Quiz Entry - updated: 2026.07.14
What are the six common fields in a Data Link frame?
Frame Start/Stop, Addressing, Type, Control, Data, and Error Detection.
* The generic frame fields: header (start, addressing, type, control), the data payload, then the trailer (error detection, stop). *
| Field | Description |
|---|---|
| Frame Start and Stop | Identifies the beginning and end of the frame |
| Addressing | Indicates source and destination nodes (MAC addresses) |
| Type | Identifies the encapsulated Layer 3 protocol |
| Control | Identifies flow control services |
| Data | Contains the frame payload (the packet) |
| Error Detection | Used to determine transmission errors (e.g., CRC) |
Structure: Header contains Frame Start, Addressing, Type, and Control. Trailer contains Error Detection and Frame Stop.
Go deeper:
Ethernet 802.3 Frame Format / Structure (Electronics Notes) — field-by-field tour (preamble/SFD start, src/dest addressing, length/type, data, FCS) mapping onto the six generic fields.- The IEEE 802.3 Frame Format (Firewall.cx) — adds the 802.2 LLC (DSAP/SSAP, Control) view, making the "Control" field concrete.
- Ethernet frame (Wikipedia) — octet-length diagram of the fields.