Collegeboard 4.1

Notes on 4.1 Daily Video 1

  • Started with huge computers, evolved to smaller computers
  • A packet is a small amount of data sent over a network. Each packet includes the source and destination information.
  • A computer system is a group of computing devices/programs working together
  • A computer network is a group of interconnected devices that send/receive data
  • Packing switching: the message (file) is broken up into packets and sent in any order, the packets are reassembled at the destination
  • Bandwidth: max amount of data that can be sent in a fixed amount of time on a computer network (bits/second)
  • Route: process of finding a path from sender to receiver
  • Path: sequence of directly connected computing devices that begins at the sender and ends at the receiver

Notes on 4.1 Daily Video 2

  • Protocol: agreed upon set of rules that specify the behavior of the system
  • OSI: layers you have to go through to communicate, 7 groups of protocols
  • IETF: manages the development of standards and technical discussions concerning the Internet in an open/collaborative process
  • TCP: estasblishes a common standard for how to send messages between devices on the Internet
  • Network Access Layer: deals with the hardware
  • Internet Layer Data Transmission: packet contains data that’s transmitted as well as metadta containing information used for routing, Internet was designed to be scalable
  • Internet is Scalable: LAN, Intranet, Automonous System (tens of thousands of Intranets), Internet
  • Transport Layer: TCP (error checking/error recover, slower) and UDP (error checking but discards erroneous packets), port number assigned to an application or service
  • Internet Layer: unicast, multicast, broadcast
  • Application Layer: Web servers and DNS (maps names to IPs)

Diagram

Collegeboard Quiz

I got this question wrong, but I now understand the correct answer. The Inernet is dynamic and always changing, so basically open data protocols are just a way to standardize data transmission between networking and end devices.