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Networking Technologies Presentation. Presented by David Fisher June 4, 1999 West Lafayette, IN. 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). What devices can I find on a network?. - PowerPoint PPT Presentation
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Networking Technologies Presentation
Presented by David Fisher
June 4, 1999
West Lafayette, IN
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).
What devices can I find on a network?• Printers
• Modems
• Fax machines
• Cameras
• Robots
• Computers
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.
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
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
Are there other differences?
• Server-based networks - client/server– Monolithic vs. Distributed
• Provides centralized administration
• Push/Pull installations
• Software metering
• Standardized security
• Peer-Peer Networks– Loosely organized group of computers
(workgroups).• No centralized administration
• No big server costs
Are there still other differences?
• Topologies - Star, Bus, Ring
• Wires/Lack of Wires
• Protocols (IP, IPX, NetBEUI)
Topologies - Star
Advantages
Less expensive
More reliable
Disadvantages
Takes more cable
Thanks to:
James Griffoen
http://www.dcs.uky.edu/~griff/
Thanks to:
James Griffoen
http://www.dcs.uky.edu/~griff/
Topologies - Ring
Advantages
Equal access - token passing
Disadvantages
One break takes everyone down
Thanks to:
James Griffoen
http://www.dcs.uky.edu/~griff/ :
Thanks to:
James Griffoen
http://www.dcs.uky.edu/~griff/ :
Topologies - Bus
Advantage Relatively inexpensive
Disadvantage One break takes everyone down
David Fisher:
Thanks to:
James Griffoen
http://www.dcs.uky.edu/~griff/
David Fisher:
Thanks to:
James Griffoen
http://www.dcs.uky.edu/~griff/
Media Types
• UTP - Unshielded twisted pair
• STP - Shielded twisted pair
• Coaxial (thick and thin)
• Fiber Optic
• Infrared
• Radio
• Microwave
Common Protocols
• TCP/IP - Unique IP needed
• SLIP/PPP - dial up access
• IPX/SPX - Novell
• NetBEUI - Microsoft
• AppleTalk
• DLC (Data Link Control) - HP Jetdirect
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)
Is there a better way to look at this?
• Yes ….
It’s called the Open Systems Interconnect (OSI) Model.
OSI Model
Thanks to:
www.osilab.ch
Thanks to:
www.osilab.ch
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
• Session - Maintains session between nodes
• Presentation - Translates data
• Application - Controls access by apps
Network Device?
• Application - Boogie• Presentation unknown• Session - unknown• Transport - proprietary• Network - proprietary• DataLink - unknown• Physical - IR
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
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?
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 …...
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).