問題文
A reviewer must describe the division of labor between the per-priority pause mechanism and the marking-based congestion signal in a converged Ethernet fabric. Which description is correct?
選択肢
- The pause mechanism travels end to end and reaches the original sender directly, which is why it is the faster of the two at reducing the injection rate, while the marking signal is a hop-by-hop mechanism that stops the upstream port until the local queue has drained below its threshold.
- The marking signal replaces the pause mechanism once the fabric is stable.
- Both mechanisms operate between adjacent devices, and the difference is only that one acts on the whole link while the other acts on a single class of traffic.
- The pause mechanism works between adjacent devices and holds back the previous hop so no frame is dropped, while the marking signal travels to the receiver, which then tells the original sender to slow down.