CCNA: Cisco Certified Network Associate — Question 901

Which concern is addressed with the use of private IPv4 addressing?

Answer options

• A. Lack of routing protocol support for CIDR and VLSM
• B. Lack of security protocols at the network perimeter
• C. Lack of available TCP/UDP ports per IPv5 address
• D. Lack of available publicly routable unique IPv4 address

Correct answer: D

Explanation

The correct answer is D because private IPv4 addresses help mitigate the shortage of publicly routable IPv4 addresses by allowing organizations to use non-routable IP addresses internally. Options A, B, and C deal with different networking concerns that are not directly related to the availability of unique IPv4 addresses.