11 THE INTERNET & E-COMMERCE IS 340 BY CHANDRA S. AMARAVADI.

11

THE INTERNET & E-COMMERCE

IS 340

BY

CHANDRA S. AMARAVADI

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BackgroundArchitectureProtocols TCP/IPHTTP and HTMLBrowser & web searchSecurityElectronic commerce

PRESENTATION OVERVIEWPRESENTATION OVERVIEW

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Started as a research networkReleased into public domain in 1993Web technology (web pages) in 1992Publicly owned (Lucent, Pac Bell etc.)Costs borne by ISPs & industry200 million users on the web world wide

BACKGROUNDBACKGROUND

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INTERNET ARCHITECTUREINTERNET ARCHITECTURE

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BASIC ARCH. CONCEPTS

Packetizing IP addresses Bridges and routers Root servers Hi-speed back bone

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PACKETIZING DATA

Document

Packet 1 Packet 2

….

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IP ADDRESSING

NODE (143.43.78.84)

NODE NODE (153.54.56.82)

NODE

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Network NetworkBridge

Network

Network

Router

Network

Gateway

BRIDGES AND ROUTERS

143.43.78.84 143.43.78.84

143.43.78.84

153.54.56.82

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ROOT SERVER (DNS)

ROOT SERVER

ROOT SERVER NODE

NODE

A root/DNS server provides address information to gateways

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Regionalnetwork

NAP

BASIC ARCH. CONCEPTS..BASIC ARCH. CONCEPTS..

HIGH SPEED BACKBONEHIGH SPEED BACKBONE

Regionalhub

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50,000 world wide29,000 in USA16 million hosts

WWW - A network of webservers (content in HTML) -- 3.6 million web sites

The Internet is a network of networks

ARCHITECTUREARCHITECTURE

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Millions of hosts connected Physical connection is a bridge (hub)Each “host” has a unique IP addressHosts can be PCs, Web servers, Mainframes

Use uniform protocols (TCP/IP) Data is sent as packets Addressed by hosts Routed by routers


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Bridges, routers, gateways maintain directories, move data

Internet


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WEB SITESBrowsers (terminals that access the web site --

called clients) A web server (a special computer or mini-

computer that will host the site)Server software (to run TCP/IP protocols)Web content i.e. the web pageFirewall (mechanisms (HW/SW) for security)


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SERVER ARCHITECTURE (FYI)

INTERNET SERVICE PROVIDER

INTERNET INTERFACE/FIREWALL

SERVER BOX

NETWORK OPERATING SYSTEM

FTP DNSCLIENTACCESS

AUTHORINGTOOLS

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ISP ARCHITECTURE

VBNS -- Very High Speed Backbone

PacBell Ameritech Lucent Lucent

Backbone

NetworkAccess Pts.

InternetAccess Sprint MCI Verizon AOL UUnet PSI

LocalAccess

EndUsers

LocalProvider

LocalProvider

LocalProvider

LocalProvider

LocalProvider

Home Users Small Bus. Large Bus. Govt.

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INTERNET PROTOCOLSINTERNET PROTOCOLS

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+ FTP, Telnet, HTTP+ TCP

+ IP+ FDDI, Ethernet, Token ring,

CSMA/CD ,X.25, ISDN

Host level

Application

Gateway levelNetwork level

A HIERARCHY OF PROTOCOLSA HIERARCHY OF PROTOCOLS

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HOSTBROWSER HOST WEB SERVER

(HTTP) (TCP/IP) (TCP/IP)(HTTP)

(CSMA/CD)

(FDDI) (Ethernet)


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Protocol for reliable data transferA collection of 100 protocolsHardware independentData is packetized Rules for

formatting messagesestablishing sessionsgoverning transmissions Host

Application

Gateway

Network access

TCP/IP PROTOCOLTCP/IP PROTOCOL

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Document

HTTP

Port#, seq#, parity,...message

Packet 1

TCP

Packet 2

….

Source Port Destination PortSequence #Acknowledgement #ParityOptionsData

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Unique address. Assigned by IETF/ICANN.In the form of a domain name (ibm.com).Email addresses based on this ([email protected])Translated to “dotted quad”:203.48.54.28.

What are some common domain extensions?

INTERNET PROTOCOL (IP)INTERNET PROTOCOL (IP)A protocol for assigning & resolving IP addresses

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HOSTBROWSER HOST WEB SERVER

(HTTP) (TCP/IP) (TCP/IP)(HTTP)

(CSMA/CD)

(FDDI) (Ethernet)


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A protocol for formatting and transferring multi-media objects, text, etc.

“Stateless protocol” Data is sent as plain character text Rules specify both request and response format

HTTP – Hypertext Transport ProtocolHTTP – Hypertext Transport Protocol

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REQUESTGET Myfile.htm http/1.0ACCEPT image, bitmap, JPGUSER AGENT Netscape 9.0CONNECTION Keep alive

HTTP – Hypertext Transport Protocol (FYI)HTTP – Hypertext Transport Protocol (FYI)

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RESPONSEHttp/2.0: OKServer: NetscapeLast modified: 3/9/08Content length: 10 KB

HTTP – Hypertext Transport Protocol (FYI)HTTP – Hypertext Transport Protocol (FYI)

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HYPERTEXT MARKUP LANGUAGEHYPERTEXT MARKUP LANGUAGE

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A tagging language based on SGML Text appearance and structure is governed by

embedded commands or tags. Example bold, paragraph etc. There’s a start tag and end tag (e.g. <B>Text to be

bolded </B>)

HTML – HYPERTEXT MARKUP LANGUAGE…HTML – HYPERTEXT MARKUP LANGUAGE…

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THREE MAJOR TYPES OF TAGS

Structuring tags -- e.g. heading, body, frame etc. Formatting tags -- e.g. bold, italic, font etc.

