You are creating a Windows Communication Foundation (WCF) service that implements operations in a RESTful manner. You need to add a delete operation.
You implement the delete method as follows.
Sub DeleteItems (ByVol id As String)
You need to configure WCF to call this method when the client calls the service with the HTTP DELETE operation.
What should you do?

• A. Add the WebInvoke(UriTemplate: = "/Items/{id>", Method: = "DELETE") attribute to the operation.
• B. Change the Sub statement to Function and specify RemovedActivityAction as the return type.
• C. Replace the string parameter with a RemovedActivityAction parameter.
• D. Add the HttpDelete attribute to the operation.

You are creating a Windows Communication Foundation (WCF) service that responds using plain-old XML (POX).
You have the following requirements:
- You must enable the /catalog.svc/items operation to respond using the POX, JSON, or ATOM formats. You also must ensure that the same URL is used regardless of the result type.
- You must determine the response format by using the Accepts HTTP header.
What should you do?

• A. Implement the System.Runtime.Serialization.IFormatterConverter interface in the service class.
• B. Implement the IChannelInitializer interface in the service class.
• C. Set the return type of the operation to System.ServiceModel.Channels.Message. Use the current WebOperationContext methods to return the data in the required format.
• D. Set the BodyStyle parameter of the WebGet attribute on the operation to WebMessageBodyStyle.WrappedResponse.

You are configuring services to be discoverable. The services must be discoverable without relying on a central server. Client applications that consume the services are on a network segment that is separate from the network segment that the services are located on.
A firewall blocks all TCP ports between the two network segments, but allows other protocols to pass through.
You need to ensure that the client applications can discover the services.
What should you do?

• A. Use ad-hoc discovery mode over HTTP.
• B. Use managed discovery mode over HTTP.
• C. Use ad-hoc discovery mode over UDP.
• D. Use managed discovery mode over UDP.

You are developing a Windows Communication Foundation (WCF) service. The service configuration file has a <System.Diagnostics> element defined.
You need to ensure that all security audit information, trace logging, and message logging failures are recorded.
Which configuration segment should you add to the <System.Diagnostics> element?

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

You are developing an application to update a users social status. You need to consume the service using Windows Communication Foundation (WCF).
The client configuration is as follows.
<system.serviceModel>
<bindings>
<webHttpBinding>
<binding name="SocialConfig">
<security mode="TransportCredentialOnly">
<transport clientCredentialType="Basic"
realm="Social API" />
</security>
</binding>
</webHttpBinding>
</bindings>
<client>
<endpoint address="http://contoso.com"
binding="webHttpBinding"
bindingConfiguration="SocialConfig"
contract="ISocialStatus"
name="SocialClient" />
</client>
</system.serviceModel>
The service contract is defined as follows.
[ServiceContract] public interface ISocialStatus {
[OperationContract]
[WebInvoke(UriTemplate =
"/statuses/update.xml?status={text}")]
void UpdateStatus(string text);
}
Which code segment should you use to update the social status?

• A. using (WebChannelFactory<ISocialStatus> factory =
  new WebChannelFactory<ISocialStatus>("SocialClient"))
  {
  factory.Credentials.UserName.UserName = user.Name;
  factory.Credentials.UserName.Password = user.Password;
  ISocialStatus socialChannel = factory.CreateChannel();
  socialChannel.UpdateStatus(newStatus);
  }
• B. using (ChannelFactory<ISocialStatus> factory =
  new ChannelFactory<ISocialStatus>("POST"))
  {
  factory.Credentials.Windows.ClientCredential.UserName =
  user.Name;
  factory.Credentials.Windows.ClientCredential.SecurePassword.
  SetAt(0, Convert.ToChar(user.Password) );
  ISocialStatus socialChannel = factory.CreateChannel();
  socialChannel.UpdateStatus(newStatus); }
• C. using (WebChannelFactory<ISocialStatus> factory =
  new WebChannelFactory<ISocialStatus>(typeof(ISocialClient)))
  {
  factory.Credentials.Windows.ClientCredential.UserName =
  user.Name;
  factory.Credentials.Windows.ClientCredential.SecurePassword.
  SetAt(0, Convert.ToChar(user.Password) );
  ISocialStatus socialChannel = factory.CreateChannel();
  socialChannel.UpdateStatus(newStatus); }
• D. using (ChannelFactory<ISocialStatus> factory =
  new WebChannelFactory<ISocialStatus>(typeof(ISocialStatus)))
  {
  factory.Credentials.UserName.UserName = user.Name;
  factory.Credentials.UserName.Password = user.Password;
  ISocialStatus socialChannel = factory.CreateChannel();
  socialChannel.UpdateStatus(newStatus);
  }