Transcript Networking Technologies Presentation

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?
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Printers
Modems
Fax machines
Cameras
Robots
Computers
Terms
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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?
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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
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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)
Thanks to:
James Griffoen
http://www.dcs.uky.ed
u/~griff/
Topologies - Star
Advantages
Disadvantages
Less expensive
Takes more
cable
More reliable
Thanks to:
James Griffoen
http://www.dcs.uky.ed
u/~griff/ :
Topologies - Ring
Advantages
Disadvantages
Equal access token passing
One break
takes everyone
down
David Fisher:
Thanks to:
James Griffoen
http://www.dcs.uky.ed
u/~griff/
Topologies - Bus
Advantage
Relatively inexpensive
Disadvantage
One break takes everyone down
Media Types
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UTP - Unshielded twisted pair
STP - Shielded twisted pair
Coaxial (thick and thin)
Fiber Optic
Infrared
Radio
Microwave
Common Protocols
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TCP/IP - Unique IP needed
SLIP/PPP - dial up access
IPX/SPX - Novell
NetBEUI - Microsoft
AppleTalk
DLC (Data Link Control) - HP Jetdirect
Connectivity Devices
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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.
Thanks to:
www.osilab.ch
OSI Model
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?
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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).