Networking professionals need to have an idea of the fields within an Ethernet frame, as shown in the following screenshot:
The fields are as follows:
- Preamble: The Preamble is made up of seven bytes and the Start Frame Delimiter (SFD), which is one byte. This is generally used for synchronization between the sender and the receiver devices on a network.
- Source MAC Address: The source MAC address field is made up of six bytes in length which is used to store the sender's MAC address.
- Destination MAC Address: Similarly to the source MAC address field, the destination MAC address field is also six bytes and contains the destination MAC address of the next device along the path to the final destination.
- EtherType: The EtherType field is two bytes, and is used to help identify various protocols which are used by the layers above the Data Link Layer...
