The Internet

The InternetNetwork - Collection of computers and

devices connected together via communications devices

Internet - Worldwide collection of networks that links millions of businesses, government agencies, educational inst. And individuals

History of the InternetAdvanced Research Projects Agency (ARPA)

- Agency of U.S. department of defense -Became functional in 1969Allow scientists to communicateWould be functional even if part of the network were destroyed - nuclear attack

History (Continued)1969 - Four hosts1984 - 1,000 hostsToday - Over 100,000,000World Wide Web Consortium- (W3C) -

Group to oversee research and set standards for the internet.

Service ProvidersISP - Business that has permanent internet

connections and provides temporary connections to individuals and companies for a fee.

POP - Point of Presence - Dial up connection

Service Providers (Cont.)Regional ISP - Provides access to the

Internet through one or more phone numbers - Ex. Dmcom, catskill online

National ISP - Provides numbers for major cities and towns throughout U.S. Ex. Earthlink, AT&T

ISP’s (Cont)Online Service Provider - (OSP) Like an ISP,

but has many members only services - AOL, MSN, Compuserve

Wireless Service Provider - Provides wireless Internet access to users with wireless modems

Connecting to the InternetLocal Area Network - Schools and

businesses connect through their Lan via usually a T1 connection 1.55 mps.

Dial Up - Use your computer, modem, and regular phone line - 56k max.

Digital Subscriber Line - DSL - provides high speed connections over regular phone lines.

Connecting to the Internet (Cont)Cable Modem - Provides high speed

Internet connections through cable television network.

How Data Travels the InternetServer - Computer that manages resources

on a network and provides for central storage.

Client - Computer that can access the contents of the storage area on the server.

On the internet, your computer is a client accessing info. From servers called hosts.

Internet AddressesIP Address - Internet Protocol Address -

Number which uniquely identifies each computer or device on the internet

Navigating The WebHome page - Starting page for a browserHyperlink (Link) - Built in connection to

another related page or siteURL - Uniform Resource Locator (Web

Address)

URLUniform Resource Locator (URL)Example

http://www.jefferson.stier.org/JCS/JCSCODE.htmProtocol – http: (hypertext transfer protocol)Domain name: www.jefferson.stier.org – This

identifies the web server where the web document is located.

Path - /jcs/File name – jcscode.htm

The path and the file name indicate where the document is stored on the computer.

World Wide WebMosaic - Graphical User Interface. What we

now know to be WWWHTML - Hypertext Markup Language.

Program used to make web pagesHTTP - Hypertext Transfer Protocol -

Protocol used by the WWW