フリー問題

問題文

Two waves of failures hit one site in the same week and an engineer has to tell them apart. Which statement names the likely cause behind a rash of failures on a network that uses a shared secret, and the sort of failure that a fallen authorization service brings about?

選択肢

1. The likely cause behind a rash of failures on a network that uses a shared secret is a quiet change, and the sort of failure that a fallen authorization service brings about is the address based one.
2. The likely cause behind a rash of failures on a network that uses a shared secret is a quiet change, and the sort of failure that a fallen authorization service brings about is the port based one.
3. The likely cause behind a rash of failures on a network that uses a shared secret is a quiet lapse, and the sort of failure that a fallen authorization service brings about is the address based one.
4. The likely cause behind a rash of failures on a network that uses a shared secret is a quiet lapse, and the sort of failure that a fallen authorization service brings about is the port based one.