The document provides an introduction to the Internet, describing it as numerous interconnected computer networks that allow access to a wide variety of information. It notes that the Internet has experienced exponential growth, connecting over 6000 networks and adding over 1000 hosts per day. Domain names are used to identify specific networks and computers, and are read from right to left with country codes and site identifiers specifying the location. E-mail addresses identify individual users separated by the @ sign. Popular services on the Internet include e-mail, telnet, usegroups, the World Wide Web, Internet Relay Chat, and File Transfer Protocol.

1. Introduction to the Internet

2. What is it Numerous computer networks interconnected

3. What’s on it Anything you can think of is at your fingertips, if you know where to look.

4. Internet Growth * Logarithmic Scale

5. Interesting Facts Internet now connects over 6000 other networks More than 1000 hosts are added each day Traffic grows at 10% per month (120% per year) Over 10 million people are directly connected Over 25 million are indirectly connected Source: Navigating the Internet

6. Domain Names Domains identify specific networks and computers on the internet. Examples: whitehouse.gov search.org chip.ucdavis.edu library.latrobe.edu.au 139.147.42.4

7. Reading Domain Names Right to left signifies the broadest to most specific Country code Type of site Site ID Computer or network at that site chip.ucdavis.edu.us

8. Country Codes There are over 220 countries connected to Internet Each is identified by a two-character code for international mail Examples: .US = United States .DE = Germany .TW = Taiwan .AU = Australia .CH = Switzerland

9. Type of Site The type of site is a three character identifier preceding the country code (if a country code is used) Examples : .com = Commercial (cserve.com) .edu = Educational (ucdavis.edu) .gov = U.S. Government (whitehouse.gov) .mil = U.S. Military (af.mil) .net = Network Information / Operations Centers (nyser.net) .org = Non-profit Organizations (search.org)

10. E-Mail Addresses Identify a specific user at a site separated by the “@” sign Examples: [email_address] [email_address] [email_address] [email_address] [email_address]

11. Using the Net E-Mail Telnet USEGROUPS WWW (World Wide Web) IRC (Internet Relay Chat) FTP (File transfer Protocol)

12. Lets Go Surfin’