Collegeboard Unit 4.1 “The Internet” VIDEO 1 (xxx)

  • Long time ago computers worked in isolation without any help from other users
    • Computers NEED to talk to each other
  • ARPANET was an idea that was around before the internet
  • A packet is a small amount of data sent over a network
    • Each packet also includes the source and the destination information
  • A computer SYSTEM is a group of computing devices and programs working together for a joint purpose
  • A computer NETWORK is a group of interconnected computing devices capable of sending or receiving data (this is a type of computing system)
  • Packet Switching is the message that is broken up into packets and sent in any order.
    • the packets are reassembled by the receipient’s device
  • Routing is the process of finding a path from sender to receiver
  • A path between two computing devices on a computer network (a sender and a receiver) is a sequence of directly connected computing devices that begins at the sender and ends at the receiver

Collegeboard Unit 4.1 “The Internet” VIDEO 2

Computer Protocol Models

  • OSI (Open Systems Interconnect)
    • 7 groups of protocol
  • TCP (Transmission Control Protocol)
    • established a common standard for how to send messages between devices on the internet
  • Internet Engineering Task Force manages the development of standards and technical discussions concering the internet in an open and collaborative process
  • A packet contains data that is being transmitted as well as metadata containing information used for routing information
  • Kep Protocols used at the Application Layer
    1. http
    2. https

Some Unclear topics

  • “Routers are special purpose computer with a MAC ADDRESS”
  • “Arpanet”