Message exchange patterns in Windows Communication Foundation (WCF) include request-reply operations, where the client issues a request and blocks until it receives a response, and one-way operations, where the client does not wait for or care about the response. Request-reply is the default and is supported by all WCF bindings except NetPeerTcpBinding and NetMsmqBinding. One-way operations may queue messages if the queue exceeds capacity, blocking the client. All WCF bindings support one-way operations through configuration.