A.75s

B.60s

C.20s

D.90s

A.OSPF

B.IS-IS

C.BGP

D.ICMP

A.FALSE

B.TRUE

A.After TC-BPDU attack defense function is enabled, you can set the number of times the switch processes TC BPDUs within a certain period

B.When the designated port enabled with root protection receives optimal RST BPDUs, the port enters the Discarding state and does not forward packets. If the port does not receive optimal RST BPDUs within a certain period of time, the port will automatically restore to the Forwarding state

C.If the edge port on the switch enabled with BPDU protection receives RST BPDU, the switch sets the edge port as a non-edge-port and triggers STP calculation

D.The role of the designated port that is enabled with root protection cannot be changed

A.Random access

B.AC1

C.None

D.AC2