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| 8.8 |  | QoS using Low Speed Links |
| 8.8.2 |  | Link efficiency mechanisms |

A significant problem associated with low speed WAN links is the possibility of vital traffic becoming trapped behind streams of less important traffic. Link efficiency mechanisms can be used to give priority to one class of traffic over another. One such mechanism that can be used to reduce the latency for low volume traffic streams is weighted fair queuing. However, if the WAN bandwidth is very low, even being trapped behind a single large packet may introduce too much latency for delay sensitive voice traffic.