フリー問題

問題文

A team hardens the single hop form of the liveness protocol between two directly attached routers. Which statement is correct?

選択肢

1. That form sends and receives with the hop count set to its negotiated value, the check together with authentication gives a low overhead way of discarding a class of fragmented packets, and the use or the omission of the check leaves interoperability untouched.
2. That form sends and receives with the hop count set to its negotiated value, the check together with authentication gives a low overhead way of discarding a class of unauthorized packets, and the use or the omission of the check leaves reachability untouched.
3. That form sends and receives with the hop count set to its maximum value, the check together with authentication gives a low overhead way of discarding a class of fragmented packets, and the use or the omission of the check leaves reachability untouched.
4. That form sends and receives with the hop count set to its maximum value, the check together with authentication gives a low overhead way of discarding a class of unauthorized packets, and the use or the omission of the check leaves interoperability untouched.