A.Listening B.Backup C.Learning D.Alternate
A.Forwarding B.Learning C.Listening D.Blocking
A.發(fā)送并接收BPDU,僅當收到自己發(fā)出的BPDU報文后,才會將端口disable掉 B.不發(fā)送但監(jiān)聽BPDU,不論收到誰發(fā)出的BPDU,都會將接口disable掉 C.發(fā)送并接收BPDU,不論收到誰發(fā)出的BPDU,都會將接口disable掉