Transmission control protocol/ internet protocol TCP/IP
The reference model is used in the internet it consist of four layers as compared to
OSI
OSI Model TCP/IP Model
t
The key parallels are in the transport & network layers.
4-Aplication layer: represent data to the users, encoding& dialog control. It include
high level protocol, Terminal protocol (TELENT), Simple Mail Transfer
protocol(SMTP), File Transfer Protocol(FTP) for the early ones, at later time Doman
Name Services (DNS) are used for mapping host name into their network addresses,
Hyper Text Transfer Protocol HTTP for fetching pages on World Wide Web
(WWW)&different task.
3-Transport layer : supports communication between diverse devise across diverse
network, it permit peer entities on source & destination hosts to carry on a
conversation.
There two protocol
7-Application
6-Presentation
5-Session
Application
4-Transport
Transport
3-Network
Internet
2-Datalink
1-Physical
Network
Access