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Physical 1
Transmits raw bits through physical media such as cables
Data Link 2
Handles local frame delivery and MAC addresses.
Network 3
Handles logical addressing and routing packets
Transport 4
Supports end-to-end transport and port numbers
Session 5
Establishes, manages, and ends communication sessions
Presentation 6
Translates, encrypts, and compresses data
Application 7
Provides network services to applications used by people