Terminology Index
Glossary
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Frame
The unit of data at the data-link layer of a network, wrapping a packet with addressing (MAC addresses) for delivery across a local network segment. It is the lowest-level container in the common networking models.
As data moves down the network stack, a packet (with IP addresses) is encapsulated into a frame that adds link-layer addressing (source and destination MAC addresses) for hop-by-hop delivery on a local segment. Understanding frames and how they relate to packets clarifies encapsulation, the OSI and TCP/IP models, and how addressing works at each layer, foundational for reading network behavior and certain link-layer attacks.
Introduced in: Networking Foundations
Examples
- A packet wrapped in an Ethernet frame with source and destination MAC addresses.
- Frames carrying data between devices on the same local network segment.
- Seeing how a frame encapsulates a packet as data moves down the stack.
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