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CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
CS101 Lecture 14 Internet Connections
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CS101 Lecture 14 Internet Connections

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  • 1. CS101 Lecture 14 Internet Connections
  • 2. How do you connect to the Internet?
    • Users must cross the “____ ____”
    • How do most people connect their single computer or home network to the Internet?
      • They use an I.S.P. (_______ _______ _______) to cross the last mile =
  • 3. How do you find an ___?
    • Most people let advertisements determine their ___
    • Better way is to use an ___ search and review engine
      • Broadband Reports
      • Example is The List
      • Google “___” to find them
  • 4. What should you look for in an ___?
    • The connection _____ you need
    • Good Price with short or no _______
    • Unlimited time online (starting to monitor usage)
    • ____ trial period (30 days min)
    • Good ____ support
    • Multiple ____ accounts
    • ___ hosting space
    • Free software
      • Virus, Adware, Spyware, and Firewall
  • 5. Once you get your ISP check your connection speed
    • Once you sign up with an ISP check out that you are getting the __________ (connection speed) for which you are paying by using test web sites.
    • Test web sites:
      • Speed Test
      • DSL Reports
      • CNET
      • Lots of others
  • 6. How fast is that?
    • Your connection to the Internet should be how fast?
      • Faster is better. Faster is more expensive.
    • How fast a connection should you pay for?
      • To answer that question we need to relate speed to tasks.
  • 7. Speed of a common Internet task
    • How long would it take to download a 49 megabyte file as certain speeds
      • 49 megabyte file could be:
        • A high quality song
        • A short video
        • A software update
        • A batch of photos
        • Etc
    • How long would it take at 47 kbps ($5 Month)
    • How long would it take at 1.5 Mbps ($20 Month)
  • 8. How to calculate download times at given connection speeds
    • Figure out how many ____ are in the file you need to download
    • Figure out how many ____ per second your connection can download
    • Divide the total number of ____ that must be downloaded by the number of ___ that can be downloaded per second to get the number of seconds needed to download your file
    • Divide the seconds by 60 if you want to convert the time to minutes
  • 9. Example 1 = 49 megabyte file and 47 kilobit per second connection
    • Figure out how many bits are in the file you need to download
    • 49 megabytes * 1024 *1024 * 8 = 411,041,792 bits
      • First 1024 converts megabyte to kilobytes
      • Second 1024 converts kilobytes to bytes
      • The 8 coverts bytes into bits
    • We will need to download 411,041,792 bits from the Internet to our computer.
  • 10. Example 1 = 49 megabyte file and 47 kilobit per second connection
    • Figure out how many bits per second your connection can download
    • 47 kbps * 1000 = 47,000 bits per second
      • The 1000 converts kilobits into bits
  • 11. Example 1 = 49 megabyte file and 47 kilobit per second connection
    • 3 ) Divide the total number of bits that must be downloaded by the number of bits that can be downloaded per second to get the number of seconds needed to download your file
    • 411,041,792 bits / 47,000 bits per second = 8745.6 seconds
  • 12. Example 1 = 49 megabyte file and 47 kilobit per second connection
    • 4 ) Divide the seconds by 60 if you want to convert the time to minutes
    • 8745.6 seconds / 60 = 145.8 minutes
    • (or about 2hrs and 26 minutes)
  • 13. Example 2 = 49 megabyte file and 1.5 megabits per second connection
    • Figure out how many bits are in the file you need to download
    • 49 megabytes * 1024 *1024 * 8 = 411,041,792 bits
      • First 1024 converts megabyte to kilobytes
      • Second 1024 converts kilobytes to bytes
      • The 8 coverts bytes into bits
    • We will need to download 411,041,792 bits from the Internet to our computer.
  • 14. Example 2 = 49 megabyte file and 50 gigabit per second connection
    • 2) Figure out how many bits per second your connection can download
    • 1.5 Mbps * 1000 * 1000 = 1,500,000 bps
      • The first 1000 converts megabits to kilobits
      • The second 1000 converts kilobits into bits
  • 15. Example 2 = 49 megabyte file and 1.5 megabits per second connection
    • 3 ) Divide the total number of bits that must be downloaded by the number of bits that can be downloaded per second to get the number of seconds needed to download your file
    • 411,041,792 bits / 1,500,000 bits per second = 274 seconds
  • 16. Example 2 = 49 megabyte file and 1.5 megabits per second connection
    • 4 ) Divide the seconds by 60 if you want to convert the time to minutes
    • 274 seconds / 60 = 4.5 minutes
  • 17. Best Value?
    • $5 = 145 minutes or $20 = 4.5 minutes
    • 4 times the amount of money per month for 32 times faster download
  • 18. Common Connection Types
    • Non Broadband Connections
      • Phone related
        • Dial-up
        • Enhanced Dial-up
    • Broadband Connection (Anything ____ then dial-up)
      • Phone related
        • DSL
        • ISDN
        • Cell Phone Networks
      • Non phone related
        • Cable
        • Broadband Over Power Line (BPL)
        • Satellite
        • Fiber Optic
        • Max WiFi

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