Hyperlink tags -- e.g. image, sound etc.

HTML – HYPERTEXT MARKUP LANGUAGE


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<HTML>

.

.

.

.

</HTML>

To begin & end HTML

STRUCTURING TAGSSTRUCTURING TAGS

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Heading

<Head>

<title> Main page of spectrum </title>

Window title

</Head>

<H1> …………………………… </H1>

<H2> ………………………….. </H2>

Web page heading

STRUCTURINGSTRUCTURING

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Body<Body>

.

.

</Body>

Main part of web page

<Body Bgcolor= “color” text=“color” link=“color” vlink=“color” alink= “color”>

STRUCTURINGSTRUCTURING

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Font

<font size= “number” color= “color”face= “font name”>

Size = “+1” “+2”

FORMATTINGFORMATTING

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Paragraph <P> ……………. </P>

Alignment <P align = “Left”> _____________________________________________</P>Aligns left

Bold <B> …………. </B>Italic <I>…………... </I>Line Breaks <BR>

FORMATTINGFORMATTING

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<a href = “URL of page” > text or image for user to click on </a>

e.g.<a href = http://www.cnn.com> CNN </a> <a href = “http://www.faculty.wiu.edu/C-Amaravadi/”> Course web sites </a>

URL: Uniform Resource Locator, address of a resourceon the internet; resource could be??

HYPERLINKSHYPERLINKS

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Image <img src = “URL of image” height = “number” width = “number”>

height

width

For text wrap add ALIGN = “Left”

IMAGES & HYPERLINKSIMAGES & HYPERLINKS

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<HTML> <HEAD><TITLE> Main Menu </TITLE></HEAD>

<BODY BGCOLOR = “#FFFF6B” TEXT = “#A50063>

<P> <IMG SRC=“logo.jpg” height = 100 width = 600></P></HTML>

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<B> ABOUT US </B> <BR>Founded in 2006, our corporate mission.......

<SPACER TYPE = HORIZONTAL SIZE = 20> Varyti Broadcasts -- TV Program Division....................

</BODY></HTML>



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BROWERS & EXTENSIONSBROWERS & EXTENSIONS

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Connection & data transferrequest connection by sending HTTP requestRespond to HTTPreceive response and displays information

Display web pages Create web pages

Software to view web pages e.g. Internet Explorer, Firefox.

Functions:

BROWSERSBROWSERS

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Plug-ins Programs that work with

browser, e.g. audio & video players.

Java programming language to build web applications.

JSP (Java Server Pages) used to create dynamic html pages.

Servlets compiled JSP to respond to http requests.

WEB TECHNOLOGIESWEB TECHNOLOGIES

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Enable web search (look for keywords) Store keywords & web locations Use indexing

GoogleYahooAnswers.com

WEB SEARCH TOOLS/ENGINESWEB SEARCH TOOLS/ENGINES

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INTERNET SECURITYINTERNET SECURITY

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Packet filtering protected host (bastion host) dedicated routers/switches monitoring and logging of users

Firewall -- a system designed to protect a web-site

from unauthorized access

Principles are:

INTERNET SECURITYINTERNET SECURITY

Internet

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E-COMMERCEE-COMMERCE

WHAT IS E-COMMERCE?

What is M-commerce?

• Business conducted on the web• Buyers and sellers interact electronically

BUYER SELLEROnlineTransactions

Products/Services

Payments

Cust to business (B2C)◦ ordering products, books, sw, music, consumer products◦ services, banking & finance, stock trades

Business to Business (B2B)◦ supply of raw materials

Intra-Org◦ inventory ordering & charge out, etc.◦ helpdesk, etc.

Retail e.g. books, toys etc. Premium content e.g. CNN & financial

companies Auctions e.g. cars, steel, power Gateways, search engines

DISCUSSION

What are the pros & cons of e-commerce? (to customersand to businesses)

E-COMMERCE MODEL

Product Search

Comparison shopping

Placement of order

Payment information

Payment authorization

Receive merchandise

Service and support

Backend layer

Middle-tier layer

Web Server layer

Incoming Internet request

Web Server

E Commerce Sever

MainframeERP System

Database

E-COMMERCE ARCHITECTURE

ECOMMERCE ISSUES

Volatility of information -- updates Ensuring adequate security Ethical usage of customer information Advertising Legal issues – sales, contracts etc.

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That’s All Folks!That’s All Folks!

11 THE INTERNET & E-COMMERCE IS 340 BY CHANDRA S. AMARAVADI.

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Transcript of 11 THE INTERNET & E-COMMERCE IS 340 BY CHANDRA S. AMARAVADI.