問題文
A team wants to know what has to happen before the controller raises the warning that somebody is putting out a radio dressed up as one of its own. What does the guide give as the thing that is read and as the point at which the warning goes up?
選択肢
- The hardware address that a radio announces itself under is read, a match against the addresses of the units of the site raises a count of failures, and the warning goes up once that count has passed its threshold.
- The element that the units put into their notices and into their answers is read, a wrong signature or a time that is out or the element being absent raises a count of failures, and the warning goes up once that count has passed its threshold.
- The strength at which a radio is heard is read, a reading that is far above what the map would give for that spot raises a count of failures, and the warning goes up once that count has passed its threshold.
- A mark that the units carry in what they announce and in what they answer a call with is read, and the warning goes up the moment a single reading of that mark comes back wrong, because a mark of that kind is never wrong for an honest unit.