Ethernet is frame based network technology.
See below a few definitions from RFC 1122:
SEGMENT
A segment is the unit of end-to-end transmission in the TCP protocol. A segment consists of a TCP header followed by application data. A segment is transmitted by encapsulation inside an IP datagram.
PACKET
A packet is the unit of data passed across the interface between the internet layer and the link layer. It includes an IP header and data. A packet may be a complete IP datagram or a fragment of an IP datagram.
FRAME
A frame is the unit of transmission in a link layer protocol, and consists of a link-layer header followed by a packet.
The following answers are incorrect:
Ethernet segment. Is incorrect because Ethernet segment is a distractor, TCP segment would be the correct terminology. Ethernet is a frame based network technology,
Ethernet datagram. Is incorrect because Ethernet datagram is a distractor, IP datagram would be the correct terminology. Ethernet is a frame based network technology
Ethernet packet. Is incorrect because Ethernet packet is a distractor, a Packet is a group of information so would not be a "single unit". Ethernet is a frame based network technology.
Look at the diagrams below that were extracted from my Security+ Computer Based Tutorial.
TCP/IP Data Structures
IMPORTANT NOTE:
The names used on the diagram above are from RFC 1122 which describe the DOD Model.
Vendors and Books may use slightly different names or even number of layers.
TCP/IP Data Structure
The following Reference(s) were used for this question:
Wikipedia http://en.wikipedia.org/wiki/Ethernet
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