Open Systems Interconnection (OSI)

1. Physical Hardware
2. Fiber Optic Cables, etc
3. Data Link
4. Connect one physical node to another
5. Ethernet, Wi-Fi
6. Network
7. The Internet Protocol (IP)
8. Every computer connected to the network has its own unique IP, which identifies the computer
9. Data split in form of packets
10. The IP packet contains the IP address in the header
11. Transport
12. Take a stream of data from one computer and transfer to another
13. Segment the data in smaller pieces that can be sent over the network in the correct order
14. TCP
15. Session
16. Manage connections between two computers
17. Authentication and authorization
18. Presentation
19. Encoding, Decoding
20. E.g., decode JPG to be used by application
21. Application
22. HTTP, SMTP, FTP