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13 cards from this deck
Groups of protocols that handle different parts of communication
Each layer performs its task independently of others
Adjacent layers only
Four
Controls physical hardware connecting hosts (NIC, cabling)
Makes connections, controls packet switching, directs data packets
Controls data flow and splits data into packets
Selects correct protocol depending on application
Each layer can be updated independently without affecting others
Standards ensure different manufacturers' devices can work together
Problems can be isolated to a specific layer
Transport Layer
HTTP, FTP, SMTP
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