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

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

2. The following is an example of a SOAP envelope.
<s:Enelope xmlns:se'http://schemas.xmlsoporg/soap/envelopef'>
<s: Header> <h:Storeld xmlns:he"http:/!www.contoso.com"s
<Ih: Storeld>
</s:Header>
<s:Body>
<CheckStockRequest xmlnsehttp://wwwcorIosocom">
<ltemld>2469 <Iltenld>4
</CheckStoc kRequest>
<Is: Body>
<Is: Envelope>
You need to create a message contract that generates the SOAP envelope.
1 which code segment should you use?

A) [MessageContract(WrapperNamespace="http://www. contosocom")] pi+-lic class
CheckStockRequest
{
[MessageHeader(Na-mespacesttp://wwwcontoso. comn")]
public mnt Storeld{get set.}
public mnt ltemld{get: set;}
)
B) [MessageContract(WrapperNamespace="http:I/www.contoso.comn")] public class
CheckStoc kRequest
{
[MessageHeader(Namespaces"http:I/www.contosocom")]o
public nmt Storeld{get; set;)
[MessageBodyMember(Namespaces"http://www. contoso . comn")]
public nmt ltemld{get; set;}
}
C) (MessageContract(WrapperNamespace="httpJ/www. contoso.com")] public class
CheckStockRequest
{
[MessageHeader(Namespace11tp:IIwww. contoso. comn")]
public int Storeld{get set;}
(MessageBodyMember]
public int ltemmld(get set}
}
D) [MessageContract(WrapperName="http:I/www. contoso. comn")]
public class CheckStockRequest {
[MessageHeader(Nanez"http:llwww.contoso.com")] public mnt Storeld{get; set.}
[MessageBodyMember(Namee'intp://www..contoso.com")] public nit itemld{get set;)
}

3. You are creating a windows Communication Foundation (WCF) service to process orders. The data contract for the order is defined as follows:
[DataContract] public class Order { ... [DataMemberl public string CardHolderName { get; set; [DataMember] public string CreditCardNumber { get; set; } }
You have the following requirements
- Enable the transmission of the contents of Order from the clients to the service. - Ensure that the contents of CreditCardNumber are not sent across the network in clear text. - Ensure that the contents of CreditCardNumber are accessible by the service to process the order.
You need to implement the service to meet these requirements.
What should you do?

A) Change the data type of CreditCardNumber from string to SecureString
B) Implement the CreditCardNumber property getter and setter. In the setter, run the value of the CreditCardNumber through the MD5CryptoServiceProvider class TransformBlock method
C) Add a DataProtectionPermission attribute to the CreditCardNumber property and set the ProtectData property to true.
D) Convert the DataContract to a MessageContract and set the ProtectionLevel property to SignAndEncrypt

4. HOTSPOT
You are developing a Windows Communication Foundation (WCF) service. You implement a data contract to pass complex data to and from the service.
The service includes the following code: You need to verify the order in which the data is serialized.

For each of the following statements, select True if the statement is true. Otherwise, select False.

5. You create a Windows Communication Foundation (WCF) service.
You need to ensure that specific users can enable message logging for the service at runtime.
In the configuration file for the service, what should you do?

A) Enable a shared XMLTraceListener object.
B) Enable the Windows Management Instrumentation (WMI) provider.
C) Enable debug compilation.
D) Enable message logging.

Solutions: