单项选择题
Which type of cable is required to access the router’s console port from a PC？（）
A.modem B.Ethernet C.nullmodem D.straight-through
单项选择题 When using a 40 Gbps switch fabric,how much full duplex bandwidth is available to each slot?（）
单项选择题 Which configuration command builds a read-write SNMP community named operator?（）
单项选择题 The policy action of color is used for congestion control under which circumstance?（）
