CIS 3210 Lecture Notes - Lecture 1: Packet Switching, Computer Network, Simple Mail Transfer Protocol

• School: University of Guelph
• Department: Computing and Information Science
• Course: CIS 3210
• Professor: Xiaodong Lin

Document Summary

A computer network is a set of computers connected together for the purpose of sharing resources. The internet is the most widely used computer network in the world. What"s the internet nuts and bolts view: billions of connected computing devices. Hosts == end systems (computer, phone, tablet, pi, etc. ) A device that connects to the internet (runs network apps: communication links. The way devices are connected to the network. Ex: ber optics, cables, radio, satellite, copper , etc. Transmission rate is in bandwidth, how fast can data be transferred across a link: packet switches. Devices that serve as hubs between communication links, the forward arriving packets from their incoming links to their outgoing links. The router takes an incoming packet and nds a way to forward it to the correct computer. Data is packaged into a packet in a special way (in order to be read by certain protocols.