You create a Windows Communication Foundation (WCF) service and deploy it with wsHttpBinding and message security enabled.
You create an intermediate WCF service for logging messages sent to the primary service. The intermediate service is called via the clientVia endpoint behavior.
The primary service is receiving malformed data from a client application.
You need to enable inspection of the malformed data and prevent message tampering.
What should you do?

• A. Specify a protection level of Sign in the service contract for the intermediate service. Disable transport security from the client application configuration file.
• B. Specify a protection level of None in the service contract for the intermediate service. Disable message and transport security from the client application configuration file.
• C. Modify the binding on the intermediate service to use netNamedPipeBinding.
• D. Modify the binding on the intermediate service to use webHttpBinding.

You are creating an application that consumes a Windows Communication Foundation
(WCF) service. The service implements the IService contract. The client application contains the CallbackHandler class, which implements IServiceCallback.
You need to ensure that a client proxy is created that can communicate with the service over a duplex channel.
Which code segment should you use?

• A. Dim handler = New CallbackHandler()
  Dim clientFactory =
  New DuplexChannelFactory(Of IService)( New WSHttpBinding())
  Dim client = clientFactory.CreateChannel(
  New InstanceContext(handler),
  New EndpointAddress (""))
• B. Dim handler = New CallbackHandler()
  Dim clientFactory =
  New DuplexChannelFactory( Of IService)(
  GetType(CallbackHandler),
  New USDualHttpBindingO )
  Dim client = clientFactory.CreateChannel(
  New InstanceContext (handler) ,
  New EndpointAddress ("") )
• C. Explanation:
  QUESTIO NO: 98 You develop a Windows Communication Foundation (WCF) service. It is used exclusively as an intranet application and is currently unsecured.
  You need to ensure that the service meets the following requirements:
  ---
  The service now must be exposed as an Internet application. The service must be secured at the transport level. Impersonation and delegation cannot be enabled.
  What should you use?
  A. basicHttpBinding and HTTP
  B. basicHttpBinding and Kerberos
  C. wsHttpBinding and Kerberos
  D. wsHttpBinding and HTTPS
• D. Dim handler = New CallbackHandler()
  Dim clientFactory =
  New DuplexChannelFactory(Of IService)(
  New WSHttpContextBinding() )
  Dim client = clientFactory.CreateChannel( New InstanceContext(handler),
  New EndpointAddress (""))
• E. Dim handler - New CallbackHandler()
  Dim clientFactory =
  New DuplexChannelFactory(Of IService)(
  GetType(CallbackHandler),
  New HSDualHttpBindingO) Dim client = clientFactory.CreateChannel( New
  EndpointAddress ("") )

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

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. MaxPendingChannels
• B. InactivityTimeout
• C. MaxTransferWindowSize
• D. MaxRetryCount

A Windows Communication Foundation (WCF) solution exposes the following service over a TCP binding. (Line numbers are included for reference only.)
01 [ServiceContract]
02 [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]
03 public class DataAccessService
04 {
05 [OperationContract]
06 public void PutMessage(string message)
07 {
08 MessageDatabase.PutMessage(message);
09 }
10 [OperationContract]
11 public string[] SearchMessages(string search)
12 {
13 return MessageDatabase.SearchMessages(search);
14 }
15 }
MessageDatabase supports a limited number of concurrent executions of its methods.
You need to change the service to allow up to the maximum number of executions of the methods of MessageDatabase. This should be implemented without preventing customers from connecting to the service.
What should you do?

• A. Add a throttling behavior to the service, and configure the maxConcurrentCalls.
• B. Change the service behavior as follows. [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.Single)]
• C. Add a throttling behavior to the service, and configure the maxConcurrentSessions.
• D. Change the service behavior as follows. [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Single, InstanceContextMode = InstanceContextMode.PerSession)]