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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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