Transcript Extended Learning Module B

Intro to MIS – MGS351
The World Wide Web
and the Internet
Extended Learning Module B
Chapter Overview
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What is the Internet?
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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?
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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
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Roughly 39% of the world population
Internet Statistics - Hosts
Brief History of the Internet
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1969 - Network of four University computers
(ARPANET)
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1984 - Domain Name System introduced
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1986 - NSFnet connects to ARPANET
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1988 - Internet WORM affects 6,000 hosts
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1991 - Gopher and WWW released
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1993 - Mosaic is released
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Various organizations help define standards
Internet Services
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World Wide Web
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E-mail
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FTP (Archie)
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Telnet
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Chat Rooms (IRC)
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Usenet
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Gopher (Veronica and Jughead)
How does the Internet work?
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Clients
Web Servers (www.netcraft.com)
Packets
Routers
Packet Switching (TCP / IP)
Backbone
Network Access Point (NAP)
Internet Addresses
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IP (Internet protocol) address
128.205.2.235 (IPv4)
– 2002:80CD:2EB:0:0:0:0:0 (IPv6)
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Domain name
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mgt.buffalo.edu
Domain Name System (DNS)
Domain name servers
nslookup <hostname> in Windows
host <hostname> in UNIX
World Wide Web
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CERN – Where the Web was born
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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 Page
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Uniform Resource Locator (URL)
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Hypertext transfer protocol (http://)
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Hypertext markup language (HTML)
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Hyperlinks
Uniform Resource Locator
Web Page Do’s and Don’ts
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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 Internet
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CERT - www.cert.org
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1988 1 advisory and 6 incidents
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2003 28 advisories, 137,529 incidents and
3,784 vulnerabilities
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Hackers, Phishing, Denial of Service,
Worms, Viruses, Social Engineering,
Fraud, Identity Theft
Security Solutions
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Authentication / Authorization
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Firewalls
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Intrusion Detection Systems
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Data Encryption
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Secure Sockets Layer (SSL)
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Security Awareness Training & Education
Intranets (B2E)
“Private corporate network that
uses Internet technology and is
designed to meet the needs of
employees”
Extranets (B2B)
“Private corporate network
designed to meet the needs of
external parties such as
suppliers, customers, and
stockholders”
The Internet and Business
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24 / 7 access
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Global presence
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Lower marketing costs
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Two-way communications
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Lower product display and storage costs
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Lower salesperson costs
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Electronic commerce opportunities
Future Directions
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 Electronic commerce
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 Bandwidth
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 Social media applications
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Internet of Things (IoT)
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IPv6 - 340 undecillion versus 4.3 billion
340,000,000,000,000,000,000,000,000,000,000,000,000
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Ubiquitous Access (wireless/mobile)