CSC309H1 Study Guide - Midterm Guide: Yle, Railways Act 1921, Enterprise Javabeans
Document Summary
Built on open standard; anyone can create a new internet device. Everyone can use it with simple, commonly available software. The internet uses a layered hardware/software architecture ( osi model ). Simple protocol for attempting to send data between two computers. Each device has 32-bit ip address (using four numbers from 0-255). Left-to-right: network subnetwork subsubnetwork address. A set of servers that map written names to ip addresses. Many systems maintain a local cache called a hosts file. Adds multiplexing, guaranteed message delivery on top of ip. Multiplexing: multiple programs using the same ip address. Port: a number give to each program or service. Port 80 web browser, port 25: email, port 22 ssh. Some programs (games, streaming media programs) use simpler udp protocol. Why share research, data sets, and documents. Content generation change html data (w/ javascript, php, etc) Eg querying something on google or amazon generates the page. Software that listens for web page requests.
