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Which statements are true regarding RSTP? (Choose three.)
RSTP allows a separate instance for each VLAN.
The port roles of RSTP are Blocking, Learning and Forwarding.
RSTP redefines the STP port roles by including alternate and backup roles.
RSTP supplies fast transition times to the forwarding state for point-to-point connections.
RSTP uses STP delay timers for re-convergence on point-to-point links.
RSTP speeds up the re-convergence of the spanning tree when topology changes in a layer 2 network.
The original STP (802.1D) was expanded and enhanced by IEEE and converted into Rapid Spanning Tree Protocol (802.1w). Cisco improved the original 802.1D IEEE specification and made a new proprietary standard, PVST+, which later expanded into Rapid PVST+. RSTP speeds up the recalculation of the STP in the layer 2 network topology changes. RSTP remains compatible to the original 802.1D but uses only three states, Discarding, Learning and Forwarding. However RSTP adds new port roles Alternate and Backup, which remain in discarding mode. To accomplish fast convergence on a port, the protocol relies on two new variables: edge ports and link type. For more information refer to: [http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html]
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