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

1. DRAG DROP
You develop a Windows Communication Foundation (WCF) service that uses the SOAP protocol.
You must secure the service by using Kerberos authentication for the transport layer. The SOAP messages must be authenticated by using a Security Assertion Markup Language (SAML) token.
You need to configure the service configuration file.
How should you complete the relevant markup? (To answer, drag the appropriate markup segment to the correct locations in the answer area. Each markup segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

2. You are using tracing to diagnose run-time issues when you look at the traces for the service in Svc Trace viewer exe, you see what is shown in the exhibit (Click the Exhibit button)

The exception trace is selected in Svc Trace reviewer exe.
You need to interpret the trace results to determine where the error occurred and what to do next.
What should you do?

A) This issue occurred at the ServiceHost when accepting an initial set of messages from MSMQ.Log all messages sent between the clients and sever.
B) This issue occurred at the Service Host when receiving a message Compare the security configurations on the client and server to make sure that they are compatible
C) This issue occurred in the Service Host during Service Host. Open. Compare the security settings for any endpoints that use an MSMQ transport to the security configuration of the MSMQ queue used by the endpoint
D) This issue occurred in the ServiceHost during ServiceHost Open. Enable WMI by adding the following configuration to the system.serviceModel configuration section in the application configuration file <diagnostics wmiProviderEnabledetrue'!> Restart the application and inspect the endpoints visible through WMI

3. A service implements the following contract. (Line numbers are included for reference only.)

The service is implemented as follows.

ContosoService uses NetMsmqBinding to listen for messages. The queue was set up to use transactions for adding and removing messages.
You need to ensure that OperationOne and OperationTwo execute under the same transaction context when they are invoked in the same session.
What should you do?

A) Add the following XML segment to the application config file in the
system.serviceModel/bindings configuration section.
<netMsmqBinding>
<binding name="contosoTx" durable="true" receiveContextEnabled="true" />
</netMsmqBinding>
Then use the NetMsmqBinding named contosoTx to listen for messages from the clients.
B) Add the following XML segment to the application config file in the
system.serviceModel/bindings configuration section.
<customBinding>
<binding name="contosoTx">
<transactionFlow />
<binaryMessageEncoding />
<msmqTransport durable="true" />
</binding>
</customBinding>
Then use the CustomBinding named contosoTx to listen for messages from the clients.
C) Insert the following attribute to OperationOne on ContosoService.
[OperationBehavior(TransactionScopeRequired = true,
TransactionAutoComplete = false)]
Insert the following attribute to OperationTwo on ContosoService.
[OperationBehavior(TransactionScopeRequired = true, TransactionAutoComplete = true)]
D) Insert the following attribute to OperationOne on IContosoService.
[TransactionFlow(TransactionFlowOption.Mandatory)]
Insert the following attribute to OperationTwo on IContosoService.
[TransactionFlow(TransactionFlowOption.Mandatory)]

4. You are creating a Window s Communication Foundation (WCF) service application. The
application needs to service many clients and requests simultaneously. The application also needs to ensure subsequent individual client requests provide a stateful conversation.
You need to configure the service to support these requirements.
Which attribute should you add to the class that is implementing the service?

A) [ ServiceBehavior ( InstanceContextMode =
InstanceContextMode.PerCall,
ConcurrencyMode = ConcurrencyMode.Multiple )]
B) [ ServiceBehavior ( InstanceContextMode =
InstanceContextMode.PerCall,
ConcurrencyMode = ConcurrencyMode.Reentrant )]
C) [ ServiceBehavior ( InstanceContextMode =
InstanceContextMode.PerSession,
ConcurrencyMode = ConcurrencyMode.Multiple )]
D) [ ServiceBehavior ( InstanceContextMode =
InstanceContextMode.PerSession,
ConcurrencyMode = ConcurrencyMode.Single )]

5. You are developing a Windows Communication Foundation (WCF) service. The following code defines and implements the service. (Line numbers are included for reference only.)

You need to ensure that two identical copies of the received message are created in the service.
Which code segment should you insert at line 12?

A) Message msgCopy = message;
Message returnMsg = message;
B) MessageBuffer buffer = message.
CreateBufferedCopy(8192);
Message msgCopy = buffer.CreateMessage();
Message returnMsg = buffer.CreateMessage();
C) MessageBuffer buffer = message.
CreateBufferedCopy(8192);
Message msgCopy = buffer.CreateMessage();
Message returnMsg = msgCopy;
D) Message msgCopy = message.
CreateBufferedCopy(8192) as Message;
Message returnMsg = message.
CreateBufferedCopy(8192) as Message;

Solutions:

Question # 1 Answer: Only visible for members

Question # 2 Answer: C

Question # 3 Answer: C

Question # 4 Answer: C

Question # 5 Answer: B