OSI 7 계층 모델

#network #osi-7layer

참고 자료

• Practical Networking
  • 『OSI Model: A Practical Perspective - Networking Fundamentals - Lesson 2a』
  • 『OSI Model: A Practical Perspective - Part 2 - Networking Fundamentals - Lesson 2a』

1. Physical Layer

• Computer data exists in form of Bits (1 and 0)
• Somthing has to transport thos bits between hosts
• L1 Technologies: Cables, Wifi, Repeaters, Hub

2. Data Link Layer

• Hop-to-Hop communication
• use Mac Address
• L2 Technologies : ARP, (L2) Switch

3. Network Layer

• End-to-End communication
• use IP Address
• L3 Temnologies - IP (Internet Protocol), Router

4. Transport Layer

• Service-to-Service communication (Process to Process)
• use port number
  • L4 Technologies - TCP, UDP

5.6.7. - Session, Presentation, Application

• Distinction between these layers is somewhat vague

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Last update: May 10, 2023
Created: February 9, 2023