Cisco CCNA mock exam questions sample test – Question 2

Which is NOT a valid range for private IP addresses?

A. 10.0.0.0 – 10.255.255.255
B. 172.16.0.0 – 172.31.255.255
C. 192.168.0.0 – 192.168.255.255
D. 192.255.255.255-193.0.0.0

Correct Answer: D

Explanation:
The range 192.255.255.255 – 193.0.0.0 is a valid public IP address range, not a private IP address range.
The Internet Assigned Numbers Authority (IANA) has reserved the following three ranges for private Internet use:
10.0.0.0 – 10.255.255.255 (10.0.0.0/8)
172.16.0.0 – 172.31.255.255 (172.16.0.0/12)
192.168.0.0 – 192.168.255.255 (192.168.0.0/16)
The Internet Assigned Numbers Authority (IANA) manages and distributes global public IP addresses. IANA also performs DNS root zone management. IANA operates with the help of International Engineering Task Force (IETF) and RFC Editor to manage IP address allocation and DNS root zone management. There are Regional Internet Registries (RIRs) through which IANA allocates local registrations of IP addresses to different regions of the world. Each RIR handles a specific region of the world.

Objective:
Network Fundamentals

Sub-Objective:
Describe the need for private IPv4 addressing

References:
http://www.ietf.org/rfc/rfc1918.txt
http://www.iana.org/