TCP/IP basics

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TCP/IP basics

TCP/IP is not single protocol, but it is a protocol suit. This networking model has four layers. We can roughly compare this model with OSI model of networking.

Application

Presentation

Session

Transport

Network

Data Link

Physical

Layers of OSI model

Application

Transport

Network

Link

Layers of TCP/IP model

The Application layer of TCP/IP model is equivalent to top three layers of OSI model. Whereas TCP/IP link layer is equivalent to the bottom two layers of OSI model. There are many TCP/IP protocols. Some of them are in regular use like FTP, TCP, IP, SMTP, HTTP, POP3, and NFS etc. Few of these are described hereunder: