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

1. You develop a Windows Communication Foundation (WCF) service to generate reports. Client applications call the service to initiate report generation but do not wait for the reports to be generated. The service does not provide any status to the client applications.
The service class is defined as follows. (Line numbers are included for reference only.)
01 <ServiceContract()> 02 Public Class ReportGeneratorService 03 04 Private Function GenerateReports( ByVal clientID As Integer) As Integer 05 & 06 Return 0 07 End Function 08 09 End Class
You need to ensure that client applications can initiate reports without waiting for status.
Which two actions should you perform (Each correct answer presents part of the solution. Choose two.)

A) Insert the following code at line 03. <OperationContract(IsOneWay:=True)>
B) Remove line 06. At line 04, change the type of GenerateReports method to Sub. Remove the code As Integer from the method definition.
C) At line 04, change the GenerateReports method from Private to Public.
D) Insert the following code at line 03. <OperationContract(AsyncPattern:=False)>

2. A WCF service code is implemented as follows. (Line numbers are included for reference only.)
01 [ServiceContract] 02 [ServiceBehavior(InstanceContextMode = 03 InstanceConcextMode.Single)]
04 public class CalculatorService
05 {
06 [OperacionContract]
07 public double Calculate(double opl, string op, double op2)
08 {
...
24 }
25 }
You need to decrease the response time of the service.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

A) Require the clients to use async operations when calling the service.
B) Change the service behavior to the following.
[ServiceBehavior(
InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode =
ConcurrencyMode.Multiple) ]
C) Require the clients use threads, the Parallel Task Library, or other mechanism to issue
service calls in parallel.
D) Change the service behavior to the following.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall) ]

3. You are developing a Windows Communication Foundation (WCF) client application.
You instantiate a client class that inherits from ClientBase. The client instance must always be shut down in such a way that it can free up any resources it is referencing. You need to ensure that all exceptions are caught and the instance is always properly shut
down.
Which code segment should you use?

A) Option D
B) Option A
C) Option C
D) Option B

4. You are developing a Windows Communication Foundation (WCF) service that does not operate on a duplex channel.
You find that operations do not start until all previous operations have finished. The service hosting code contains the following lines.
var service = new WarehouseService();
var host = new ServiceHost(service);
You need to ensure that new operations do not wait for previous operations to finish.
Which attribute should you use to decorate the service?

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

5. You develop a Windows Communication Foundation (WCF) service. It is used exclusively as an intranet application and is currently unsecured.
You need to ensure that the service meets the following requirements:
The service now must be exposed as an Internet application.
The service must be secured at the transport level.
Impersonation and delegation cannot be enabled.
What should you use?

A) basicHttpBinding and HTTP
B) wsHttpBinding and Kerberos
C) wsHttpBinding and HTTPS
---
D) basicHttpBinding and Kerberos

Solutions: