Intro to MIS – MGS351The World Wide Web

and the Internet

Extended Learning Module B

Chapter Overview

What is the Internet?– Overview of various Internet Services

How does the Internet work? The World Wide Web Security and the Internet Intranets and Extranets Future directions of the Internet

“The Internet is one of the rare, if not unique, instances where ‘hype’ is accompanied by understatement, not overstatement…I don’t think we know what has hit us.”

Nicholas Negroponte, Director, MIT Media Lab

What is the Internet?

Two or more networks joined together (i) Worldwide group of connected networks

that allow public access to information and services (I)

No central governing body Estimated 2.8 billion users

Roughly 39% of the world population

Internet Statistics - Hosts

Brief History of the Internet

1969 - Network of four University computers (ARPANET)

1984 - Domain Name System introduced 1986 - NSFnet connects to ARPANET 1988 - Internet WORM affects 6,000 hosts 1991 - Gopher and WWW released 1993 - Mosaic is released Various organizations help define standards

Internet Services

World Wide Web E-mail FTP (Archie) Telnet Chat Rooms (IRC) Usenet Gopher (Veronica and Jughead)

How does the Internet work?

Clients Web Servers (www.netcraft.com) Packets Routers Packet Switching (TCP / IP) Backbone Network Access Point (NAP)

Internet Addresses

IP (Internet protocol) address– 128.205.2.235 (IPv4)– 2002:80CD:2EB:0:0:0:0:0 (IPv6)

Domain name– mgt.buffalo.edu

Domain Name System (DNS) Domain name servers

nslookup <hostname> in Windowshost <hostname> in UNIX

World Wide WebWorld Wide WebWorld Wide WebWorld Wide Web

CERN – Where the Web was born– home.web.cern.ch/topics/birth-web

– Tim Berners-Lee – Hyperlinked documents– Defined URL’s, HTML, and HTTP– Designed for collaborative research

Anatomy of a Web PageAnatomy of a Web PageAnatomy of a Web PageAnatomy of a Web Page

Uniform Resource Locator (URL)

Hypertext transfer protocol (http://)

Hypertext markup language (HTML)

Hyperlinks

Uniform Resource LocatorUniform Resource LocatorUniform Resource LocatorUniform Resource Locator

Web Page Do’s and Don’tsWeb Page Do’s and Don’tsWeb Page Do’s and Don’tsWeb Page Do’s and Don’ts

Keep your pages small Limit graphics on pages to keep them

“light” Reuse graphics and avoid animations Balance images and text Test...test...test… Know your customer

Security on the InternetSecurity on the InternetSecurity on the InternetSecurity on the Internet

CERT - www.cert.org

– 1988 1 advisory and 6 incidents

– 2003 28 advisories, 137,529 incidents and

3,784 vulnerabilities

Hackers, Phishing, Denial of Service,

Worms, Viruses, Social Engineering,

Fraud, Identity Theft

Security SolutionsSecurity SolutionsSecurity SolutionsSecurity Solutions

Authentication / Authorization

Firewalls

Intrusion Detection Systems

Data Encryption

Secure Sockets Layer (SSL)

Security Awareness Training & Education

Intranets (B2E)Intranets (B2E)Intranets (B2E)Intranets (B2E)

“Private corporate network that uses Internet technology and is designed to meet the needs of employees”

Extranets (B2B)Extranets (B2B)Extranets (B2B)Extranets (B2B)

“Private corporate network designed to meet the needs of external parties such as suppliers, customers, and stockholders”

The Internet and BusinessThe Internet and BusinessThe Internet and BusinessThe Internet and Business

24 / 7 access Global presence Lower marketing costs Two-way communications Lower product display and storage costs Lower salesperson costs Electronic commerce opportunities

Future DirectionsFuture DirectionsFuture DirectionsFuture Directions

Electronic commerce

Bandwidth

Social media applications

Internet of Things (IoT)

IPv6 - 340 undecillion versus 4.3 billion

340,000,000,000,000,000,000,000,000,000,000,000,000

Ubiquitous Access (wireless/mobile)