An engineer has typed four different single-line prefix lists in a word processor. The four
answers show the four different single-line prefix lists. The engineer then does a copy/paste
of the configuration into a router. Which of the lists could match a subnet whose prefix length
is 27?

A.
ip prefix-list fred permit 10.0.0.0/24 ge 16 le 28

B.
ip prefix-list barney permit 10.0.0.0/24 le 28

C.
ip prefix-list wilma permit 10.0.0.0/24 ge 25

D.
ip prefix-list betty permit 10.0.0.0/24 ge 28

Explanation:
Answer A is invalid–the ge value must be larger than /24 in this case, so the
command is rejecteD. Answer B implies a prefix length range from 24–28, inclusivE.
Answer C implies a range from 25–32 inclusive, because no le parameter exists to
limit the prefix length lower than the full length of an IPv4 subnet mask. The same
logic applies with answer D, but with a range from 28–32, so this final list could not
match prefix lengths of /27.