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with packet switching the message is broken down into smaller parts(data packets)and these are sent individually through the network
Each packet has header which contain 3 pieces of important information: A source or return address to say where the packet originated from A destination address tell the packet where it has to go A sequence number so that the individual data packets can be resembled in the correct order once they have safely arrived at their destination.
layers: Rules organised into an order in which they need to be applied Positives: Reduces complexity Problems can be broken down into smaller more manageable parts Different developers can work on different parts to modify a system using layers It is important that layers are interoperable(they can work/communicate together)
which protocol will be used? FTP? Imap? pop? SMTP?HTTP? Https? Path is divided into packet's numbered. Routers operate here. Destination address are set. How will hardware connect between computers?:Ethernet/NIC/MAC addresses
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