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Which Spanning-tree protocol mode creates a separate instance of STP for each VLAN?
CST
STP
PVST+
RSTP
PVST+ or Per-VLAN Spanning creates a separate instance of STP for each VLAN. This will allow different switches to be the root bridge of multiple VLANs in a common topology. For example, Switch 1 could be the root bridge of VLAN 10, and Switch 2 could be the root bridge of VLAN 20. (W. Odom, Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide, Chapter 2: Setting STP Mode)
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