoSomething() <OperationContract(lsterminating:=True)>
Sub Terminate ()
End Interface You need to change this interface so that:
"Initialize is allowed to be called at any time before Terminate is called.
"DoSomething is allowed to be called only after Initialize is called, and not allowed to be called after Terminate is called. "Terminate will be allowed to be called only after Initialize is called
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)

A) Change the ServiceContract attribute of the lMyService interface to the following. ServiceContract(SessionMode:sSessionModeAllowed)?
B) Change the OperationContract attribute of the Terminate operation to the following. OperationContract(Islnitiatings:False, lsTerminating: 'True)
C) Change the ServiceContract attribute of the lMyService interface to the following. ServiceContract(SessionMode:sSessionMode. Required)
D) Change the OperationContract attribute of the Initialize operation to the following. OperationContract(lslnitiating: 'True, IsTerminating: 'False)

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

Solutions: