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

1. A Windows Communication Foundation (WCF) solution uses two services to manage a shopping cart. Service A processes messages containing line items that total between $0 and $500. Service B processes messages containing line items that total more than $500.
All messages are of equal importance to the business logic.
You need to route incoming messages to the appropriate services by using WCF routing.
Which two message filters should you add to the router? (Each correct answer presents part of the solution. Choose two.)

A) a message filter with a priority of 100 that will forward messages that total between $0 and $500 to Service A
B) a message filter with a priority of 0 that will forward messages that total between $0 and $500 to Service A
C) a message filter with a priority of 0 that will forward all messages to Service B
D) a message filter with a priority of 100 that will forward all messages to Service B

2. A Windows Communication Foundation (WCF) solution exposes the following service over a TCP binding. (Line numbers are included for reference only.)

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) Change the service behavior as follows. <ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Single, InstanceContextMode:=InstanceContextMode.PerSession)>
B) Change the service behavior as follows.
<ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Multiple, InstanceContextMode:=InstanceContextMode.Single)>
C) Add a throttling behavior to the service, and configure the maxConcurrentSessions.
D) Add a throttling behavior to the service, and configure the maxConcurrentCalls.

3. 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.
void DeleteItems(string id);
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) Replace the return type with RemovedActivityAction.
B) Add the HttpDelete attribute to the operation.
C) Add the WebInvoke(UriTemplate = "/Items/{id}", Method="DELETE") attribute to the operation.
D) Replace the string parameter with a RemovedActivityAction parameter.

4. A Windows Communication Foundation (WCF) service only accepts messages that are signed and encrypted.
A client application is not receiving expected responses from the service.
You need to enable logging to verify that the messages from the client are signed and encrypted. You also need to see what each message looks like before the message body is deserialized into a .NET object.
What should you do?

A) Configure the System.ServiceModel trace source in the system.diagnostics
configuration section. In the system.serviceModel configuration, add the following XML
segment.
<diagnostics>
<messageLogging
logEntireMessage="true"
logMessagesAtServiceLevel="true"
logMessagesAtTransportLevel="true" />
</diagnostics>
B) Configure the System.ServiceModel.MessageLogging trace source in the
system.diagnostics configuration section. In the system.serviceModel configuration, add
the following XML segment.
<diagnostics>
<messageLogging
logEntireMessage="true"
logMessagesAtServiceLevel="true"
logMessagesAtTransportLevel="true" />
</diagnostics>
C) Configure the System.ServiceModel.MessageLogging trace source in the
system.diagnostics configuration section. In the system.serviceModel configuration, add
the following XML segment.
<diagnostics>
<messageLogging
logMessagesAtServiceLevel="true"
logMessagesAtTransportLevel="true" />
</diagnostics>
D) Configure the System.ServiceModel trace source in the system.diagnostics
configuration section. In the system.serviceModel configuration, add the following XML
segment.
<diagnostics>
<messageLogging logEntireMessage="true" logMessagesAtServiceLevel="true" /> </diagnostics>

5. A self-hosted Windows Communication Foundation (WCF) service uses a secure HTTP
binding with a custom principal permission mode. The binding requires users to provide their Windows logon credentials.
You need to retrieve the identity of the caller.
What are two possible properties you can use to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Thread.CurrentPrincipal.Identity-Name
B) OperationContext.Current.ServiceSecurity Context.Primary Identity.Name
C) HttpContext.Current.User.Identity.Name
D) ServiceSecurity Context.Current.Primary Identity.Name

Solutions: