TCP/IP Five Layer Model

Physical Layer :

Represents the physical devices that interconnect computers. (cabling, connectors)

Data Link Layer :

Responsible for defining a common way of interpreting these signals so network devices can communicate.
Ethernet

Network Layer :

Allows different networks to communicate with each other through devices known as routes.
IP = heart of internet
Internetwork : collection of networks . most famous = internet

Transport

Layer

:

Sots out which client and server programs are supposed to get the data.
TCP
UDP : User Datagram Protocol

Application Layer:

Application-specific.
HTTPS,HTTP