OSI Model

Noun · Development

Definitions

  1. A seven-layer conceptual model for understanding network communication: Physical (1), Data Link (2), Network (3), Transport (4), Session (5), Presentation (6), Application (7). While real protocols don't map perfectly, the model provides a shared vocabulary — 'Layer 7 load balancer' means it understands HTTP.

    In plain English: A seven-layer model for understanding how data travels across a network, from electrical signals to web pages.

    Example: "The firewall operates at Layer 4 (TCP) — it can block ports but can't inspect HTTP headers. You need a Layer 7 WAF for that."

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