CS100 Lecture Notes - Lecture 2: Digital Subscriber Line, Internet Message Access Protocol, Wi-Fi

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

Document Summary

Network: all the components that are connected together so that two computers can communicate with each other. Synchronous:when both parties are communicating at the exactly the same time(real time) Asynchronous:when there is a time lag in the communication (post card) When you sent a message it goes from the highest to the lowest, When you receive a message it goes from the lowest to the highest. 4different physical layers: ethernet, phone,adsl and cable modems, wi , cellular(3g/lte) Ethernet: connection device requires unique identi er mac(media access control) address, party (will talk at the same time, cable grades&speeds (one device that slower, it may slow done all the device) Phone,adsl and cable modems: phone modems (tones of the connection in old phone systems, 2-device communication ( one modems to another, adsl(asymmetric(download is much faster, upload are slower) digital subscriber line, cable modems(tv)