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Abstraction, Privacy, and the Internet

Abstraction, Privacy, and the Internet. What is Abstraction?. “The act of withdrawing or removing something” “The act or process of leaving out of consideration one or more properties of a complex object so as to attend to others”. Abstraction in Art.

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Abstraction, Privacy, and the Internet

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  1. Abstraction, Privacy, and the Internet

  2. What is Abstraction? • “The act of withdrawing or removing something” • “The act or process of leaving out of consideration one or more properties of a complex object so as to attend to others”

  3. Abstraction in Art “It is easy to make something simple sound complex, however it is more difficult to make something complex sound simple.”

  4. Abstraction in Life

  5. Abstraction in Life

  6. Abstraction in BYOB - Procedural

  7. Abstraction in CS “Writing (good) computer programs is the ability to handle abstractions in a precise manner.” - Keith Devlin

  8. Abstraction and the Internet – IP Addresses • 70.230.24.81 • 32-bit • Each block is an 8 digit binary number • Dynamically assigned (DHCP – Dynamic Host Configuration Protocol) • Laptop • Static IP address • Web server

  9. Abstraction and the Internet – IP Addresses 198.168.000.001 What is an IP Address? What does an IP address look like? What is its scheme? How many unique IP addresses could that scheme produce? What is IPv6? http://computer.howstuffworks.com/dns.htm

  10. Abstraction and the Internet – Domain Name Server • Domains have a hierarchy • http://cs.ua.edu • EDU – top-level domain • Accredited post-secondary educational US institutions • UA – University of Alabama • CS – Computer Science department

  11. Information sent in Packets • Packet consists of two types of data • Control information: source, destination, error detection, sequence • User data • Some systems send packetspersistently to avoid collisions • Delivery not guaranteed • How is it sent?

  12. Protocols • Networks speak the way people do • Speaking has certain rules • Speak the same language (English, Spanish, …) • One person speaks at a time • Interruptions are disruptive • Speak with the proper volume • Don’t speak for too long Pete Siemsen - http://nets.ucar.edu/nets/presentations/itn/

  13. Protocols • By using a protocol, we know • The syntax of a message • Fields/format • The semantics of a message • Meaning; may illustrate error • What actions required after receiving the message • If error received, the file may need to be resent

  14. TCP/IP • Created by DARPA in 1970s • Transmission Control Protocol and Internet Protocol • Also known as Internet Suite Protocol • IP moves packets of data from source to destination based on a four byte destination address • TCP verifies the correct delivery of data

  15. Bits Behind the Scenes

  16. Internet Protocols

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