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