单项选择题 Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet（）。

多项选择题 The network 172.25.0.0 has been divided into eight equal subnets. Which of the following IP addresses can be assigned to hosts in the third subnet if the ip subnet-zero command is configured on the router? （）

单项选择题 Why does RouterA show multiple unequal cost paths to network 192.168.81.0/24（）。