MCTS Windows Communication Foundation (WCF) 2

Question 1

In WCF, which security mode encrypts and signs the message payload, protecting it regardless of transport-level security?

Accepted Answer

Message

Answer

Message security mode encrypts and signs the SOAP message itself using WS-Security, providing end-to-end protection independent of the transport channel.

Question 2

What is the purpose of the [DataContract] and [DataMember] attributes in WCF?

Accepted Answer

To mark a class and its fields/properties for serialization across service boundaries

Answer

[DataContract] marks a type as serializable by the DataContractSerializer, and [DataMember] marks the specific fields or properties to include in serialization.

Question 3

Which WCF communication pattern allows the service to call back to the client, requiring the client to implement a callback contract?

Accepted Answer

Duplex

Answer

Duplex communication allows the service to initiate calls to the client through a callback channel, which the client must implement as a separate contract.

Question 4

What does the ChannelFactory<T> class provide in WCF client-side programming?

Accepted Answer

It creates typed client channel objects without requiring a generated proxy class

Answer

ChannelFactory<T> allows you to create a channel to a service using a known contract interface, avoiding the need for a generated client proxy class.

Question 5

Which WCF binding is best suited for REST/JSON services consumed by web browsers or mobile clients?

Accepted Answer

WebHttpBinding

Answer

WebHttpBinding configures WCF for RESTful services using HTTP GET/POST with JSON or XML, without SOAP envelopes, suitable for browser and mobile clients.

(MCTS) Microsoft Certified Technology Specialist Practice Test

(MCTS) Microsoft Certified Technology Specialist Practice Test

MCTS Windows Communication Foundation (WCF) 2