Types of MessageExchange Pettern behavior in WCF?

There are three types of MessageExchangePattern behavior in WCF.

1. Request\Reply :-  In this pattern, a client application send a message to a WCF service and wait for a reply.
2. One Way :- In this pattern, a client application send a message to a WCF service but WCF service does not send a reply message to the client. In this message exchange pattern, client does not wait for a reply from wcf service.
3. Duplex\CallBack :- In this pattern, both client and service can start communication and expect notification \Alert message from their counter part.