IEEE 802.3 Ethernet Header and Trailer Fields

IEEE 802.3 Ethernet Header and Trailer Fields

1. Preamble

   • 7
     • Synchronization

2. Start Frame Delimiter (SFD)

   • 1
     • Signifies that the next byte begins the Destination MAC Address field

3. Destination MAC Address

   • 6
     • Identifies the intended recipient of this frame

4. Source MAC Address

   • 6
     • Identifies the sender of this frame

5. Type

   • 2
     • Defines the type of protocol listed inside the frame
       • IPv4
       • IPv6

6. Data and Pad

   • 46 - 1500
     • Holds data from a higher layer, typically an L3PDU

7. Frame Check Sequence (FCS)

   • 4
     • Provides a method for the receiving NIC to determine whether the frame experienced transmission errors