1. Introduction to Technology Infrastructure Chapter 1

2. Announcements and Outline Syllabus Questions White Hat Agreement Class Outline 1.Introduction to Networks 1.1Network Types/Technologies 1.2Layering and Packetization 2

3. 1.1 Network Types/Technologies How we view a network geographically Representing Networks in diagrams 3

4. 1.1 Network Types/Technologies 4

5. Local Area Networks (LAN) Wireless Local Area Networks (WLAN) Backbone MAN WAN 5

6. 1.2 Network Layers Most Commonly Used Models: OSI (Open Systems Interconnection Reference Model) Network Model Protocols & Protocol Data Unit (PDU) 6

7. 1.2 Network Layers (Network Model) 7

8. 1.2 Network Layers (CCNA TCP/IP Model) 8

9. 1.2 Network Layers – Packetization Packetization is  breaking down user data into small segments  packaging these segments appropriately so that they can be delivered and reassembled across the network 9 *From Agarwal – Business Data Communications

10. 1.2 Network Layers – 5 Important Data Comm. Tasks 10

11. 1.2 Network Layers APPLICATION LAYER Software used by the users Common Examples: Protocols: PDU: 11

12. 1.2 Network Layers TRANSPORT LAYER End to end management Responsibilities : (1) Link Applications Layer (2)Segmenting and Tracking (3)Session Management 12

13. 1.2 Network Layers TRANSPORT LAYER (cont.) Protocols: PDU: 13

14. 1.2 Network Layers NETWORK LAYER Decides where the messages should go Functions: (1)Addressing (2)Routing Protocol: PDU: 14

15. 1.2 Network Layers DATA LINK LAYER Moves messages from one computer to the next Functions: (1)Controls Hardware (2)Formats Messages (3)Error Checking Protocol: PDU: 15

16. 1.2 Network Layers PHYSICAL LAYER Hardware that transmits the message Protocols: PDU: 16

17. 1.2 Network Layers - Summary Layer # Layer name Networking task Header information 5Application Specify user needsUser commands 4Transport Segmentation and reassembly of packets Sequence numbers 3Network Identifying and locating destinationAddress 2Data-link Error controlError check 1Physical SignalingNone 17

18. Network Model technologies by layer 18

19. 1.2 Network Layers - Summary 19

20. 1.2 Network Layers – Msg Transmission 20

21. 1.2 Network Layers Standards IEEE (Institute of Electrical and Electronics Engineering) – develops US standards Formal Standardization Process Internet technology standards are publicly available as Requests For Comment (RFCs)  http://www.ietf.org/rfc.html http://www.ietf.org/rfc.html Highly recommended standards  Email: http://www.ietf.org/rfc/rfc0821.txthttp://www.ietf.org/rfc/rfc0821.txt  HTTP: http://www.ietf.org/rfc/rfc2616.txthttp://www.ietf.org/rfc/rfc2616.txt  TCP: http://www.ietf.org/rfc/rfc0793.txthttp://www.ietf.org/rfc/rfc0793.txt  IP: http://www.ietf.org/rfc/rfc0791.txthttp://www.ietf.org/rfc/rfc0791.txt  TCP/ IP tutorial: http://www.ietf.org/rfc/rfc1180.txthttp://www.ietf.org/rfc/rfc1180.txt  Domain names: http://www.ietf.org/rfc/rfc1034.txthttp://www.ietf.org/rfc/rfc1034.txt 21

22. Pros and Cons of using Layers CONS: 22

23. Pros and Cons of using Layers PROS: 23

24. Recap 1Network Types 1.1 Network Types LAN WLAN Backbone WAN 1.2 Network Layers Network Model Standards Pros/Cons 24

25. Thursday Chapter 2 – Application Layer Hardware Software Architecture Web Email 25