An engineer must design a solution to connect a customer to the Internet. The solution will include a Layer 3 circuit with a CIR of 50 Mbps from the service provider. The hand-off from the…

Simply reducing the bandwidth of the connection to the router is not a standard or effective QoS mechanism to manage traffic within a CIR and prevent drops.

A parent policing policy would drop excess traffic immediately when the CIR is reached, which is detrimental to real-time applications like voice traffic, causing choppiness and poor quality.

Implementing hierarchical QoS with a parent shaping policy on the customer's router outbound interface ensures that traffic never exceeds the 50 Mbps CIR provided by the service provider. Shaping buffers excess traffic and sends it at a controlled rate, preventing the service provider from dropping packets that exceed the CIR, which is crucial for sensitive traffic like voice.

Adding a bandwidth statement to the router interface primarily informs routing protocols about the link capacity for metric calculations but does not enforce a traffic rate or prevent exceeding the CIR.