1.OSI seven standard model developed model, are: the application layer, layer, session layer, transport layer, network layer, data link layer, physical layer representation.
2.TCP / IP protocol is divided into four levels, I think the agreement focuses on the application layer and the transport layer on it. Take for example sending mail, send mail to A B, A concerned about what is written in what format to B (application layer content), it is sent by registered mail or send regular mail (transport layer content), but A is not going to pay attention mail delivery process using that route, how the postman delivers letters to (interconnection network layer, network interface layer) hands B.
3. I looked up the information, this is the same thing, soap will be serialized XML information, and then re-packaged the way the http protocol for transmission, or delivered over tcp or udp. To be a metaphor I like to understand. tcp and udp are roads, for the time being put roads in general considered to be tcp, udp highway, soap and http are on the car, then the soap and can be run on http tcp and udp. Said soap can be transmitted through http, is the actual car that is soap, http car is loaded trucks, the information at http mounted soap inside, then transport, of course, take the road or tcp or udp.
Said soap can be transmitted through http protocol, this statement is not accurate, more accurate first argument is: soap packaging information via http protocol tcp or udp transmission.