When you migrate a network from PVST+ to rapid-PVST+, which two features become inactive?
(Choose two.)
A.
Root guard
B.
Loop guard
C.
UplinkFast
D.
UDLD
E.
BackboneFast
F.
Bridge Assurance
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“You can see in the show spanning-tree summary command output that UplinkFast and BackboneFast are enabled, but are inactive in rapid-PVST mode. It is optional to remove both the commands. It does not affect any of the rapid-PVST operation if you do not remove the commands….Spanning Tree UplinkFast and BackboneFast features are PVST+ features. These are disabled when you enable rapid-PVST+ because those features are built within rapid-PVST+.”
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/72836-rapidpvst-mig-config.html#diagram1
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