Cisco Certified Network Associate (CCNA) Practice Exam

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What command is used to enable Rapid Spanning Tree Protocol in a Cisco switch?

spanning-tree mode standard
spanning-tree mode rapid-pvst
enable rapid-stp
spanning-tree mode pvst

The correct answer is: spanning-tree mode rapid-pvst

The command used to enable Rapid Spanning Tree Protocol (RSTP) on a Cisco switch is "spanning-tree mode rapid-pvst." This command configures the switch to operate using the Rapid Per-VLAN Spanning Tree (Rapid-PVST) mode, which is an enhancement of the traditional Spanning Tree Protocol (STP). Rapid-PVST provides faster convergence times than standard STP and allows for the creation of a separate spanning tree instance for each VLAN. This is particularly useful in VLAN environments where rapid recovery from network topology changes is necessary to minimize downtime and improve overall network stability. In contrast, enabling standard STP or other modes, such as PVST, does not provide the enhanced features of rapid convergence and can lead to longer recovery times in the event of a topology change. The correct command helps to optimize the network and ensure it is running as efficiently as possible.