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

1. 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) ]

2. You are creating a Windows Communication Foundation (WCF) service that uses claims-based authorization. The following code retrieves the correct claim set.
var claims = ServiceSecurityContext.Current.
AuthorizationContext.ClaimSets[0];
You need to validate that the requesting client application has included a valid DNS value in the claim.
Which code segment should you use to retrieve the claim for validation?

A) claims.ContainsClairo(Claim.CreateDnsClaim(ClaimTypes.Dns));
B) claims.FindClaims(ClaimTypes.Dns, Rights.Identity) .FirstOrDefault();
C) claims.Equals(ClaimTypes.Dns);
D) claims.FindClaims(ClaimTypes.Dns, Rights.PossessProperty) .FirstOrDefault();

3. A Windows Communication Foundation (WCF) service listens for messages at net
tcpilwwwcontoso.comMMyService.
It has a logical address at http/Iwwwcontosocorn)MyService
The configuration for the WCF client is as follows
<endpoint addressrhTttpllwwwcontosocom/MyService"
bindinge"netTc pBinding"
bindingConfiguraton-NetTc pBinding_lMyService
contract="ServiceReference 1. IMyServce'
name='NetTcpBinding_lllyService"/>v
The generated configuration does not provide enough information for the client to communicate with the server.
You need to update the client so that it can communicate with the server what should you do

A) After instantiating the client and before invoking any service operation, add this line of code client Endpoint BehaviorsAdd( new EndpointDiscoveryBehawior0{ Enabled true });
B) In the client configuration, change the value of the address attribute to net.tcp:Ilwwwcontosocom/MyServicellisten=http:/Iwwwcontosocom/MyService.
C) After instantiating the client and before invoking any service operation, add this line of code. client. Endpoint BehaviorsAdd( new Client ViaBehavior( new Uhcnet.tc pifwww.contoso. comiIMyService)))
D) In the client configuration. Change the value of the address attribute to nettcp:/Iwwwcontosocom/MyService

4. A Windows Communication Foundation (WC9 service implements a contract with one-way and requestreply operations.
The service is exposed over a TCP transport Clients use a router to communicate with the service. The router is impemented as follows.
(Line numbers are included for reference only.)
01 Dim host As ServiceHost = 02 New ServiceHost(GetType(RoutingService)) 03 hostAddServiceEndpoint(
04 GetType(lSimplexDatagramRouter),
05 New NetTcpBinding0, "net.tcp://localhostlRouter"
06)
07 Dim lep As List(Of ServiceEndpoint) =
08 New List(Of SenviceEndpointx)
09 lepAdd(
10 New ServiceEndpoint(
11 CortractDescription.GetContract(
12 GetType(lSimplexDatagramRouter)
13)1
14 New NetTcpBinding0,x
15 New EndpointAddressf'nettcp://localhost:8080/Logger')
16)
17)
18 Dim rc As RoutingConfiguration = New RoutingConfiguration()
19 rc . FitterTable.Add(New Matctf4llMessageFilter0, lep)
20 host. Description. Behaviors.Add(New RoutingBehavior(rc)) Request-reply operations
are failing.
You need to ensure that the router can handle one-way and request-reply operations.
What should you do?

A) Change line 12 as follows.
Get Type(IDuplexSessionRouter)
B) Change line 12 as follows
GetType(lRequestReplyRouter)
C) Change line 04 as follows
Get Type(lDuplexSessionRouter),
D) Change line 04 as follows.
Get Type(lRequestReplyRouter),

5. 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 verify 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.ServiceModel.MessageLogging trace source in the
system.diagnostics configuration section. In the system.serviceModel configuration, add
the following XML segment.
<diagnostics>
<messageLogging
logMessagesAtServiceLevel="true"
logMessagesAtTransportLevel="true" />
</diagnostics>
B) Configure the System.ServiceModel.MessageLogging trace source in the
system.diagnostics configuration section. In the system.serviceModel configuration, add
the following XML segment.
<diagnostics>
<messageLogging
logEntireMessage="true"
logMessagesAtServiceLevel="true"
logMessagesAtTransportLevel="true" />
</diagnostics>
C) Configure the System.ServiceModel trace source in the system.diagnostics
configuration section. In the system.serviceModel configuration, add the following XML
segment.
<diagnostics>
<messageLogging logEntireMessage="true" logMessagesAtServiceLevel="true" /> </diagnostics>
D) Configure the System.ServiceModel trace source in the system.diagnostics
configuration section. In the system.serviceModel configuration, add the following XML
segment.
<diagnostics>
<messageLogging
logEntireMessage="true"
logMessagesAtServiceLevel="true"
logMessagesAtTransportLevel="true" />
</diagnostics>

Solutions:

Question # 1 Answer: A

Question # 2 Answer: D

Question # 3 Answer: C

Question # 4 Answer: C

Question # 5 Answer: B