Describe the OSI 7-layer model and the function of each layer.

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Answer: The OSI model defines seven layers of network communication:

Physical Layer: Electrical signals, cables, hardware
Data Link Layer: Frame formatting, MAC addresses, error detection
Network Layer: Routing, IP addressing, path determination
Transport Layer: Reliable delivery, segmentation (TCP/UDP)
Session Layer: Connection management, dialogue control
Presentation Layer: Encryption, compression, data formatting
Application Layer: User interface, network services
Memory aid: "Please Do Not Throw Sausage Pizza Away"

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