フリー問題

問題文

A frame recorded on the wire names a physical address, and an analyst wants the maker of the interface that sent it. How far does the guidance let that reading be taken?

選択肢

1. The leading three bytes name the maker of the interface, so the reading is a proof of origin, and the value is fixed in the hardware for the life of the card.
2. The trailing three bytes name the maker of the interface, so the reading is a lead rather than a proof, and software that is openly available can set the value to another.
3. The trailing three bytes name the maker of the interface, so the reading is a proof of origin, and the value is fixed in the hardware for the life of the card.
4. The leading three bytes name the maker of the interface, so the reading is a lead rather than a proof, and software that is openly available can set the value to another.