N10-009 - Networking Concepts - Section 1.1

Explain concepts related to the Open Systems Interconnection (OSI) reference model and map common protocols and devices to each layer.

Identify the seven OSI layers - physical, data link, network, transport, session, presentation, and application - and explain the data unit and addressing each layer uses. Map common devices and protocols to their layer (a switch and MAC frames at Layer 2, a router and IP packets at Layer 3) and trace encapsulation as data moves down the stack.

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