Code.org Unit 2 : The Internet vocabulary

Computing Device

a machine that can run a program, including computers, tablets, servers, routers, and smart sensors

Computing System

a group of computing devices and programs working together for a common purpose

Computing Network

a group of interconnected computing devices capable of sending or receiving data.

Path

the series of connections between computing devices on a network starting with a sender and ending with a receiver.

Bandwidth

the maximum amount of data that can be sent in a fixed amount of time, usually measured in bits per second.

Protocol

An agreed-upon set of rules that specify the behavior of some system

IP Address

The unique number assigned to each device on the Internet.

Internet Protocol (IP)

a protocol for sending data across the Internet that assigns unique numbers (IP addresses) to each connected device

Router

A type of computer that forwards data across a network

Redundancy

the inclusion of extra components so that a system can continue to work even if individual components fail, for example by having more than one path between any two connected devices in a network.

Fault Tolerant

Can continue to function even in the event of individual component failures. This is important because elements of complex systems like a computer network fail at unexpected times, often in groups.

HTTP

HyperText Transfer Protocol - the protocol used for transmitting web pages over the Internet

Internet

a computer network consisting of interconnected networks that use standardized, open (nonproprietary) communication protocols.

Packet

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

Packet Metadata

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

Routing

the process of finding a path from sender to receiver.

UDP

A protocol used on the internet for fast transmission of information but with minimal error checking

World Wide Web

a system of linked pages, programs, and files.

Certificate authority

issue digital certificates that validate the ownership of encryption keys used in secure communications and are based on a trust model .

Digital Divide

differing access to computing devices and the Internet, based on socioeconomic, geographic, or demographic characteristics