Distribution layer: This layer includes LAN-based routers and layer 3 switches . When is a first-hop redundancy protocol needed in the distribution layer?()
A. OSPF is not supported by the design
B. HSRP is not supported by the design
C. preempt tuning of the default gateway is needed
D. the design implements Layer 3 between the access switch and the distribution switch
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Excel可以为重要的工作簿设置保护,限制进行相应的操作。
A. 正确
B. 错误
如果允许融资融券,将有利于投资者利用衍生工具的交易进行避险和套利,提高市场效率,使得投资者进行买入期货卖出现货的买进套利成为可能。( )
A. 正确
B. 错误