When the network traffic is heavy, if you do not want the downstream network to be congested or directly discard many packets due to the excessive data traffic sent upstream, you can limit and cache the traffic on the outbound interface of the upstream device, so that such packets can be blocked. The text is sent out at a relatively uniform speed.

When the network traffic is heavy, if you do not want the downstream network to be congested or directly discard many packets due to the excessive data traffic sent upstream, you can limit and cache the traffic on the outbound interface of the upstream device, so that such packets can be blocked. The text is sent out at a relatively uniform speed.

This technique can be:
A . GTS
B. Car
C. WRED
D. CBWFQ

Answer: A