Updated: 10/04/2017 by Computer Hope
Contents of an Ethernet frame
- The preamble (a seven byte identifying pattern that devices on the network use to detect incoming frames).
- A start frame delimiter, also known as an SFD (a one byte value marking the end of the preamble).
- Both the source and a destination MAC address.
- The EtherType field (a two byte value representing either the length of the frame or the specific protocol type).
- The payload, which contains the actual data being transmitted.
- The frame check sequence, also known as an FCS (a four byte redundancy check used to ensure the frame data was not corrupted during transfer).