Introduction to the Internet • What is the Internet? • What is a Network? • Use Netscape • Mike Menchaca • email@example.com
What is the Internet? • To understand what the Internet is, we must first learn some networking basics
What is a Network? • Wire, we use a lot of wire • To get info. from one machine to another, one talks & the other listens • Vice-Versa.
Sharing the Wire • Instead of running a wire from every machine to all the other machines, we share a single wire among them • One machine talks while the others listen
Taking Turns • Packets: All machines agree to use the wire for a short bursts of information • Protocol: The agreement on how to pass information on the wire • The Internet uses a protocol called TCP/IP • or, Transport Control Protocol/Internet Protocol
Small Network • We have ten machines sharing a wire and each packet takes 1/100th of a second to send • If everyone is talking then they can say something every 1/10th of a second
Large Network: Too Much Info! • But what if you have 1,000 machines on a wire? • Then, they can only talk every 10 seconds! • This wouldn’t work in the real world
Router Traffic Control • To keep down the amount of traffic on a wire, we use routers • The router listens to packets on one wire and passes only packets destined for another wire.
Routers • Thus, routers connect two or more networks together to form bigger networks Internet Cloud
What is the Internet? • So what is the answer to our original question • In addition, each machine on a network has a unique address to identify it • For the TCP/IP protocol the address is made of four numbers seperated by periods (220.127.116.11)
www.aol.com 18.104.22.168 Domain Name Server Domain Name Service • However, numbers are hard to remember • We like to use names instead of numbers • The DNS keeps a record of host names and their respective numbers