Unit 11- The Internet
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a network of networks, a way for machines and humans to communicate, open agreed upon protocols
What is the internet
Widely agreed upon set of rules that standardized communication between machines, this makes the internet work
What is a protocol
Crowdsourcing, Dissemination of information, Entertainment, legal and ethnic concerns
Impacts of the internet
Physical object that can run a program
Computing Devices
computing devices that are used to take in information from a user or another device
Input device
router, modem
Computer input and output
computing devices that are used to send computer data to the user
output device
Computing devices that remember information
Storage Devices
computing devices that are used for communication between computers
Network devices
a group of computer systems linked together
Network
A group of computers connects to a router, A router is used to connect to another central router
how the internet works
Electricity (ethernet), light (fiber optic), Radio waves (Cell tower, router)
physical transfer of data
The capacity of data transfer in a system
Bandwidth
The time it takes for a bit to get from sender to receiver
Latency
The agree upon protocol that defines the layout of an internet address
Internet Protocol (IP address)
where the resource is
Domain
what resource you are requesting
Path
URL is entered, The request is sent, The response back, Page is rendered
how to view website
check cache to see if location has already been saved If not, Ask a root server, ask a Top Level Domain, Ask second level domain for any subdomains
how does Domain Name System (DNS) work
what is a DNS
a heiarchy
the process of sending data between two computers on the internet.
Routing
multiple paths existing between two points
Redundancy
the units of data that are being sent
Packets
completes one task at a time; Slowest way to compute, Easy to find bugs, no setup needed
Sequential Computing