問題文
A port is given two strict-high priority queues, one for each of two voice services. The first commit is turned down. Once that has been put right, the operator measures that traffic in one of those queues above a certain rate is not getting the treatment the service was meant to have. Which statement covers both of those observations?
選択肢
- The commit wanted a scheduler-map that named both of the queues, and once one was written the traffic above the transmit rate of a strict-high queue is discarded rather than demoted, so the stream the operator measured had already been cut.
- Two or more strict-high queues on one port each have to carry a transmit rate, and on such a queue that rate is the ceiling of what the device treats as strict-high, with the traffic above it sharing leftover bandwidth.
- Both of the queues wanted a buffer-size, and on a strict-high queue the transmit rate is a minimum and nothing more, so traffic above it keeps its strict-high treatment as long as the port has room for it.
- One port takes one strict-high queue at most, which is why the first commit was turned down, and the traffic above the transmit rate of the queue that survived is held back to that rate and buffered instead of being sent, which is what the second measurement shows.