フリー問題

問題文

A talk between two devices stays quiet for a while because neither side has any label news to pass. Which statement about what resets the timer kept for a peer, about how the duty to be heard inside the agreed period can be discharged, and about the role of the bare heartbeat is correct?

選択肢

1. Where the soundness of a talk is watched, the timer kept for a peer resets on inbound units, the duty to be heard inside the agreed period can be met by other messages, and the bare heartbeat fills the quiet gap, as the specification lays out.
2. Where the soundness of a talk is watched, the timer kept for a peer resets on outgoing traffic, the duty to be heard inside the agreed period can be met by other messages, and the bare heartbeat hides the quiet gap, as the specification lays out.
3. Where the soundness of a talk is watched, the timer kept for a peer resets on outgoing traffic, the duty to be heard inside the agreed period can be met by silence instead, and the bare heartbeat fills the quiet gap, as the specification lays out.
4. Where the soundness of a talk is watched, the timer kept for a peer resets on inbound units, the duty to be heard inside the agreed period can be met by silence instead, and the bare heartbeat hides the quiet gap, as the specification lays out.