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Refer to the exhibit. Which STP mode is SW1 running?
Per-VLAN STP
IEEE 802.1W
Rapid PVST
IEEE 802.1D
In the second line of the output the line "spanning-tree enabled protocol rstp" can be seen. IEEE introduced RSTP as 802.1w. Common STP was introduced first as 802.1D. Per-VLAN STP (PVST+) and RPVST were introduced later by Cisco. For more information refer to: http://en.wikipedia.org/wiki/SpanningTreeProtocol#RapidSpanningTree_Protocol
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