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Microsoft TS: Microsoft .NET Framework 3.5 C Windows Communication Foundation Sample Questions:

1. You are creating a client application by using Microsoft .NET Framework 3.5. The application will be accessible on the Internet.
You plan to use the wsHttpBinding binding by using HTTPS. The Windows Communication Foundation (WCF) service is hosted by a Windows service. You associate the HTTPS port of the WCF server with an X.509 certificate.
You need to ensure that the client application trusts and validates the certificate.
What should you do?

A) Subscribe to the ServerCertificateValidationCallback event of the System.Net.ServicePointManager class.
Write the validation code in the boolValidate(object sender, X509Certificate cert, X509Chain chain. System.Net.Security .SslPolicyErrors error) event handler on the server side.
B) Subscribe to the ServerCertificateValidationCallback event of the System.Net.ServicePointManager class.
Write the validation code in the boolValidate(object sender, X509Certificate cert, X509Chain chain. System.Net.Security.SslPolicyErrors error) event handler on the client side.
C) Derive a class from the System.IdentityModel.Selectors.X509CertificateValidator class.
Create an instance of the derived class on the client side.
Write the validation code in the public override void Validate(X509Certificate2 certificate) method.
D) Derive a class from the System.IdentityModel.Selectors.X509CertificateValidator class.
Create an instance of the derived class on the server side.
Write the validation code in the public override void Validate(X509Certificate2 certificate) method.

2. You are creating a Windows Communication Foundation service by using Microsoft .NET Framework 3.5. The service contains the following code segment.
<ServiceContract0> _ Public Interface IMyService
<OperationContract(lsOneWay:=True, _ Protectionl_evel:=Protectionl_evel.None)> _ <TransactionFlow(TransactionFlowOption.Allowed)> _ Sub DoSomethingQ End Interface
You need to ensure that the DoSomething operation can participate in transactions.
Which code segment should you use to replace the existing operation contract?

A) <OperationContract(_ Protectionl_evel:=Protectionl_evel.EncryptAndSign)> _ <TransactionFlow(TransactionFlowOption.NotAllowed)> _ Sub DoSomethingQ
B) <OperationContract(_ Protectionl_evel:=Protectionl_evel.None)> _ <TransactionFlow(TransactionFlowOption.Allowed)> _ Sub DoSomethingO
C) <OperationContract(lsOneWay:=True,_ Protectionl_evel:=Protectionl_evel. EncryptAndSign)> _ <TransactionFlow(TransactionFlowOption.Allowed)> _ Sub DoSomethingQ
D) <OperationContract(lsOneWay:=True, _ Protectionl_evel:=Protectionl_evel.Sign)> _ <TransactionFlow(TransactionFlowOption.Mandatory)> _ Sub DoSomethingQ

3. You are creating a Windows Communication Foundation (WCF) service by using Microsoft .NET Framework 3.5.
The WCF service must authenticate the client applications by validating credit card numbers and expiry dates. You write the following code segment. (Line numbers are included for reference only.)
01 class CreditCardTokenAuthenticator: SecurityTokenAuthenticator
02 {
03 // Implementation of other abstract methods comes here.
04 protected override ReadOnlyCollection<IAuthorizationPolicy> ValidateTokenCore(SecurityToken token)
05 {
06 CreditCardToken creditCardToken = token as CreditCardToken;
07 }
09 private bool IsCardValid(string cardNumber, 13 DateTime expirationDate)
10 {
11 // Validation code comes here.
12 }
13 }
You need to implement custom authentication for the WCF service. Which code segment should you insert at line 07?

A) if (IsCardValid(creditCardToken.CardNumber, creditCardToken.ValidTo))
return new List<IAuthorizationPolicy>(0).AsReadOnly();
else
return null;
B) if (IsCardValid(creditCardToken.CardNumber, creditCardToken.ValidTo))
throw new SecurityTokenValidationException();
else
return null;
C) if (IsCardValid(creditCardToken.CardNumber, creditCardToken.ValidTo))
return null;
else
return new List<IAuthorizationPolicy>(0).AsReadOnly();
D) if (IsCardValid(creditCardToken.CardNumber, creditCardToken.ValidTo))
return null;
else
throw new SecurityTokenValidationException();

4. You are creating a Windows Communication Foundation (WCF) service by using Microsoft .NET Framework 3.5.
You need to use a custom service host to host the WCF service in Windows Activation Services (WAS).
What should you do?

A) Add code to instantiate the custom service host from within the main procedure of the WCF service.
B) Write hosting code for the WCF service.
C) Add a reference to the custom service host in the web.config file.
D) Create a custom service host factory that instantiates the custom service host. Include a reference to this factory in the .svc file.

5. You are creating a remote database management application by using Microsoft Windows Forms and Microsoft .NET Framework 3.5. You use the Windows
Communication Foundation model to create the application. You write the following code segment. (Line numbers are included for reference only.)
01 public class QueryAnalyzerService :
02 IQueryAnalyzerService, IDisposable {
04 public void Open() {
05}
06 public void ExecuteSql(string sql) {
07...
08!
09 public void Close() {
10...
11}
12 public void Disposed
13...
14}
15...
16}
You need to ensure that each time a client application calls the Open0 method, a new service instance is created. Which code segment should you insert at line 03?

A) [OperationBehavior( AutoDisposeParameters=true)]
B) [OperationBehavior( ReleaselnstanceMode=ReleaselnstanceMode.None)]
C) [OperationBehavior( TransactionScopeRequired=true)]
D) [OperationBehavior( ReleaselnstanceMode=ReleaselnstanceMode.BeforeCall))

Solutions: