单项选择题 What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table（）。

多项选择题 Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? （）

单项选择题 Arouterreceivesinformationaboutnetwork192.168.10.0/24frommultiplesources.Whatwilltherouterconsiderthemostreliableinformationaboutthepathtothatnetwork？（）