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| 1. | Circuit emulation provides a seamless migration approach to backbone PSNs without interruption of legacy |
| 摘要电路仿真对于电信网向分组交换网的平稳过渡有着重要意义。 |
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| 2. | workgroup switches must support the STP to simplify network configuration and allow redundant links to the backbone |
| 在这种情况下，工作组交换机必须支持STP，以简化网络配置和允许接到基干交换机的冗余链路而无需将环路引入网络。 |
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