Which two statements describe differences between IPv4 and IPv6? (Choose two)
A . IPsec is built into IPv6
B . IPv6 uses a 32-bit (4-byte) address and can support up to 4,294,967,296 addresses
C . IPv4 supports extension headers whereas IPv6 options are integrated into the base
D . IPv6 eliminates the need for NAT
Answer: A,D