Code.org APCSP Unit 2- The internet

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24 Terms

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Computing Device

A machine that runs a program, including computer, routers, servers, etc

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Computing System

Group of computing devices and programs that are working together for a common purpose

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Computing Network

Group of interconnected computing devices that are able to send or receive data

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Path

Series of connection between computing devices on a network that start with a sender and ends with a receiver

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Bandwidth

The maximum amount of data that can be sent in a fixed amount of time

measured in bits per second

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Protocol

Agreed upon rules that specify the behavior of a system

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IP Address

Unique number assigned to each device on the internet

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Internet Protocol (IP)

Protocol for sending data across the internet that assigns IP addresses to each connected device

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Router

A type of computer that forwards data across a network

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Redundancy

Including extra components so that a system still can work even if individual components fail

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Fault Tolerant

Continues to function even in the event that individual components fail

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Importance of fault tolerance

Elements of complex systems like a computer network fail at unexpected times, usually in groups

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Datastream

Information passed through the internet in packets

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Packet

Chunk of data sent over a network. Larger messages are divided into packets that can arrive at a destination in order, out-of-order, or not at all

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Packet Metadata

Data added to packets to help them route through a network and reassemble the original message

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Transmission Control Protocol (TCP)

Protocol for sending packets that checks for errors to ensure all packets are received and are properly ordered

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User Datagram Protocol (UDP)

Protocol for sending packets quickly with minimal error checking and does not resend dropped packets

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Scalability

The capacity for the system to change size and scale to meet new demands

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Domain name system (DNS)

Responsible for translating domain names like ex.com into IP addresses

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World Wide Web

System of linked pages, programs, and files

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Hypertext Transfer Protocol (HTTP)

Protocol for computer to request and share the pages that make up the world wide web on the internet

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Digital Divide

Differing access to computing devices and the internet based on socioeconomic, geographic, or demographic characteristics

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Internet Censorship

The legal control or suppression of what can be accessed, published, or obtained on the internet

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