1. CISCO NETWORKING ACADEMY Chabot College ELEC 99.05 Ch 2 - OSI Model

2. CISCO NETWORKING ACADEMY What is Networking? Networking Networking - the interconnection of workstations, peripherals, terminals and other devices.

3. CISCO NETWORKING ACADEMY Network Protocols In today’s networks, it is possible for different types of computers to communicate. Macs, PCs, and mainframes can all share devices, data, and information, as long as they all speak the same language, or protocol.

4. CISCO NETWORKING ACADEMY Network Protocols Protocol Protocol - a set of rules, or an agreement, that determines the format and transmission of data.

5. CISCO NETWORKING ACADEMY The Internet Protocol IP All devices on the Internet “speak” the same protocol: the Internet Protocol, or IP. TCP/IP HTTP The Internet actually uses a group, or suite, of protocols called TCP/IP which includes HTTP.

6. CISCO NETWORKING ACADEMY The Internet Protocol

7. CISCO NETWORKING ACADEMY Networking Growing Pains Emerging network technologies were built using different kinds of hardware and software. Many of the new network technologies were incompatible.

8. CISCO NETWORKING ACADEMY Toward Standardization To address the problem, the International Organization for Standardization (ISO) researched leading networks schemes: Digital’s DECnet IBM’s SNA DoD’s TCP/IP (non-proprietary)

9. CISCO NETWORKING ACADEMY The ISO’s Standard The ISO recognized there was a need to create a network model that would help vendors create networks that would work compatibly and interoperably with other networks. In 1984, the ISO released their networking model.

10. CISCO NETWORKING ACADEMY ISO’s OSI Reference Model A Layered Model: All People Seem To Need Data Processing A mnemonic:

11. CISCO NETWORKING ACADEMY ISO’s OSI Reference Model A Layered Model: A Present Session Transports Network Data Physically Another mnemonic:

12. CISCO NETWORKING ACADEMY ISO’s OSI Reference Model Open System Interconnection (OSI)

13. CISCO NETWORKING ACADEMY Layer Functions

14. CISCO NETWORKING ACADEMY 7 - Application Layer

15. CISCO NETWORKING ACADEMY 6 - Presentation Layer

16. CISCO NETWORKING ACADEMY 5 - Session Layer

17. CISCO NETWORKING ACADEMY 4 - Transport Layer

18. CISCO NETWORKING ACADEMY 3 - Network Layer

19. CISCO NETWORKING ACADEMY 2 - Data Link

20. CISCO NETWORKING ACADEMY Data Link Sublayers LLC (Logical Link Control) MAC (Media Access Control) IEEE 802 Extension to the OSI Model

21. CISCO NETWORKING ACADEMY 1 - Physical Layer

22. CISCO NETWORKING ACADEMY Media Layers

23. CISCO NETWORKING ACADEMY Host Layers

24. CISCO NETWORKING ACADEMY Devices at Layers

25. CISCO NETWORKING ACADEMY Moving Data End System

26. CISCO NETWORKING ACADEMY Peer-to-Peer Communication

27. CISCO NETWORKING ACADEMY Data Encapsulation

28. CISCO NETWORKING ACADEMY Data Encapsulation Example End System Intermediate Systems

29. CISCO NETWORKING ACADEMY TCP/IP’s Model

30. CISCO NETWORKING ACADEMY TCP/IP

31. TCP/IP v OSI Model

32. CISCO NETWORKING ACADEMY What you will study…