A.root guard B.loop guard C.BPDU guard D.UDLD E.BPDU skew detection
A.a routing protocol that is flooding updates B.a flapping port that is generating BPDUs with the TCN bit set C.STP is not running on the switch D.a user that is downloading the output of the show-tech command E.a corrupted switch CAM table
A.ip verify unicast source reachable-via any B.ip verify unicast reverse-path C.ip verify unicast reverse-path loose D.ip verify unicast reverse-path strict