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Introduction to the Internet What is the Internet? What is a Network? Use Netscape Mike Menchaca chaka@csus.edu 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
Introduction to the Internet
  • What is the Internet?
  • What is a Network?
  • Use Netscape
  • Mike Menchaca
  • chaka@csus.edu
what is the internet
What is the Internet?
  • To understand what the Internet is, we must first learn some networking basics
what is a network
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
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
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
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
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
traffic control

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

Internet

Cloud

what is the internet10
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)
domain name service

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