Big Idea 4: Computer Systems and Networks

https://www.geeksforgeeks.org/how-does-the-internet-work/ - info https://www.khanacademy.org/computing/code-org/computers-and-the-internet/internet-works/v/the-internet-wires-cables-and-wifi

Bandwidth

Volume of information that can sent over a path in fixed amount of time. megabits per second

Distributed computing system

Collection of multiple computers with multiple processors that solve large scale problems.

Fault-tolerant

A system is still able to function even if there are broken nodes.

HTTP

Hypertext transfer protocol facilitates communication between web browsers and web servers.

IP address

Internet protocol address is a unique identifying number assigned to every device located on internet. Identifies host, network. We use IP v6 which has 128 bits compared to IPv4 which only has 32 bits. Difference is 2^96!

Parallel computing system

Dividing tasks into multiple streams on one computer. Get the job done faster.

Redundancy

Fail-safe method of duplicating paths so if one shuts down, the router routes the data on another path to same place.

Sequential computing system

Completing tasks one step at a time on one computer with one processing unit.

TCP

Transmission Control Protocol ensures successful delivery of messages across internet. High level protocols rely on tcp like FTP (file transfer protocol), smtp (simple mail transfer protocol) and HTTP

UDP

User data gram protocol delivers data without ensuring it is complete for faster processing and cheaper setup

WWW

Worldwide web is the software basis of internet that includes browsers, webpages, hyperlinks, images, videos, social networking.

Latency

The delay time between user connection/request and return. High latency = slower. Low latency = faster.

Speed

Actual Amount of data downloaded while bandwidth is the possible time