OSI layers

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Last updated 12:05 AM on 4/16/26
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8 Terms

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Layer 1

Physical Layer: Transmits raw bit streams over the physical medium (cables, hubs, repeaters). Data unit: Bits.

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Layer 2

Data Link Layer: Node-to-node data transfer, error detection, and physical addressing via MAC addresses (switches, bridges). Data unit: Frames.

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Layer 3

Network Layer: Routes data between different networks using logical IP addresses (routers). Data unit: Packets.

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Layer 4

Transport Layer: Ensures reliable, end-to-end data delivery, flow control, and error recovery (TCP/UDP). Data unit: Segments.

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Layer 5

Session Layer: Establishes, maintains, and terminates communication sessions between applications.

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Layer 6

Presentation Layer: Translates, encrypts, and compresses data so it can be understood by the application layer.

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Layer 7

Application Layer: Provides network services directly to user applications (HTTP, HTTPS, FTP, SMTP, DNS).

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OSI Mnemonic (Top-Down)

All People Seem To Need Data Protection (Application, Presentation, Session, Transport, Network, Data Link, Physical).