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).