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

1. Your company has an existing Windows Communication Foundation (WCF) service. The following code segment is part of the service. (Line numbers are included for reference only.)

You need to ensure that AJAX client applications can access the service. Which code segment should you insert at line 02?

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

2. A Windows Communication Foundation (WCF) service implements the following contract. (Line numbers are included for reference only.)
01 <ServiceContract()>
02 Public Interface IDataAccessService
03
04 <OperationContract()>
05 Sub PutMessage(ByVal message As String)
06
07 <OperationContract()>
08 <FaultContract(GetType(TimeoutFaultException))>
09 <FaultContract(GetType(FaultException))>
10 Function SearchMessages(ByVal search As String) As String ()
11
12 End Interface
The implementation of the SearchMessages method throws TimeoutFaultException exceptions for database timeouts. The implementation of the SearchMessages method also throws an Exception for any other issue it encounters while processing the request. These exceptions are received on the client side as generic FaultException exceptions.
You need to implement the error handling code for SearchMessages and create a new channel on the client only if the channel faults.
What should you do?

A) Catch and handle FaultException. Catch TimeoutFaultException and create a new channel.
B) Catch and handle TimeoutFaultException. Catch FaultException and create a new channel.
C) Catch and handle both TimeoutFaultException and FaultException.
D) Catch both TimeoutFaultException and FaultException. Create a new channel in both cases.

3. You are developing a Windows Communication Foundation (WCF) service. You enable message logging, trace listeners, activity propagation, and tracing on the trace sources.
You have the following code segment in the client application. (Line numbers are included for reference only.)

You encounter errors when your client application consumes the service.
You need to ensure that your client application can correlate tracing information with the service.
Which code segment should you add at line 04?

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

4. You are configuring a routing service to call a target service. The routing service has no knowledge of the target service's data tyes other than the service contract.
The operation contract for all of the methods of the target service specifies IsOneWay=true.
You need to specify the endpoint information for the routing service.
What should you do?

A) In the target service configuration file, specify "*" for the client endpoint contract and "*" for the service endpoint contract.
B) In the routing service configuration file, specify "*" for the client endpoint contract and System.ServiceModel.Routing.ISimplexDatagramRouter for the service endpoint contract.
C) In the routing service configuration file, specify "*" for the client endpoint contract and System.ServiceModel.Routing.IRequestReplyRouter for the service endpoint contract.
D) In the routing service configuration file, specify "*" for the client endpoint contract and "*" for the service endpoint contract.

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

Solutions: