Which statement describes a benefit of IPv6 over IPv4?

Which statement describes a benefit of IPv6 over IPv4?

• A. IPv6 provides 128-bit addresses, vastly more addresses and improved routing.
• B. IPv6 uses shorter addresses than IPv4.
• C. IPv6 has weaker routing than IPv4.
• D. IPv6 eliminates the need for IP headers.

Answer: (A)

The main advantage is the 128-bit address space, which provides vastly more addresses and enables scalable routing. With 2^128 possible addresses, there is enough space for every device now and in the future, reducing the need for workarounds like NAT and supporting larger, more diverse networks. This huge space also supports better routing efficiency because addresses can be allocated hierarchically, allowing routers to summarize large blocks of addresses and keep routing tables smaller. The idea that addresses are shorter is incorrect—IPv6 addresses are longer than IPv4. It also doesn’t eliminate IP headers; IPv6 still uses a header-based model, though the header is streamlined for efficiency.

The main advantage is the 128-bit address space, which provides vastly more addresses and enables scalable routing. With 2^128 possible addresses, there is enough space for every device now and in the future, reducing the need for workarounds like NAT and supporting larger, more diverse networks. This huge space also supports better routing efficiency because addresses can be allocated hierarchically, allowing routers to summarize large blocks of addresses and keep routing tables smaller. The idea that addresses are shorter is incorrect—IPv6 addresses are longer than IPv4. It also doesn’t eliminate IP headers; IPv6 still uses a header-based model, though the header is streamlined for efficiency.