MCSD Windows Communication Foundation (WCF) 3

Question 1

Which WCF security mode encrypts messages using WS-Security standards regardless of the transport used?

Accepted Answer

Message

Answer

Message security mode applies encryption and signing at the SOAP message level using WS-Security, providing end-to-end security independent of the transport.

Question 2

What is the purpose of the WCF ChannelFactory<T> class?

Accepted Answer

Creates typed client channels to call a WCF service without a generated proxy

Answer

ChannelFactory<T> creates communication channels that implement a service contract interface, allowing strongly-typed service calls without a generated proxy class.

Question 3

Which WCF feature allows you to intercept and inspect messages as they flow through the channel stack?

Accepted Answer

Message inspectors (IDispatchMessageInspector / IClientMessageInspector)

Answer

Message inspectors implement IDispatchMessageInspector (service side) or IClientMessageInspector (client side) to read, log, or modify SOAP messages in the channel pipeline.

Question 4

What does a [FaultContract] attribute on a WCF operation enable?

Accepted Answer

Declares a typed SOAP fault that the operation may return to the client

Answer

[FaultContract] declares that an operation can return a specific typed SOAP fault detail, giving clients a strongly-typed way to handle service-side errors.

Question 5

Which WCF throttling setting limits the maximum number of concurrent service instances active at any time?

Accepted Answer

MaxConcurrentInstances

Answer

MaxConcurrentInstances limits the total number of InstanceContext (service instance) objects that can exist simultaneously across all sessions and calls.

MCSD Exam Practice Test

MCSD Exam Practice Test

MCSD Windows Communication Foundation (WCF) 3