5583_web technologies [compatibility mode]

8/7/2019 5583_Web Technologies [Compatibility Mode]

1/15

Web Technologies

Umesh H Rao

Copyright 2009 XIMB Bhubaneswar 1

Information Systems

Reference

References used for preparing this Lecture Notes

E-commerce An Indian Perspective P.T. JosephManagement Information System By LaudonWilliam Stallings Computer Data Networkshttp://www.cisco.com and Cisco CCIE booksMcAfee.comNetworkworld.comLucent.com



2/15

What is WWW

The World Wide Web (" W W W " or" "

medium which users can read and writevia computers connected to the Internet( http://en.wikipedia.org/wiki/History_of_the_World_Wide_Web )

Web Static Document RepositoryE-mail, Web Downloads(FTP) audio, videos,etc


Evaluation of Web

Publish information ProcessTransactions Digital Economy

Web SitesPages

TransactionsRevenues

Business TransformationBusiness Processes


ro s


3/15

Business Drivers of WWW

Enable transactionsow n erac v y e ween rowser an

serverFacilitate personalizationSupport multiple browsing devicesBetter organize and retrieve Web contentSupport Business-to-Business applications


Todays Internet Business Solutions

Intranets

Extranets

E-commerce



4/15

What Is an Intranet?

An internal network based on Internet and WWWtechnology that delivers immediate, up-to-dateinformation and services to networked employees

Platform independentQuick to implementGlobal reach


Typical Intranet Applications

Employee self-service

Technical supportVideoconferencing



5/15

What Is an Extranet?

An extension of the companyne wor , ac a ng securecollaborative connections with:

Key customersSuppliersPartners


Typical Extranet Applications

Supply-chain management us omer commun ca ons

Distributor promotionsOnline continuing education/trainingCustomer serviceOrder status inquiryInventory inquiry


Account status inquiryWarranty registrationClaimsOnline discussion forums


6/15

Example: Supply Chain Management

ManufacturersDistributors/Wholesalers ConsumersSuppliers Retailers


From my suppliers suppliers to mycustomers customers

How the Web/Internet Has Changed the Faceof Marketing

Educating the Consumer us omer n a e n erac on

Increased Consumer Participation in theProduct OfferingCross-Channel Consciousness

Reference: Lane J. Anderson, Founder of Prospecta, Inc..



7/15

How Web/Internet Changed our lives

Google- ay

Instant MessengerBloggerIndian Railways IRCTCIndi o Airlines


Broadcast Video

Networked Multimedia Applications

Videoconferencing

Content on Demand


8/15

Distance learnin surveillance

Broadcast Video

telemedicine, TV broadcastHigh-quality video,medium-to-high bandwidth, lowdelay, unidirectionalVendors: Optivision, Nuko, K-Net,

Distance Learning

Jamshedpur

XIMB-Bhubaneswar

Cisco

Kolkata

One-to-many Live or stored feed Desktop- or room-based delivery


9/15

Surveillance

Many-to-one Security surveillance Highway traffic monitoring

Videoconferencing Configuration

WAN

Two-way Few-to-few Desktop- or room-based LAN (H.323) and ISDN (H.320)


10/15

Video, voice, and data collaboration

Videoconferencing

Low-to-medium bandwidth Bidirectional Desktop-based conferencing Room-based conferencing

Content-on-Demand

VideoServer

Low- to medium-bandwidthapplications

Recorded training Information kiosks

Internal and external communication Entertainment Vendors: Microsoft NetShow,

RealNetworks RealVideo, VivoActive


11/15

Webcasting/Webinar

Special type of one-directional videoconferencingContent is sent from the server to users

ProcessContent created by developerDownloaded as needed by the userPlayed by a plug-in to a Web browser

No standards for webcasting yetDefacto standards: products by RealNetworks, Microsoft


Multimedia Services Standards

Proprietary early systems

H.320Designed for room-to-room videoconferencing over high-speed phone lines

H.323/SIPFamily of standards designed for desktopvideoconferencing and just simple audio conferencing over


MPEG-2/MPEG-4Designed for faster connections such as LAN or privatelyowned WANs


12/15

Videoconferencing Provides real time transmission of video andaudio signals among two or more locations

locationsSaving money and time by not having to move peoplearound (conference calling does the same thing)

Typically involves 2 special purpose rooms withcameras and displaysDesktop videoconferencing

2 - 23

microphones together over the Internet

No need for special roomsExample: Net Meeting sw on clients communicatingthrough a videoconference server

Management ChallengesConcern about traffic slowing down Internet

New fiber based circuits deployment overbuilt

Many new broadband technologies for high speed Internetaccess

Simple to move large amount of data into most homes andbusiness richer multimedia apps

Which access technology to dominate?Challenge: Figure out which one


Content filteringPornography, IM, etc


13/15

Google

Copyright 2003 Google Inc. Used withpermission.

25

How Google Search Engine WorksGoogle uses automated programs called spiders

, .like other search engines, Google has a largeindex of keywords and where those words canbe found. What sets Google apart is how it rankssearch results, which in turn determines theorder Google displays results on its search engineresults page (SERP). Google uses a trademarkedalgorithm called PageRank , which assigns eachWeb page a relevancy score.



14/15

How Google Search Engine Works(Contnd)

A Web page's PageRank depends on a few factors:The fre uency and location of keywords within theWeb page : If the keyword only appears once within thebody of a page, it will receive a low score for that keyword.How long the Web page has existed : People create newWeb pages every day, and not all of them stick around forlong. Google places more value on pages with anestablished history.The number of other Web pa ges that link to the pagein question : Google looks at how many Web pages link toa particular site to determine its relevance

Reference:http://computer.howstuffworks.com/internet/basics/google.htm


How the Web WorksServer Computer

HTTP - Hypertext Transfer ProtocolMain Web communications protocol:

HTTP Response

HTTP Request

Client Computer

2 - 28

Clicking on a hyperlink ortyping a URL into a browserstarts a request-response cycle

A request-response cycle:include multiple steps since webpages often contain embeddedfiles, such as graphics, eachrequiring a separate response.


15/15

E-mail Standards

SMTP - Simple Mail Transfer ProtocolMain e-mail standard for

Originating user agent and the mail transferagentBetween mail transfer agents

Originally written to handle only text filesUsually used in two-tier client-server architectures

Post Office Protocol (POP) and Internet MailAccess Protocol (IMAP)

2 - 29

and mail transfer agent

Main difference: with IMAP, messages can be left atthe server after downloading them to the clientOther competing standards

Common Messaging Calls (CMC), X.400

END OF SESSION

THANK YOU


5583_web technologies [compatibility mode]

Documents