Is a sent message buffered somewhere until the receiving node acknowledges receiving it?
Yes. The transmitting link endpoint keeps each message it sends in its transmit queue until it receives acknowledgment from the receiving node that the message has been received (or until the link fails), at which point the message buffer is released. The number of messages that can be queued varies according to the importance of message; for example, once the queue becomes sufficiently large, low importance messages can no longer be sent but medium-to-critical importance messages still can.
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