COMMERCE 2KA3 Lecture Notes - Lecture 6: Wide Area Network, Satellite Internet Access, Packet Switching
25 Mar 2018
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Chapter 7: telecommunications, the internet, and wireless tech. Hubs - send messages in a network; don"t know the exact destination. Switches - intelligent; know the exact destination of the message. Routers: you need it to connect to a network; connect your network to another network. Dominant model for achieving connectivity among different networks. Provides a universally agreed-on method for breaking up digital messages into packets, routing them to the proper address, and then reassembling them into coherent messages. Ways to communicate a message in a network. Up to 500 metres (half a mile); an office or floor of a building. Up to 1000 metres (a mile); a college campus or corporate facility. Stands of copper wire twisted in pairs for voice and data communication; run of. Thickly insulated copper wire; run of more than 100 meter. Stands of clear glass fibre, transmitting data as pulse of light; often used for network backbone.
