COMP247 Lecture Notes - Lecture 1: Multidrop Bus, Amplitude Modulation, Broadcast Domain
22 Oct 2018
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Document Summary
Networks: an interconnected group or system, connects groups of computers and provides a medium for sharing of resources; Circuit switched networks: point-to-point, exclusive, creation and termination. Packet switched networks: multiple paths, no setup, shared. Point-to-point networks: connection to mainframe at one point, half duplex links, computers take turns transmitting. Multi-drop networks: connection to mainframe is shared by multiple hosts, multiple termination points, can be bridged to form connections between other networks, must control access, ensures no two computers attempt to transmit at the same time. Switch central device to plug servers into the network, forward a message. Physical topology: layout of physical installation of the network. Collision domain: when two stations transmit at the same time collision occurs. Broadcast domain: division in a network, all nodes can reach each other. Centralised routing: decisions made by one central computer, used on small, mainframe based networks. Decentralised routing (distributed: decisions made by each node independently.
