Systems Security Certified Practitioner – SSCP – Question0829

Which of the following is an IP address that is private (i.e. reserved for internal networks, and not a valid address to use on the Internet)?

A. 192.168.42.5
B. 192.166.42.5
C. 192.175.42.5
D. 192.1.42.5

Correct Answer: A

Explanation:

This is a valid Class C reserved address. For Class C, the reserved addresses are 192.168.0.0 -192.168.255.255. The private IP address ranges are defined within RFC 1918:
RFC 1918 private ip address range

The following answers are incorrect:
192.166.42.5 Is incorrect because it is not a Class C reserved address.
192.175.42.5 Is incorrect because it is not a Class C reserved address.
192.1.42.5 Is incorrect because it is not a Class C reserved address.