CS100 Lecture Notes - Lecture 3: Media Access Control, Physical Layer, Wi-Fi

• School: University of Waterloo
• Department: Computer Science
• Course: CS100
• Professor: Dave Tompkins

Document Summary

2. 1 basic communication: network: everything that connects computers and decisions to allow them to communicate with each other. Internet is the largest computer network in the world: every layer of communication has protocols (rules) Synchronous: both parties are communicating at exactly the same time, asynchronous, text message is embedded with the time stamp, time lag in the communication. 2. 2 physical layer: three layers of how communication on the internet works over computer network, low layer (physical layer, physical interactions and components, middle layer (tcp/ip) interpretations, high layer (protocol) Less cost-effective than wi-fi and drains battery: devices need an imei (international mobile station equipment identity), each device has a unique one, devices can be locked into a particular cell phone carrier. 2. 3a: ip: two separate layers, higher layer (tcp, alternate known as udp or user datagram protocol, lower layer (ip) Some domains are being control, e. g. ca, .