Which command enables RSTP on a switch?
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A. B. C. D.A
The correct command to enable RSTP (Rapid Spanning Tree Protocol) on a Cisco switch is option A: spanning-tree mode rapid-pvst.
Here's a detailed explanation of each option:
A. spanning-tree mode rapid-pvst - This command enables RSTP (Rapid Spanning Tree Protocol) with Per-VLAN Spanning Tree Plus (PVST+). RSTP is an improvement over the original Spanning Tree Protocol (STP) that provides faster convergence times in response to network changes. PVST+ is a Cisco proprietary implementation that allows for a separate instance of STP to be run for each VLAN on a switch.
B. spanning-tree uplinkfast - This command enables UplinkFast, a Cisco proprietary protocol that provides fast convergence for uplink failures. UplinkFast works by preselecting an alternate port to become the root port in the event of an uplink failure, reducing the time it takes for the network to converge.
C. spanning-tree backbonefast - This command enables BackboneFast, another Cisco proprietary protocol that provides fast convergence for backbone failures. BackboneFast works by precomputing a new root port for non-root switches in the event of a root port failure, reducing the time it takes for the network to converge.
D. spanning-tree mode mst - This command enables Multiple Spanning Tree (MST), a standard-based protocol that allows for multiple VLANs to be mapped to a single instance of STP. MST is useful for networks with a large number of VLANs, as it reduces the number of STP instances that need to be run.
In summary, the correct command to enable RSTP on a Cisco switch is spanning-tree mode rapid-pvst.