Transcript COSC541 Data Communication and Networks

COSC541
Data Communication
and Networks Presentation
Presented to:
Prof. Mort Anvari
Presented by:
Wei, YouRong
Chen, Ting
Introduction
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The Two Types
The History of LANs
The Ideas OF Internet
The Organizations
Two Types of LANs
• Wired LANs
• Wireless LANs
The History of LANs
• The first paper on packet switching
theory in July 1961 and the first book on
the subject in 1964.
• Packet switching networks for secure
voice in the military in 1964.
• The first public demonstration of this new
network technology to the public in Oct.
1972.
The Ideas of Internet
• ARPANET is the pioneering packet
switching network.
• In 1972, Kahn at DARPA decide to develop
a new version of Transmission Control
Protocol/Internet Protocol (TCP/IP) .
• The first written version of the resulting
approach was distributed.
• DARPA let three contracts to Stanford
(Cerf), BBN (Ray Tomlinson) and UCL
(Peter Kirstein) to implement TCP/IP.
The Ideas of Internet (Continued)
• In 1976, Kleinrock published the first book
on the ARPANET.
• Paul Mockapetris of USC/ISI invented the
Domain Name System (DNS).
• Interior Gateway Protocol (IGP) used inside
each region of the Internet, and an Exterior
Gateway Protocol (EGP) used to tie the
regions together.
• Widespread development of LANS, PCs
and workstations in the 1980s allowed the
nascent Internet to flourish.
The Ideas of Internet (Continued)
• The transition of the ARPANET host
protocol from NCP to TCP/IP as of January
1, 1983 was a "flag-day" style transition.
• TCP/IP was adopted as a defense standard
three years earlier in 1980. The transition of
ARPANET from NCP to TCP/IP permitted
it to be split into a MILNET supporting
operational requirements and an ARPANET
supporting research needs.
The Ideas of Internet (Continued)
• By 1985, Internet was already well
established and used by other communities
for daily computer communications.
• MFENet, HEPNet, CSNET, USENET,
BITNET, NSFNET were devised by
different organizations or companies.
• The backbone had made the transition from
a network built from routers out of the
research community to commercial
equipment.
Organizations
• DARPA (The Defense Advanced Research
Projects Agency).
• ICB (International Cooperation Board).
• ICCB (Internet Configuration Control
Board).
• IAB (Internet Activities Board).
• IETF (Internet Engineering Task Force).
• IESG (Internet Engineering Steering
Group).
• IRTF (Internet Research Task Force
combined with IETF).
Organizations (Continued)
• CNRI (Corporation for National Research
Initiatives).
• W3C (World Wide Web Consortium).
• Tim Berners-Lee was the inventor of the
WWW.
• LANs has a history of more than a hundred
years.
Similarities
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Same Services.
Same Networking Protocols to Use.
Same Range of Users.
Same Restrictions about the Geographic
Area.
• Same Abilities.
Dissimilarities
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Transmission Media.
Topology.
Reliability.
Flexibility and Mobility.
Configurations.
Dissimilarities
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Cost.
Installation Flexibility.
Performance.
Throughput.
Technologies.
Security.
Wireless Products
• Nokia C020/C021 Wireless LAN Card .
• Nokia A020 Wireless LAN Access Point .
• Nokia's Wireless LAN Product Line to be
Provided by TESSCO Technologies.
• Ericsson’s new wireless LAN product.
• Product of Planet Technology Corp.
• Lucent new version of wireless LAN
product line.
• Product of AIRLINX Communications,
INC.
Wired or Wireless???
• Reasons for choosing wireless LANs.
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Conventional wiring cannot be
used or can only be used with great
difficulty.
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Conventional wiring could be
used, but wireless will provide better
results.
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Repeated temporary setups and
relocations make wiring too awkward,
costly, or time-consuming.
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Greater mobility is needed for
LAN users.
Wired or Wireless???
(Continued)
• Wireless Applications:
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Doctors and nurses in hospitals are
more productive because hand-held or
notebook computers with wireless LAN
capability deliver patient information
instantly.
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Consulting or accounting audit teams or
small workgroups increase productivity
with quick network setup.
Wired or Wireless???
(Continued)
• Wireless Applications (Continued):
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Students holding class on campus
greens can access the Internet to consult the
catalog of the Library of Congress or class
notes.
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Network managers in dynamic
environments minimize the overhead
caused by moves, extensions to networks,
and other changes with wireless LANs.
Wired or Wireless???
(Continued)
• Wireless Applications (Continued):
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Training sites at corporations and
students at universities use wireless
connectivity to access information,
information exchanges, and learning.
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Trade show and branch office
workers minimize setup requirements by
installing pre-configured wireless LANs
needing no local MIS support.
Wired or Wireless???
(Continued)
• Wireless Applications (Continued):

Warehouse workers use wireless
LANs to exchange information with central
databases, thereby increasing productivity.
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Senior executives in meetings
make quicker decisions because they have
real-time information at their fingertips.
Wired or Wireless???
(Continued)
• United Parcel Service (UPS) of America
Inc.
• Three of the top U.S. airlines had taken
their competition to the airwaves with a race
to provide high-speed (11 Mbps.) wireless
LAN access to their customers in lounges
and at gates within airport terminals.
Wired or Wireless???
(Continued)
• Small businesses quickly adopt wireless
LANs. According to Shelly Tyler, a senior
analyst at Phillips InfoTech, by 2004, the
wireless LAN market in the U.S. will soar
to over $1.7 billion from $300 million in
1999, the research company projects.
Summary
• Elements to be considered when choosing
Wired LANs or Wireless LANs: the cost of
the physical media, the installation, the
existing infrastructure, the cost of
maintenance, the scalability and flexibility,
the integrity and reliability, the performance
(especially the speed), the interoperability,
the security issue, the convenience, the
obsolescence, and you should also consider
the safety and the battery for mobile
platforms, and so on. So the decision is
definitely not easy!
Summary (Continued)
• The most pressing question for the future of
the wired and wireless LANs is not only
how the technology will change, but also
how the process of change and evolution
itself will be managed. Where should LANs
go? Will the wired LANs be replaced with
wireless LANs or the wired LANs and the
wireless LANs would coexist as wireless
LANs acting as the complements of wired
LANs? Time will answer this tough
question and we are waiting for it.
Thank You!