ITM 102 Lecture Notes - Lecture 7: Packet Switching, Network Interface, Telephone Network
29 Sep 2017
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Document Summary
What is a computer network: two or more connected computers, major components in simple network. Hubs, switches, routers: software-defined networking (sdn): Functions of switches and routers managed by central program. Corporate network infrastructure: hundreds of local area networks (lans) linked to firmwide corporate network, various powerful servers. Backend systems: mobile wireless lans (wi-fi networks, videoconferencing system, telephone network, wireless cell phones. Method of slicing digital messages into parcels (packets), sending packets along different communication paths as they become available, and then reassembling packets at destination. Previous circuit-switched networks required assembly of complete point-to- point circuit. Packet switching more efficient use of network"s communications capacity. Protocols: rules that govern transmission of information between two points. Transmission control protocol/internet protocol (tcp/ip: common worldwide standard that is basis for internet. Different layers: application layer, transport layer. Modem: translates digital signals into analog form (and vice versa: signals: digital versus analog, types of networks. Local-area networks (lans: ethernet, client/server vs. peer-to-peer.
