You are developing a Windows Communication Foundation (WCF) service to provide an in-memory cache for many Web applications. The service contract is defined as follows. (Line numbers are included for reference only.)

You need to ensure that all users share the cache.
Which code segment should you insert at line 07?

• A. [ServiceBehavior(TransactionlsolationLevel = IsolationLevel.ReadCoromitted)]
• B. [ServiceBehavior(TransactionlsolationLevel = IsolationLevel.RepeatableRead)]
• C. [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
• D. [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]

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

An ASP NET application hosts a RESTful Windows Communication Foundation (WCF)
service at /ServiceslContoso.svc.
The service provides a JavaScript resource to clients. You have an explicit reference to the
JavaScript in your page markup as follows.
<script type = text/javaScript' srcsIServices/Contoso. svc/js" /> You need to retrieve the debug version of the service JavaScript. What should you do?

• A. In the <%@ ServiceHost %> header for /ServiceslContoso.svc, set the Debug attribute to true.
• B. In the <%@ Page %s header, set the Debug attribute to true.
• C. In the script tag, add a debug attribute and set its value to true.
• D. In the script tag, append debug to the src attribute

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 A
• B. Option C
• C. Option B
• D. Option D

You are developing a Windows Communication Foundation (WCF) service that contains the following code segment.
[ServiceContract ] public interface ICustomerService { & }
public class CustomerService : ICustomerService { & }
The service is self-hosted in a console application. Older client applications access the service at http://contoso.com:8080/CustomerService/V1. Newer client applications access the service at http://contoso.com:8080/CustomerService/V2.
You need to ensure that any client application can access the service at either address.
Which code segment should you use?

• A. Uri serviceAddress =
  new Uri("http://contoso.com:8080/");
  ServiceHost host =
  new ServiceHost(typeof(ICustomerService),
  new Uri[] { serviceAddress });
  host.AddServiceEndpoint(typeof(CustomerService),
  new BasicHttpBinding(), "CustomerService/V1");
  host.AddServiceEndpoint(typeof(CustomerService),
  new BasicHttpBinding(), "CustomerService/V2");
• B. Uri serviceAddress =
  new Uri("http://contoso.com:8080/");
  ServiceHost host =
  new ServiceHost(typeof(CustomerService),
  new Uri[] { serviceAddress });
  host.AddServiceEndpoint(typeof(ICustomerService),
  new BasicHttpBinding(), "CustomerService/V1");
  host.AddServiceEndpoint(typeof(ICustomerService),
  new BasicHttpBinding(), "CustomerService/V2");
• C. Uri serviceAddress1 =
  new Uri("http://contoso.com:8080/CustomerService/V1");
  Uri serviceAddress2 =
  new Uri("http://contoso.com:8080/CustomerService/V2");
  ServiceHost host =
  new ServiceHost(typeof(ICustomerService),
  new Uri[] { serviceAddress1, serviceAddress2 });
• D. Uri serviceAddress1 =
  new Uri("http://contoso.com:8080/CustomerService/V1");
  Uri serviceAddress2 =
  new Uri("http://contoso.com:8080/CustomerService/V2");
  ServiceHost host =
  new ServiceHost(typeof(CustomerService),
  new Uri[] { serviceAddress1, serviceAddress2 });