Question 400
A provider intends to rate-limit one customer's guest Internet traffic. Observed: A broad policer reduces throughput for other tenants on the same interface. Which change-acceptance control is most relevant to preventing this exact failure?
Explanation
Correct Answer
The control is specific to the initial failure. It requires the result Only the target guest class is capped while unrelated tenants keep their service rate. and treats A broad policer reduces throughput for other tenants on the same interface. as a failure signal. The causal concern is the policer was attached to a shared filter term rather than the customer's scoped traffic.
Incorrect Answers
The proposed control is tied to the rewrite rule was bound to an interface with the wrong outbound direction, typically observed when downstream peers see markings unchanged while reverse traffic is altered unexpectedly. Here the target is the policer was attached to a shared filter term rather than the customer's scoped traffic; monitor only the target guest class is capped while unrelated tenants keep their service rate.
It is valid for another service scenario but checks the core no longer preserves premium treatment across label-switched paths. This case instead needs a gate for a broad policer reduces throughput for other tenants on the same interface and evidence that only the target guest class is capped while unrelated tenants keep their service rate.
This gate monitors a different failure, the 802.1p priority observed downstream no longer matches the agreed enterprise service class. It would not detect the current problem: A broad policer reduces throughput for other tenants on the same interface. The appropriate check requires only the target guest class is capped while unrelated tenants keep their service rate.