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In the Open Systems Interconnection (OSI) model, physical signals correspond to the bottom layer, while user software corresponds to the top layer.

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Updated 2026-09-06

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Anatomy of the Internet: Core Protocols and Packet Delivery @ University of Michigan - Ann Arbor

Ch.1 Networking Fundamentals and Architecture - Anatomy of the Internet: Core Protocols and Packet Delivery @ University of Michigan - Ann Arbor

Layered Models and Encapsulation - Anatomy of the Internet: Core Protocols and Packet Delivery @ University of Michigan - Ann Arbor