Read the slash.
CIDR (Classless Inter-Domain Routing) writes a range as
<network>/<bits-fixed>. The smaller the number after /, the BIGGER the
range.
10.0.0.0/8 ~16.7M addresses (whole "10.x.x.x" net)
10.0.0.0/16 ~65k addresses
10.0.0.0/24 256 addresses
10.0.0.0/32 exactly 1 address
How many usable IP addresses does a 10.0.0.0/30 subnet typically have
in AWS / general practice (network + broadcast addresses excluded)?
A) 0 B) 2 C) 4 D) 30
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