Collegeboard 4.1 Video Notes

Video 1:

  • packet- small amount of data sent over a network, each packet includes the source and the destination of information
  • computer system- group of computing devices and programs working together for a joint purpose
  • computer network- type of computing system, group of interconnected computing devices capable of sending or receiving data
  • packet switching- message is broken up into packets and sent in any order, packets are reassembled by the recipient’s device
  • routing- process of finding a path from sender to receiver
  • path- sequence of directly connected computing devices that begins at sender and ends at receiver
  • bandwidth- maximum amount of data that can be sent in fixed amount of time on a computer network

Review Questions: 1a 2e 3b 4c 5d 6f

Video 2:

  • protocol- agreed upon set of rules that specify the behavior of a system
  • OSI- layers you go through to communicate, 7 groups of protocols- physical, data link, network, transport, session, presentation, application.
  • IETF- manages development of standards and technical discussions concerning the internet in an open and collaborative process
  • TCP- establishes a common standard for how to send messages between devices on the internet
  • packet contains data that is being transmitted as well as metadata containing info used for routing info
  • internet is scalable- can change in size and scale to meet new demands
  • local area network (LAN)- physical connections limited by hardware and physics
  • intranet- LANs connected by Routers within an organization
  • AS- large Intranets linked together under the control and policies of major organizations. Large routers ink networks with large telecommunications connections
  • the internet- autonomous systems linked together.
  • transport layer- how packets are sent, and for what
  • web server- programs running on machines connected to the internet
  • domain name service- applications that translate a human readable URL
  • www- network of linked data and programs running over the internet, NOT the internet

Review Questions- TFFTFFT

Important Diagrams:

Narrow Neck:

OSI Model: