What is needed for successful communications? ending Communications Communications device - initiates device-connects channel- media instruction to the sending device to on which data transmit data the communications instructions, or instructions, or channel information travel information Communications Receiving device -connects device -accepts the communications transmission of data channel to the instructions or receiving device information
7 Sending device — initiates instruction to transmit data, instructions, or information What is needed for successful communications? Communications device — connects the communications channel to the receiving device Receiving device — accepts transmission of data, instructions, or information Communications device — connects the sending device to the communications channel Communications channel — media on which data, instructions, or information travel
Everything is Connected to Everything Computer Network: A collection of computers, display terminals, printers, and other devices linked either by physical or wireless means Seeds of Networking 1966: ARPA(Advanced research Projects Agency) State Defense Departments research organization Focused major development effort on computer networking ARPAS Goal: To promote research in advanced future technologies by funding university and industry research proposals Result: Thousands of databases became available to the public
Computer Network: A collection of computers, display terminals, printers, and other devices linked either by physical or wireless means. Seeds of Networking ◦ 1966: ARPA (Advanced Research Projects Agency) State Defense Department’s research organization. Focused major development effort on computer networking. ARPA’s Goal: To promote research in advanced future technologies by funding university and industry research proposals. Result: Thousands of databases became available to the public
Everything is Connected to Everything Computer Networking Internet: A world-wide network connecting millions of computer networks for the purpose of exchanging data and communications using special rules of communication internet: (lower case 1) Any network connecting two or more computer networks Going online: Connecting to a collection of interconnected computers on a network Do bankin Pay bills Buy groceries Book vacation travel Send messages Participate in discussions · Do research · Play games
Computer Networking • Internet: A world-wide network connecting millions of computer networks for the purpose of exchanging data and communications using special rules of communication. • internet: (lower case i) Any network connecting two or more computer networks. Going online: Connecting to a collection of interconnected computers on a network. • Do banking. • Pay bills. • Buy groceries. • Book vacation travel. • Send messages. • Participate in discussions. • Do research. • Play games
Everything is Connected to Everything Instant Web E-Mail Messaging Internet Chat rooms Newsgroups Telephony Fax machine Web Video FTP or Computer Folders Conferencing Fax modem
10 Web E-Mail Instant Messaging Internet Telephony Chat Rooms Newsgroups Web Folders Fax Machine or Computer Fax/Modem Video Conferencing FTP
Internet basics The Internet backbone Major internet communication links Network/Internet service provider(NsP/IsP Construct and maintain the Internet back bone such as at&t Network access point(NAP)-point on the Internet where several connections converge Han Fala United States
The Internet Backbone Major internet communication links. Network/Internet service provider (NSP/ISP) ◦ Construct and maintain the Internet backbone, such as AT&T Network access point (NAP) – point on the Internet where several connections converge