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Published byStuart Shelton Modified over 9 years ago
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1 3 Computing System Fundamentals 3.4 Networked Computer Systems
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3.4.3 Network Protocols
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3 WANs vs. LANs They differ in size, but also: ‣ LAN's allow networked machines to listen and broadcast freely, with switches and bridges keeping the traffic manageable, ‣ WANs however use software switching technology to direct the traffic.
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4 WANs vs. LANs They differ in size, but also: ‣ LAN's allow networked machines to listen and broadcast freely, with switches and bridges keeping the traffic manageable, ‣ WANs however use complex software switching technology to direct the traffic.
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5 Protocols A protocol is a universally standard set of rules governing how devices communicate. It must include information on: ‣ handshaking (establishing the connection), ‣ data compression methods, ‣ end of message markers, ‣ confirmation of receipt, ‣ error checking methods.
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6 Protocols The commonest example on the internet is TCP/IP. The decision on which to use is based on speed, security, accuracy, reliability, simplicity, etc. e.g. Skype uses UDP because it is faster than TCP/IP. Essential both devices are capable of using the same protocol (very likely these days).
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