When congestion occurs, queuing strategies can be varied. If you need to get services for the first arriving packets, you can use the () queuing strategy; if you want to ensure that the most urgent and critical business is served first, you can use the () queuing strategy: if you need to balance the delay and delay jitter of each flow, you can choose () queuing strategy; if you want to provide professional bandwidth for specific services, you can choose () queuing strategy.