|  | 6.4 | Framing
| 6.4.8 | Data fields
The reason for sending frames is to get higher-layer data, ultimately the user application data, from the source computer to the destination computer. The data package you want to deliver has two parts. First, the message you want to send and second, the encapsulated bytes that you want to arrive at the destination computer. Included along with this data, you must also send a few other bytes. They are called padding bytes, and are sometimes added so that the frames have a minimum length for timing purposes. LLC bytes are also included with the data field in the IEEE standard frames. Remember that the Logical Link Control (LLC) sub-layer takes the network protocol data, an IP packet, and adds control information to help deliver that IP packet to its destination. Layer 2 communicates with the upper-level layers through Logical Link Control (LLC).