Refer to the exhibit. Users on a LAN connected to R2 frequently open high-traffic connections with a server connected to R1. During heavy usage periods, the link between R1 and R2 becomes congested…

FIFO (First-In, First-Out) is the default queuing mechanism and does not offer prioritization or active congestion management, thus it will not inherently improve performance on an already congested link.

Traffic shaping primarily delays packets to smooth out bursts and regulate the transmission rate, but on a consistently congested link, it might introduce additional delay without solving the underlying issue of insufficient bandwidth or prioritization.

Implementing traffic policing allows the network to drop traffic that exceeds a defined rate, thereby mitigating congestion from unnecessary high-volume flows. Combined with CBWFQ, essential traffic can be guaranteed bandwidth and prioritized, improving overall link performance during heavy usage while ensuring that traffic continues to flow under controlled conditions.

Low Latency Queuing (LLQ) with a strict policy prioritizes critical, delay-sensitive traffic. Applying it to 'all traffic from the server' indiscriminately for high-traffic connections could starve other necessary traffic, which is not optimal for general performance improvement.