フリー問題

問題文

An engineer works through the keyed digest option of a routing header and the text that the verifier covers. Which statement is correct?

選択肢

1. The type value that the specification assigns to that option is five, the field of the routing header that contributes a lone octet to the covered text alongside the flags is Segments Left, and the count of leading octets that the address of the sender contributes to that text is twelve.
2. The type value that the specification assigns to that option is eleven, the field of the routing header that contributes a lone octet to the covered text alongside the flags is Last Entry, and the count of leading octets that the address of the sender contributes to that text is twelve.
3. The type value that the specification assigns to that option is five, the field of the routing header that contributes a lone octet to the covered text alongside the flags is Last Entry, and the count of leading octets that the address of the sender contributes to that text is sixteen.
4. The type value that the specification assigns to that option is eleven, the field of the routing header that contributes a lone octet to the covered text alongside the flags is Segments Left, and the count of leading octets that the address of the sender contributes to that text is sixteen.