MCSD Windows Communication Foundation (WCF) 2

Question 1

Which attribute marks a class as serializable for transfer in WCF messages?

Accepted Answer

[DataContract]

Answer

[Serializable]

Answer

[MessageContract]

Answer

[KnownType]

Question 2

What is the purpose of the [KnownType] attribute in WCF?

Accepted Answer

Declares derived types that the serializer should recognize for polymorphic serialization

Answer

Marks an operation as a known service operation

Answer

Specifies the known bindings a service supports

Answer

Declares trusted client identities

Question 3

Which WCF binding supports WS-Security, reliable messaging, and transactions over HTTP?

Accepted Answer

WSHttpBinding

Answer

BasicHttpBinding

Answer

NetTcpBinding

Answer

WebHttpBinding

Question 4

Which WCF binding is used to create REST/JSON endpoints instead of SOAP endpoints?

Accepted Answer

WebHttpBinding

Answer

BasicHttpBinding

Answer

WSHttpBinding

Answer

NetHttpBinding

Question 5

What does setting InstanceContextMode to PerCall mean in WCF service behavior?

Accepted Answer

A new service instance is created for each incoming operation call

Answer

One service instance is shared across all clients

Answer

A new service instance is created for each client session

Answer

The instance count is determined by the binding

Question 6

Which WCF instancing mode maintains a single shared service instance for all clients and calls?

Accepted Answer

Single

Answer

PerCall

Answer

PerSession

Answer

Pooled

Question 7

What is the role of a WCF behavior configured with [ServiceBehavior] or IServiceBehavior?

Accepted Answer

Modifies or extends the runtime behavior of the service host or endpoint

Answer

Defines the message format exchanged between client and service

Answer

Specifies the transport protocol for a service endpoint

Answer

Declares which operations are accessible without authentication