1. CCNA 1 v3.0 Module 2 Networking Fundamentals

2. Objectives

3. Data Networks

4. What is a Network? At its simplest a network is two or more devices which are connected together using some kind of “ transmission medium ” A very simple network may be one desktop connected to a laptop

5. Network History

6. Network History continued

7. Networking Devices

8. Network Topology

9. Network Protocols

10. Local-area Networks (LANs)

11. Wide-area Networks (WANs)

12. Metropolitan-Area Network (MANs)

13. Storage-Area Networks (SANS)

14. Virtual Private Networks (VPNs)

15. The following are the three main types of VPNs: Access VPNs – Access VPNs provide remote access to a mobile worker and small office/home office (SOHO) to the headquarters of the Intranet or Extranet over a shared infrastructure. Access VPNs use analog, dialup, ISDN, digital subscriber line (DSL), mobile IP, and cable technologies to securely connect mobile users, telecommuters, and branch offices. Intranet VPNs – Intranet VPNs link regional and remote offices to the headquarters of the internal network over a shared infrastructure using dedicated connections. Intranet VPNs differ from Extranet VPNs in that they allow access only to the employees of the enterprise. Extranet VPNs – Extranet VPNs link business partners to the headquarters of the network over a shared infrastructure using dedicated connections. Extranet VPNs differ from Intranet VPNs in that they allow access to users outside the enterprise.

16. Benefits of VPNs

17. Intranet and Extranet VPN

18. Importance of Bandwidth

19. Bandwidth Pipe Analogy

20. Bandwidth Highway Analogy

21. Bandwidth Measurements

22. Bandwidth Limitations

23. Bandwidth Throughput

24. Digital Transfer Calculation

25. Digital versus Analog

26. Using Layers to Analyze Problems

27. Communication All of the different types of network face the problem of interconnection Computers are made by different manufacturers to many different standards In order for them to communicate they must adopt the same rules

28. Open Systems Interconnection ISO OSI Reference model The International Standards Organisation set out a system for Open Systems Interconnection This lays out the way that systems should communicate with each other The OSI model has 7 layers

29. Advantages Breaks network communication into smaller, simpler parts Makes learning easier. Lets people and companies specialise It allows different types of network hardware and software to communicate with each other. It prevents changes in one layer from affecting the other layers, so that they can develop more quickly.

30. OSI Layers

35. Provides connectivity and path selection between two host Provides Logical address No error correction, best effort delivery.

36. OSI Layers

37. TCP/IP Model

38. Data Encapsulation

39. OSI Reference Model

41. Summary