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

1. 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 IChannelInitializer interface in the service class.
B) Set the BodyStyle parameter of the WebGet attribute on the operation to WebMessageBodyStyle.WrappedResponse.
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) Implement the System.Runtime.Serialization.IFormatterConverter interface in the service class.

2. You are integrating a Windows Communication Foundation (WCF) service within an enterprise-wide Service
Oriented Architecture (SQA)
Your service has the following service contract.
[ServiceContract]
public class CreditCardConfirmationService { [OperationContracti public Boolean ConfirmCreditCard(string cc Number double orderAmount, nmt orderNumber) { )
)
You need to allow the code in the ConfirmCreditCard method to participate automatically in existing transactions. If there is no existing transaction, a new transaction must be created automatically.
What should you do?

A) Inside the ConfirmCreditCard method, surround the code that must participate in the transaction with a using(new TransactionScopeO) block
B) Inside the ConfirmCreditCard method, surround the code that must participate in the transaction with a using(new CommittableTransactionO) block.
C) Add an [OperationBehavior(TransactionAutoComplete true)J attribute to the ConfirmCreditCard method.
D) Add an [OperationBehavior(TransactionScopeRequired true)] attribute to the ConfirmCreditCard method.

3. You are developing a Windows Communication Foundation (WCF) service that contains the following code segment.
<ServiceContract()> Public Interface ICustomerService ... End Interface Public Class CustomerService Implements ICustomerService ... End Class
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) Dim serviceAddress As Uri =
New Uri("http://contoso.com:8080/")
Dim host As ServiceHost =
New Servic eHost(GetType(CustomerService),
New Uri() {serviceAddress})
host.AddServiceEndpoint(GetType(ICustomer Service),
New BasicHttpBinding(), "CustomerService/V1")
host.AddServiceEndp oint(GetType(ICustomerService),
New BasicHttpBinding(), "CustomerService/V2")
B) Dim serviceAddress1 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V1")
Dim serviceAddress2 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V2")
Dim host As ServiceHost =
New ServiceHost(GetType(CustomerService),
New Uri() {serviceAddress1, serviceAddress2})
C) Dim serviceAddress1 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V1")
Dim serviceAddress2 As Uri =
New Uri("http://contoso.com:8080/CustomerService/V2")
Dim host As ServiceHost =
New Service Host(GetType(ICustomerService),
New Uri() {serviceAddress1, serviceAddress2})
D) Dim serviceAddress As Uri =
New Uri("http://contoso.com:8080/")
Dim host As ServiceHost =
New Service Host(GetType(ICustomerService),
New Uri() {serviceAddress})
host.AddServiceEndpoint(GetType(CustomerService),
New BasicHttpBinding(), "CustomerService/V1")
host.AddServiceEnd point(GetType(CustomerService),
New BasicHttpBinding(), "CustomerService/V2")

4. You develop a Window Communication Foundation (WCF) service. You have the following requirements: - Create a data contract to pass data between client applications and the service. - Create the data that is restricted and cannot pass between client applications and
the service. You need to implement the restricted data members. Which member access modifier should you use?

A) Protected
B) Public
C) Shared
D) Private

5. You are creating a Windows Communication Foundation (WCF) service that accepts messages from clients when they are started. The message is defined as follows.
[MessageContract]
public class Agent
{
public string CodeName { get; set; }
public string SecretHandshake { get; set; }
}
You have the following requirements:
- The CodeName property must be sent in clear text. The service must be able to verify that the property value was not changed after being sent by the client. - The SecretHandshake property must not be sent in clear text and must be readable by the service.
What should you do?

A) Add an XmlText attribute to the CodeName property and set the DataType property to Signed. Add a PasswordPropertyText attribute to the SecretHandshake property and set its value to true.
B) Add a MessageBodyMember attribute to the CodeName property and set the ProtectionLevel to Sign. Add a MessageBodyMember attribute to the SecretHandshake property and set the ProtectionLevel to EncryptAndSign.
C) Add a DataProtectionPermission attribute to the each property and set the ProtectData property to true.
D) Add an ImmutableObject attribute to the CodeName property and set its value property to true. Add a Browsable attribute to the SecretHandshake property and set its value to false.

Solutions: