|  | 6.1 | LAN Standards
| 6.1.6 | LLC as one of four concepts of Layer 2

Layer 2 has four main concepts that you must learn:

1. Layer 2 communicates with the upper-level layers through Logical Link Control (LLC).
2. Layer 2 uses a flat addressing convention (Naming refers to the assignment of unique identifiers - addresses).
3. Layer 2 uses framing to organize or group the data.
4. Layer 2 uses Media Access Control (MAC) to choose which computer will

transmit binary data, from a group in which all computers are trying to transmit at the same time.