Question

A network engineer applies a QoS policy to a WAN sub-interface and needs to verify how the traffic is being conditioned. The running configuration shows: policy-map WAN-OUT / class class-default / shape average 20000000 / service-policy CHILD-QOS. During peak hours, users report that non-priority traffic bursts are being delayed rather than dropped when the link approaches its subscribed rate. Based on this configuration, what behavior is the parent policy producing?

Accepted Answer

It buffers excess traffic exceeding 20 Mbps and delays it, smoothing the output to the configured average rate before applying the child policy.

Answer

It immediately drops all traffic exceeding 20 Mbps, marking down conforming packets according to the child policy.

Answer

It re-marks traffic above 20 Mbps to a lower DSCP value while forwarding it without buffering.

Answer

It reserves 20 Mbps of guaranteed bandwidth for priority traffic and polices everything else to the remainder.