what protocol does wcf use
The transport channel is the bottom-most channel of the WCF stack. The protocols that are typically used in this channel are HTTP, TCP, MSMQ, and named pipes, but WCF allows application developers to use other transports as well, such as Simple Mail Transfer Protocol (SMTP) or File Transfer Protocol (FTP).
WCF includes a message framing protocol that is called .NET Message Framing for use with transports that do not natively support messaging. This framing protocol is used with the TCP transport to create NetTcp and with the MSMQ transport to create NetMsmq.