MCTS Windows Communication Foundation (WCF) 3

Question 1

In IIS-hosted WCF services, what is the purpose of a .svc file?

Accepted Answer

It is the entry point that IIS uses to activate and route requests to the correct WCF service type

Answer

The .svc file provides the Factory and Service directives that tell IIS/WAS which class implements the WCF service and how to activate it.

Question 2

Which WCF binding provides built-in support for WS-ReliableMessaging to guarantee ordered, exactly-once message delivery?

Accepted Answer

WSHttpBinding

Answer

WSHttpBinding supports WS-ReliableMessaging, which adds a reliability session layer ensuring messages arrive in order and exactly once even over unreliable networks.

Question 3

What does the [OperationContract(IsOneWay = true)] attribute setting do for a WCF service method?

Accepted Answer

It configures the method so the client sends a message and does not wait for a reply

Answer

IsOneWay = true configures the operation as fire-and-forget; the client sends the message and immediately continues without waiting for any response from the service.

Question 4

Which WCF configuration element controls the maximum number of concurrent calls, sessions, and instances a service can handle?

Accepted Answer

serviceThrottling

Answer

The serviceThrottling behavior lets you set MaxConcurrentCalls, MaxConcurrentSessions, and MaxConcurrentInstances to prevent resource exhaustion under load.

Question 5

What interface must a class implement to create a custom WCF message inspector that inspects or modifies messages before they are processed?

Accepted Answer

IDispatchMessageInspector

Answer

IDispatchMessageInspector provides AfterReceiveRequest and BeforeSendReply hooks that allow you to inspect or modify incoming requests and outgoing replies at the service dispatcher level.

(MCTS) Microsoft Certified Technology Specialist Practice Test

(MCTS) Microsoft Certified Technology Specialist Practice Test

MCTS Windows Communication Foundation (WCF) 3