单项选择题
A.A remote physical layer problem exists.
B.The host NIC is not functioning.
C.TCP/IP has not been correctly installed on the host.
D.A local physical layer problem exists.
单项选择题 Youareworkinginadatacenterenvironmentandareassignedtheaddressrange10.188.31.0/23.YouareaskedtodevelopanIPaddressingplantoallowthemaximumnumberofsubnetswithasmanyas30hostseach.WhichIPaddressrangemeetstheserequirements？（）
单项选择题 As a CCNA candidate，you must have a firm under standing of the IPv6 address structure.Refer to IPv6 address，could you tell me howm any bits are included in each filed？（）
多项选择题 Which statements describe two of the benefits of VLAN Trunking Protocol?（）