Packets, Frames, Bits, and the OSI Model

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Join David for an overview of the OSI Model and an explanation of packets, frames, and bits. Wi-Fi very specifically operates at layer 1 (physical) and layer 2 (data link). At layer 3 (network), an IP header is added to the data that came from layers 4-7. A layer 3 IP packet, or datagram, encapsulates the data from the higher layers. A MAC header is added at layer 2 (data link), and the IP packet is encapsulated inside a frame. The frame is then sent to layer 1 (physical), where data is modulated into bits. A bit is a binary digit, taking a value of either 0 or 1. Binary digits are a basic unit of communication in digital computing. A byte of information consists of 8 bits. An octet is another name for a byte of data.

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