The Internet Layers — An In-Depth Breakdown of PDU Contents

This article originally appeared on vahid.blog.

In Part II, we learned how an HTTP request travels across the Internet to the correct destination server, through several layers, and returns with a response. But how does this happen reliably and securely, without becoming corrupted or being intercepted by a malicious hacker? And what’s HTTPS?

To be able to answer these questions, we need to first dig deeper into what each layer’s protocol data unit (PDU) contains. In this process, we’ll appreciate how each layer contributes to reliability. …

Vahid Dejwakh

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