Introduction to Computer Network

Communication Model

• source

• trasnmitter

• trasmission system(Network) LAN, MAN, WAN, …

• receiver

• destination

Source -> Trasnmitter -> Transmission System -> Receiver -> Destination

Data Communication Model

• information

• data

• signal

TCP/IP

Application Layer

• Support Application

• http, SMTP

Transport Layer

• 신뢰성을 책임짐

• TCP

Internet Layer

• IP

Network Layer

• Destination Address Provision

Physical Layer

• 101010 신호를 보냄

Connection Oriented VS Connectionless

	Connection Oriented	Connectionless
complexity	complicated	simple
cost	expensive	cheap
state	multi-state	1-state
memory	sequence control possible	memory-less
reliability	reliable	un-reliable
e.g	TCP	UDP, HTTP