Which of the following are private IP networks?
(Choose all that apply)

(A) 172.31.100.0
(B) 164.16.2.0
(C) 192.166.255.0
(D) 192.168.1.0
(E) 11.11.11.0
(F) 172.24.0.0

A, D and F are the correct answers. The range of private IP Networks are:

Class A 10.0.0.0 – 10.255.255.255
Class B 172.16.0.0 – 172.31.255.255
Class C 192.168.0.0 – 192.168.255.255