The Ethernet Frame Format
Ethernet breaks the data file into packages in a format that is different from the packets used in other networks: Ethernet breaks data down into frames. A frame is a package of information transmitted as a single unit.
An Ethernet frame can be between 64 and 1518 bytes long, but the Ethernet frame itself uses at least 18 bytes; therefore, the data in an Ethernet frame can be between 46 and 1500 bytes long. Every frame contains control information and follows the same basic organisation.
Ethernet networks include a variety of cabling and topology alternatives. Let us take time now to look at some of these alternatives based on their IEEE specification.