What question did this study set out to answer?

The aim is to provide a practical understanding of the OSI model by disassembling an HTTP GET request.

July 29, 2026Open Access

Getting a Real Feel for the OSI Model — Dissecting a Single HTTP Request Into Its Seven Layers (archived 2026-07-27)

Key Points

The aim is to provide a practical understanding of the OSI model by disassembling an HTTP GET request.
Constructed and dissected an Ethernet frame carrying an HTTP GET request in C#.
Utilized hex dumps and Wireshark to visualize layer nesting from L2 to L7.
Outlined the mapping of OSI layers to .NET APIs such as HttpClient, SslStream, and Socket.
Successfully demonstrated how L2 through L7 layers are nested as a byte sequence.
Corrected common misconceptions about the OSI model using practical examples.
Provided a clear mapping of each OSI layer to corresponding .NET APIs.

Abstract

Understand the OSI model through the real thing instead of rote memorization. We assemble and dissect, in C#, the Ethernet frame carrying a single HTTP GET request, and confirm with a hex dump and Wireshark how L2 through L7 are physically nested as a byte sequence. We cover the mapping between each layer and .NET APIs (HttpClient / SslStream / Socket), troubleshooting using layer vocabulary, and correcting common misconceptions, all from a practical standpoint. Archived version of https://comcomponent.com/en/blog/osi-model-packet-anatomy/, as published on 2026-07-27. The live article is maintained and may change after this date. First published 2026-07-04.

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