Which parameter or parameters are used to calculate OSPF cost in cisco routers?（）

You are working in a data center environment and are assigned the address range 10.188.31.0 23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?（）

A.10.188.31.0/27
B.10.188.31.0/26
C.10.188.31.0/29
D.10.188.31.0/28
E.10.188.31.0/25

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Which IPv6 address is the equivalent of the IPv4 interface loopback address 127.0.0.1?（）

A.::1
B.::
C.2000::/3
D.0::/10

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