Intro to MIS – MGS351 The World Wide Web and the Internet Extended Learning Module B

Chapter Overview m What is the Internet? – Overview of various Internet Services m How does the Internet work? m The World Wide Web m Security and the Internet m Intranets and Extranets m 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? m Two or more networks joined together (i) m Worldwide group of connected networks that allow public access to information and services (I) m No central governing body m Estimated 2.8 billion users m Roughly 39% of the world population

Internet Statistics - Hosts

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

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

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

Internet Addresses m IP (Internet protocol) address – (IPv4) – 2002:80CD:2EB:0:0:0:0:0 (IPv6) m Domain name – mgt.buffalo.edu m Domain Name System (DNS) m Domain name servers nslookup in Windows host in UNIX

World Wide Web m 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 Page m Uniform Resource Locator (URL) m Hypertext transfer protocol ( m Hypertext markup language (HTML) m Hyperlinks

Uniform Resource Locator

Web Page Do’s and Don’ts m Keep your pages small m Limit graphics on pages to keep them “light” m Reuse graphics and avoid animations m Balance images and text m Test...test...test… m Know your customer

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

Security Solutions m Authentication / Authorization m Firewalls m Intrusion Detection Systems m Data Encryption m Secure Sockets Layer (SSL) m 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 m 24 / 7 access m Global presence m Lower marketing costs m Two-way communications m Lower product display and storage costs m Lower salesperson costs m Electronic commerce opportunities

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