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

1. 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 verity 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 Service Model trace source in the system diagnostics
configuration section.
In the system service Model configuration add the following xML segment
<diagnostics>
<message Logging log Entire Messages" true
logMessagesAtServiceLeveIetrue"
logMessagesAtTransportLeveletrue" />
</diagnostics>
B) Configure the System. Service Model trace source in the system diagnostics
configuration section.
In the system.serviceModel configuration, add the following XML segment,
<diagnostics>
<message Logging log Entire Message="
true log Messages t Service LeveI-true' Is
<diagnostics>
C) Configure the System. Service Model Message Logging trace source in the system.
diagnostics configuration section.
In the system service Model configuration, add the following xML segment
<diagnostics>
<message Logging Iog Messages At Service Levele true"
log Messages At Transport Levele"true" 1>
</diagnostics>
D) Configure the System. Service Model Message Logging trace source in the system
diagnostics
configuration sectionIn the system. service Model configuration, add the following XML
segment.
<diagnostics>
<message Logging log Entire Message='
true Iog Messages At Service LeveI true"
log Messages At Transport Level=true" I> <Idiagnostics>

2. A Windows Communication Foundation (WCF) solution uses the following contract to share a message across its clients. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 Public Interface ITeamMessageService 03 04 <OperationContract()> 05 Function GetMessage() As String 06 07 <OperationContract()> 08 Sub PutMessage(ByVal message As String) 09 End Interface The code for the service class is as follows.
10 Public Class TeamMessageService 11 Implements ITeamMessageService 12 13 Dim key As Guid = Guid.NewGuid() 14 Dim message As String = "Today s Message" 15 16 Public Function GetMessage() As String _ 17 Implements ITeamMessageService.GetMessage 18 19 Return String.Format("Message:{0}. Key:{1}", message, key) 20 End Function 21 22 Public Sub PutMessage(ByVal message As String) _ 23 Implements ITeamMessageService.PutMessage 24 25 Me.message = message 26 End Sub 27 28 End Class
The service is self-hosted. The hosting code is as follows.
29 Dim host As ServiceHost = New ServiceHost(GetType(TeamMessageService)) 30 Dim binding As BasicHttpBinding = New BasicHttpBinding(BasicHttpSecurityMode.None)
31 host.AddServiceEndpoint(
"MyApplication.ITeamMessageService", binding,
"http://localhost:12345")
32 host.Open()
You need to ensure that all clients calling GetMessage will retrieve the updated string if the message is updated by any client calling PutMessage.
What should you do?

A) Then change the implementation of PutMessage in lines 22-26 to the following.
Public Sub PutMessage(ByVal message As String) _
Implements ITeamMessageService.PutMessage
TeamMessageService.message = message
End Sub
B) Add the following attribute to the TeamMessageService class, before line 10.
<ServiceBehavior(InstanceContextMode:=InstanceContextMode.Single)>
C) Pass a service instance to the instancing code in line 29, as follows.
Dim host As ServiceHost = New ServiceHost(New TeamMessageService())
D) Add the following attribute to the TeamMessageService class, before line 10002E
<ServiceBehavior(InstanceContextMode:=
InstanceContextMode.PerSession)>
E) Redefine the message string in line 14, as follows.
Shared message As String = "Today s Message"

3. 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.)
01 <ServiceContract()> 02 Public Interface IDataCache 03
04 . . . 05 End Interface 06 07 08 Public Class DataCache 09 Implements IDataCache 10
11 . . . 12 End Class
You need to ensure that all users share the cache.
Which code segment should you insert at line 07?

A) <ServiceBehavior(InstanceContextMode:= InstanceContextMode.Single)>
B) <ServiceBehavior(TransactionIsolationLevel:= IsolationLevel.RepeatableRead)>
C) <ServiceBehavior (InstanceContextMode : = InstanceContextMode.PerSession)>
D) <ServiceBehavior(TransactionIsolationLevel:= IsolationLevel.ReadCommitted)>

4. You are developing a Windows Communication Foundation (WCF) service that reads messages from a public non-transactional MSMQ queue.
You need to configure the service to read messages from the failed-delivery queue.
Which URI should you specify in the endpoint configuration settings of the service?

A) net.msmq://localhost/msmq$;DeadLetter
B) net.msmq://localhost/system$;DeadLetter
C) net.msmq://localhost/system$;DeadXact
D) net.msmq://localhost/msmq$;FailedMessages

5. You are developing a Windows Communication Foundation (WCF) service that executes a long-running operation.
The service is accessed from your business applications in a server transaction in which the client does not participate.
You need to ensure that the transaction times out and aborts if the operation has not completed within 45 seconds.
What should you do?

A) Set the service binding receiveTimeout attribute to 00:00:45.
B) Apply <OperationBehavior (TransactionScopeRequired:=False) > to the service operation.
C) Apply OerviceBehavior (TransactlonTiitieout: = "00:00:45")> to the service
implementation.
D) Set the service binding sendTimeout attribute to 00:00:45.

Solutions: