http://en.wikipedia.org/wiki/OSI_model

OSI 모형(Open Systems Interconnection Reference Model)은 국제표준화기구(ISO)에서 개발. 컴퓨터 네트워크 프로토콜 디자인과 통신을 계층으로 나누어 설명

1. Layer 1: physical layer
   • USB, Bluetooth,...
2. Layer 2: data link layer
   • Ethernet,...
3. Layer 3: network layer
   • IP,...
4. Layer 4: transport layer
   • TCP, UDP,...
5. Layer 5: session layer
   • SIP,...
6. Layer 6: presentation layer
   • MIME, TLS, SSL,...
7. Layer 7: application layer
   • DNS, HTTP, SSH,...

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