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VIRTUAL PACKETS
These data packets serve same reason in Internet as frames on LAN. Every packet has a header. Routers, which are normally gateways, transfer packets between physical networks.
These data packets have a uniform hardware-independent message format. They add header and data and can't use format from any particular system. They are closed in hardware frames from delivery across every physical network.
COLLISION: The receiver can get simultaneous requests, which gives in collision at receivers and both service lost and in this way no transmitter accepts reservations and both use
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