2. Networking Technologies Presentation Presented by David Fisher June 4, 1999 West Lafayette, IN

3. What is a network? A group of computers and other devices that communicate together and share resources (i.e. file storage space and printing services).

4. What devices can I find on a network? Printers Modems Fax machines Cameras Robots Computers

5. Terms Mbps - MegaBits per second Nic - Network interface card IP - Internet Protocol TCP/IP - Transmission Control Protocol Internet Protocol Protocol - set of rules for communication for network devices.

6. What kind of Networks exist? WAN - Wide Area Network. Exists between buildings, states, countries. LAN - Local Area Network. Normally thought of as within a building. MAN - Metropolitan Area Networks

7. Are all networks the same? Ethernet - Most popular. 10 Mbps. Fast Ethernet - 100 Mbps AppleTalk - 2 Mbps. Not routed at Purdue. Token Ring - 4 - 16 Mbps. Passes a token. ARCnet - 2.5 Mbps (20 - 100 for ARCnet Plus). It too passes token. FDDI - Fiber Distributed Data Interface - Backbone Stuff

8. Are there other differences? Server-based networks - client/server –Monolithic vs. Distributed Provides centralized administration Push/Pull installations Software metering Standardized security

9. Peer-Peer Networks –Loosely organized group of computers (workgroups). No centralized administration No big server costs

10. Are there still other differences? Topologies - Star, Bus, Ring Wires/Lack of Wires Protocols (IP, IPX, NetBEUI)

11. Topologies - Star Advantages Less expensive More reliable Disadvantages Takes more cable Thanks to: James Griffoen http://www.dcs.uky.ed u/~griff/ Thanks to: James Griffoen http://www.dcs.uky.ed u/~griff/

12. Topologies - Ring Advantages Equal access - token passing Disadvantages One break takes everyone down Thanks to: James Griffoen http://www.dcs.uky.ed u/~griff/ : Thanks to: James Griffoen http://www.dcs.uky.ed u/~griff/ :

13. Topologies - Bus Advantage Relatively inexpensive Disadvantage One break takes everyone down David Fisher: Thanks to: James Griffoen http://www.dcs.uky.ed u/~griff/ David Fisher: Thanks to: James Griffoen http://www.dcs.uky.ed u/~griff/

14. Media Types UTP - Unshielded twisted pair STP - Shielded twisted pair Coaxial (thick and thin) Fiber Optic Infrared Radio Microwave

15. Common Protocols TCP/IP - Unique IP needed SLIP/PPP - dial up access IPX/SPX - Novell NetBEUI - Microsoft AppleTalk DLC (Data Link Control) - HP Jetdirect

16. Connectivity Devices Repeater - connect network segments Hub - connects nodes (star) Switch - smart hub Bridge - filters/moves data between segments (MAC address) Router - filters/moves data between segments (logical address)

17. Is there a better way to look at this? Yes …. It’s called the Open Systems Interconnect (OSI) Model.

18. OSI Model Thanks to: www.osilab.ch Thanks to: www.osilab.ch

19. OSI Model (further) Physical - cables or other media Data Link - data broken into frames, linked to MAC address Network - Adds extra headers to frame, translates between MAC and network address Transport - Assembles packets, checks for errors

20. Session - Maintains session between nodes Presentation - Translates data Application - Controls access by apps

21. Network Device? Application - Boogie Presentation unknown Session - unknown Transport - proprietary Network - proprietary DataLink - unknown Physical - IR

22. Evaluating the Furbish Network Advantages –Runs on AA batteries –IR connection –Limited self-correcting behavior Disadvantages –Limited battery life –Proprietary interface –Irritating interface –Can’t feed after midnight

23. Interactive Session 1 Look at the configuration of your own machine. –What protocols are you running? –What clients are you running? –What kind of network interface card do you have? –What’s your IP address?

24. Interactive Session 2 Exactly how hard is it to install nics? Wanna try to install memory also … it’s not exactly networking, but two hours is a lot to fill and the case is already open …...

25. How does networking lend itself to Restaurants, Hotels, etc? Shared Databases –Database can be shared and updated with a number of people. OS or NOS provide security and reliability. –Web interfaces will revolutionize e-commerce. (BIG plug … data-mining is the future).