We know that there are two kinds of MAC frame format, one kind is DIX Ethernet II Ethernet frame, and is a kind of IEEE 802.3 MAC frame, today a book, the book mentioned, now due to commercial reasons, the OSI reference model to be being washed out gradually, gradually replaced the OSI model, TCP/IP reference model and are using Ethernet TCP/IP model II frame format, but the book again and said, now the gigabit Ethernet, Wan Zhao Ethernet, is using the 802.3 standard frame format, so may I ask you a great god, and the real life what we use what kind of frame format,,, her little brother, I'm not too will use wireshark, so it is unlikely to analysis what kind of frames,