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

1. A Windows Communication Formation (WCF) client and service share the following service contract interface
<ServiceContractO>
Public Interface IContosoService <OperationContractO>
Sub SasePerson(BWal person As Person) End Interface They also use the following
binding.
Dim binding As NetTcpBinding = New NetTcpBinding With {TransactionFlow = True) The
client cals the service with the (following code using (mransactionScope ts = new
TransactionScope(TransactionScopeOption
Required))
{
IContosoService client = factoryCreateChannelO;
client SavePerson(person);
Consde. WriteLine(
Transaction. CurreriTransactioninformation
DistnbutedldentifierX
ts CorrpleteO;
)
The service has the following impementation for SavePerson
Public Sub SavePerson(ByVal person As Perwn) - implements IContosoService
SavePerson person Save()
ConsdeWriteLine(Transaction .Current Transactionlnformaiona
Distributedldentifier)
End Sit
The distributed identifiers do not match on the client and the server.
You need to ensure that the client and server enlist in the same distributed transaction
What should you do?

A) Add the following attributes to the SavePerson operation on lContosoService
eOperationBehavior(TransactionSc opeRequired =True)>
<TransactionFlow(TransactionFbwOption Madatory)>
B) Add the following attributes to the SavePerson operation on IContosoSewvice
<TransactionFlow(TransactionFbwOption Maidatory)>
eOperationBehavior(TransactionSc opeRequired zTrue)>
C) Add the following attribute to the SavePerson operation on KOontosoService.
<TransactionFlow(TransactionFbwOption Allowed)>
Add the following attribute to the implementation of SavePeson.
eOperationBehavior(TransactionSc
opeRequired True)>
D) Add the following attribute to the SavePerson operation on KContosoService.
<OperationBehavior(TransachonSc opeRequired True)>
Add the following attribute to the implementation of SavePeson.
<TransactionFlow(TransactionFbwOption
Allowed)>

2. You have an existing Windows Communication Foundation (WCF) service.
You need to ensure that other services are notified when the service is started.
What should you do?

A) Add a service behavior with the following element.
<serviceDiscovery>
<announcementEndpoints>
<endpoint kind="udpAnnouncementEndpoint" />
</announcementEndpoints>
</serviceDiscovery>
B) Add the following standard endpoint to the service.
<endpoint name="udpAnnouncementEndpoint"
kind="udpDiscoveryEndpoint" />
C) Add a service behavior with the following element.
<serviceDiscovery>
<announcementEndpoints>
<endpoint kind="udpDiscoveryEndpoint" />
</announcementEndpoints>
</serviceDiscovery>
D) Add the following standard endpoint to the service.
<endpoint name="udpDiscoveryEndpoint"
kind="udpAnnouncementEndpoint" />

3. A Windows Communication Foundation (WCF) service exposes two operations: OpA and OpB OpA needs to execute under the client's identity, and OpB needs to execute under the service's identity.
You need to configure the service to run the operations under the correct identity
What should you do?

A) Set the ImpersonateCallerForAllOperations property of the service's
ServiceAuthorizationBehavior to true.
Apply an OperationBehavior attribute to OpA and set the Impersonation property to
ImpersonationOption.Allowed
Apply an OperationBehavior attribute to OpB and set the Impersonation property to
ImpersonationOption
NotAllowed
B) Set the ImpersonateCallerForAllOperations property of the service's ServiceAuthorizationBehavior to true. Apply an OperationBehavior attribute to OpA and set the Impersonation property to ImpersonationOption Required Apply an OperationBehavior attribute to OpB and set the Impersonation property to ImpersonationOptionAulowed.
C) Set the ImpersonateCallerForAllOperations property of the service's
ServiceAuthorizationBehavior to false.
Apply an OperationBehavior attribute to OpA and set the Impersonation property to
ImpersonationOptionAllowed.
Apply an OperationBehavior attribute to OpB and set the Impersonation property to
ImpersonationOption
NotAllowed
D) Set the ImpersonateCallerForAllOperations property of the service's
ServiceAuthorizationBehavior to false.
Apply an OperationBehavior attribute to OpA and set the Impersonation property to
lmpersonationOption.Required.
Apply an OperationBehavior attribute to OpB and set the Impersonation property to
ImpersonationOption.Allowed.

4. A Windows Communication Foundation (WCF) service uses a list of application-defined
roles for operations.
These roles are stored in a database.
You need to authorize calls against the list of roles retrieved from the database.
Which service behavior should you use to authorize the calls?

A) <serviceAuthorization principalPermissionModez"None" roleProviderNames"SqlProvider" />
B) <serviceAuthorization principalPermissionModes"None" roleProviderNames"SqlProvider" I>
C) <serviceAuthorization principalPermissionMode="None" roleProviderNamee"SqlProvider" Is
D) <serviceAuthorization principalPermissionModez"None" roleProviderNamez'SqlProvider" />

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

Solutions: