While you are troubleshooting network performance issues， you notice that a switch is periodically flooding all unicast traffic. Further investigation reveals that periodically the switch is also having spikes in CPU utilization， causing the MAC address table to be flushed and relearned. What is the most likely cause of this issue？（） ["a routing protocol that is flooding updates","a flapping port that is generating BPDUs with the TCN bit set","STP is not running on the switch","a user that is downloading the output of the show-tech command","a corrupted switch CAM table"]
什么是设计的物化？
旅客周转量是指一定时期内，铁路局或全路所完成的旅客（）。 ["人公里数","公里","人数","吨公里数"]
当净现值率与净现值得出不同结论时，应以（）为准。 ["净现值","净现值率","内部报酬率","净现值率与内部报酬率之差"]
猪背部沿脊椎骨两侧之长条状的肉俗称（）。 ["颈部肉","腿肉","里脊肉","腹肉"]
模式识别
