1. The World Wide Web and the Internet Extended Learning Module B
Intro to MIS - MGS351
The World Wide Web and the Internet Extended Learning Module B

2. How does the Internet work? The World Wide Web
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

3. “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

4. Two or more networks joined together (i)
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 4 billion users
Roughly 53% of the world population

5. Internet Statistics - Hosts

6. Brief History of the Internet
Network of four University computers (ARPANET)
Domain Name System introduced
NSFnet connects to ARPANET
Internet WORM affects 6,000 hosts
Gopher and WWW released
Mosaic is released
Various organizations help define standards

7. Gopher (Veronica and Jughead)
Internet Services
World Wide Web
FTP (Archie)
Telnet
Chat Rooms (IRC)
Usenet
Gopher (Veronica and Jughead)

8. How does the Internet work?
Clients
Web Servers (
Packets
Routers
Packet Switching (TCP / IP)
Backbone
Network Access Point (NAP)

10. IP (Internet protocol) address
Internet Addresses
IP (Internet protocol) address
(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 Windows
host <hostname> in UNIX

11. CERN - Where the Web was born
World Wide Web
CERN - Where the Web was born
home.cern/topics/birth-web
Tim Berners-Lee
Hyperlinked documents
Defined URL’s, HTML, and HTTP
Designed for collaborative research

12. Uniform Resource Locator (URL) Hypertext transfer protocol (http://)
Anatomy of a Web Page
Uniform Resource Locator (URL)
Hypertext transfer protocol (
Hypertext markup language (HTML)
Hyperlinks

13. Uniform Resource Locator

14. Security on the Internet
CERT -
advisory and 6 incidents
advisories, 137,529 incidents and 3,784 vulnerabilities
Hackers, Phishing, Denial of Service, Worms, Viruses, Social Engineering, Fraud, Identity Theft

15. Authentication / Authorization Firewalls Intrusion Detection Systems
Security Solutions
Authentication / Authorization
Firewalls
Intrusion Detection Systems
Data Encryption
Secure Sockets Layer (SSL)
Security Awareness Training & Education

16. Intranets (B2E)
“Private corporate network that uses Internet technology and is designed to meet the needs of employees”

17. Extranets (B2B)
“Private corporate network designed to meet the needs of external parties such as suppliers, customers, and stockholders”

18. The 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

19. Future Directions
 Electronic commerce
 Bandwidth
Internet of Things (IoT)
IPv undecillion versus 4.3 billion 340,000,000,000,000,000,000,000,000,000,000,000,000
Ubiquitous Access (wireless/mobile)