Which statement about vlan operation on cisco catalyst switches is true?（） [" when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table."," unkown unicast frames are retransmitted only to the ports that belong to the same vlan"," ports between switches should be configured in access mode so that vlans can span across the ports"," broadcast and multicast frames are retransmitted to ports that are configured on different vlan."]
安塔拉是一个？（） ["黄种人","黑人","混血儿","白种人"]
奥斯卡奖设立于（）。 ["1927年","1928年","1929年","1941年"]
如何根据大脑皮层活动规律安排幼儿园一日活动。
歼击机的主要用途是什么？有什么特点？
深度线索
