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Introduction to the Internet What is the Internet? What is a Network? Use Netscape Mike Menchaca [email protected] 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

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Introduction to the internet l.jpg
Introduction to the Internet

  • What is the Internet?

  • What is a Network?

  • Use Netscape


What is the internet l.jpg
What is the Internet?

  • To understand what the Internet is, we must first learn some networking basics


What is a network l.jpg
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.


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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


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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


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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


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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


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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.


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Routers

  • Thus, routers connect two or more networks together to form bigger networks

Internet

Cloud


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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 (130.86.90.1)


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www.aol.com

152.163.202.70

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


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