What is a Segment?
As with many terms and acronyms, segment has multiple meanings.
The dictionary definition of the term is as follows:
• A separate piece of something
• One of the parts into which an entity, or quantity is divided or marked
off as if by natural boundaries
In the context of data communication, the following definitions are used:
• Section of a network that is bounded by bridges, routers, or switches.
• In a LAN using a bus topology, a segment is a continuous electrical
circuit that is often connected to other such segments with repeaters.
• Term used in the TCP specification to describe a single transport
layer unit of information – the Layer 4 Protocol Data Unit (PDU)