单项选择题
A.when a packet is received from an 802.1Q trunk，the vlan id can be determined from the source MAC address table
B.unkown unicast frames are retransmitted only to the ports that belong to the same vlan
C.ports between switches should be configured in access mode so that vlans can span across the ports
D.broadcast and multicast frames are retransmitted to ports that are configured on different vlan
单项选择题 For the network 192.0.2.0/23, which option is a valid IP address that can be assigned to a host?（）
单项选择题 The ip subnet zero command is not configured on a router. What would be the IP address of Ethernet0/0 using the first available address from the sixth subnet of the network 192.168.8.0/29? （）
单项选择题 Refer to the exhibit.Which statement describes DLCI 17？（）