CCNA: Cisco Certified Network Associate — Question 475

Which two IP addressing schemes provide internet access to users on the network while preserving the public IPv4 address space? (Choose two.)

Answer options

• A. IPv6 addressing
• B. PAT with private internal addressing
• C. single public Class A network
• D. private networks only
• E. custom addresses from ARIN

Correct answer: A, B

Explanation

Answer A, IPv6 addressing, is correct as it provides a vastly larger address space than IPv4, allowing for more devices to connect to the internet without using public IPv4 addresses. Answer B, PAT with private internal addressing, is also correct because it allows multiple devices on a private network to share a single public IP address, preserving the limited IPv4 address space. The other options do not effectively address the conservation of public IPv4 addresses.