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

Transport

Answer

TransportWithMessageCredential

Answer

None

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

To define service operations

Answer

To configure service throttling limits

Answer

To specify which binding a service uses

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

Request-Reply

Answer

One-Way

Answer

Streaming

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

It hosts the WCF service

Answer

It manages service throttling on the server

Answer

It configures message encoding formats

Question 5

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

Accepted Answer

WebHttpBinding

Answer

BasicHttpBinding

Answer

WSHttpBinding

Answer

NetTcpBinding

Question 6

What is the role of an IServiceBehavior implementation in WCF?

Accepted Answer

It customizes or extends the runtime behavior of the entire service

Answer

It defines the operations exposed by the service

Answer

It specifies the transport protocol for the service

Answer

It encrypts outgoing messages

Question 7

Which InstanceContextMode value causes WCF to create a new service instance for every incoming message?

Accepted Answer

PerCall

Answer

Single

Answer

PerSession

Answer

Shared