Each station must examine received frames to determine if the station is a destination. If so, the framed is passed to a higher protocol layer for appropriate processing. IEEE 802.3 and Ethernet defines the First two layers of OSI Model and both are implemented by hardware. The information that is placed on the cable is made up of binary signals called bits. A packet is made up of groups of bits called bytes or octets.
Packet contains addressing, timing, protocol and error correction information as well as data.
The minimum packet size is 64bytes. The maximum packet size is 1518 bytes. The first three hexadecimal numbers identifies the manufacture of the Ethernet device and the manufacturer sequentially assigns the other three. They're three types of addressing when you sending a packet. When a specific Ethernet address is used as the destination address in a packet, that packet will be decoded only by the station with that specific address Multicast Addressing .