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

1. You are developing a client that sends several types of SOAP messages to a Windows Communication Foundation (WCF) service method named PostData.
PostData is currently defined as follows.
[OperationContract]
void PostData(Order data);
You need to modify PostData so that it can receive any SOAP message.
Which code segment should you use?

A) [OperationContract] void PostData(BodyWriter data);
B) [OperationContract(IsOneWay = true, Action = "*", ReplyAction = "*")] void PostData(Order data);
C) [OperationContract] void PostData(Message data);
D) [OperationContract(IsOneWay = true, Action = "*", ReplyAction = "*")] void PostData(BodyWriter data);

2. You are developing an application to update a user s 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.xmlstatus={text}")>
Sub UpdateStatus(ByVal text As String)
End Interface
Which code segment should you use to update the social status?

A) Using factory As WebChannelFactory(Of ISocialStatus) =
New WebChannelFactory(Of ISocialStatus)("SocialClient")
factory.Credentials.UserName.UserName = user.Name
factory.Credentials.UserName.Password = user.Password
Dim socialChannel As ISocialStatus = factory.CreateChannel()
socialChannel.UpdateStatus(newStatus)
End Using
B) Using factory As ChannelFactory(Of ISocialStatus) =
New WebChannelFactory(Of ISocialStatus)(GetType(ISocialStatus))
factory.Credentials.UserName.UserName = user.Name
factory.Credentials.UserName.Password = user.Password
Dim socialChannel As ISocialStatus = factory.CreateChannel()
socialChannel.UpdateStatus(newStatus)
End Using
C) Using factory As ChannelFactory(Of ISocialStatus) =
New ChannelFactory(Of ISocialStatus)("POST")
factory.Credentials.Windows.ClientCredential.UserName =
user.Name
factory.Credentials.Windows.ClientCredential.SecurePassword.SetAt(
0, user.Password)
Dim socialChannel As ISocialStatus = factory.CreateChannel()
socialChannel.UpdateStatus(newStatus)
End Using
D) Using factory As WebChannelFactory(Of ISocialStatus) =
New WebChannelFactory(Of ISocialStatus)(GetType(ISocialClient))
factory.Credentials.Windows.ClientCredential.UserName =
user.Name
factory.Credentials.Windows.ClientCredential.SecurePassword.SetAt(
0, user.Password)
Dim socialChannel As ISocialStatus = factory.CreateChannel()
socialChannel.UpdateStatus(newStatus)
End Using

3. You develop a Windows Communication Foundation (WCF) service that uses basic authentication for client credentials. This service is currently configured to use message security.
The service is hosted on a server in workgroup mode.
Users report that their passwords are stolen when they use public computers. You need to ensure that messages are secure and users are authenticated.
You prevent the service from being called over HTTP through Microsoft Internet Information Services (IIS) configuration.
What should you do next?

A) Use the message security mode and specify Basic for the transport client credential type.
B) Use the transportWithMessageCredential security mode and specify None for the transport client credential type.
C) Use the transport security mode and specify None for transport client credential type.
D) Use the transportWithMessageCredential security mode and specify Basic for the transport client credential type.

4. You are implementing a Windows Communication Foundation (WCF) client application that consumes the ICatalog and lCatalog2 service interfaces
You need to ensure that the client discovers services implementing these interfaces
The services may already be online or may come online within a 30 second time limit
How should you use WCF Discovery to accomplish this?

A) Create one FindCriteria object for each interface and set the Duration of each
FindCriteria to 30 seconds Call the FindAsync method of the DiscoveryClient class twice,
one time for each of the FindCriteria objects, to search for the services.
B) Create one FindCriteria object for each interface and set the Duration of each
FindCriteria to two seconds.
Create a loop that calls the Find method of the DiscoveryClient class to search for the
services.
Within each loop iteration, call the Find method of the DiscoveryClient class once for each
of the FindCriteria objects Run the loop until a service is found or 30 seconds pass.
C) Create a single FindCritera object and add both interfaces to the ContractTypeNames
collection. Set the Duration to 30 seconds and use the FindAsync method of the
DiscoveryClient class to search for the services.
D) Create a single FindCriteria object and add both interfaces to its ContractTypeNames
collection. Set the criteria's Duration to two seconds.
Create a loop that calls the Find method of the DiscoveryClient class to search for the
services.
Within each loop iteration, call the Find method of the DiscoveryClient class to search for
the services Run the loop until a service is found or 30 seconds pass.

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 a DataProtectionPermission attribute to the each property and set the ProtectData property to true.
B) 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.
C) 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.
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: