CCNA Routing and Switching (legacy) — Question 118

For which two reasons was RFC 1918 address space defining (Choose two.)

Answer options

• A. to preserve public IPv4 address space
• B. to reduce the occurrence of overlapping IP addresses
• C. to preserve public IPv6 address space
• D. reduce the size of ISP routing tables
• E. to support the NAT protocol

Correct answer: A, B

Explanation

The correct answers, A and B, highlight the intent of RFC 1918 to conserve the limited public IPv4 addresses and to avoid issues that arise from overlapping IP addresses in private networks. Options C and E are incorrect as they pertain to IPv6 and NAT support, respectively, while D focuses on ISP routing tables, which is not a primary goal of defining private address spaces.