Which statement about IP addresses and IPv4 vs IPv6 is accurate?

Which statement about IP addresses and IPv4 vs IPv6 is accurate?

• A. An IP address identifies a device on a network; IPv6 uses 64-bit addresses and IPv4 uses 128-bit addresses.
• B. An IP address identifies a device on a network; IPv4 uses 64-bit addresses, IPv6 uses 128-bit addresses.
• C. An IP address identifies a device on a network; IPv4 uses 32-bit addresses, IPv6 uses 128-bit addresses.
• D. An IP address identifies a device on a network; IPv4 uses 16-bit addresses, IPv6 uses 128-bit addresses.

Answer: (C)

An IP address identifies a device on a network, enabling data to be routed to the right machine. The version determines how many unique addresses are available. IPv4 uses 32-bit addresses, which gives about 4.3 billion possible addresses; IPv6 uses 128-bit addresses, vastly expanding the address space. The common representations differ too: IPv4 addresses are written in dotted decimal (four numbers 0-255), while IPv6 uses eight groups of four hex digits separated by colons. The other statements mix up the bit lengths (IPv4 isn’t 64-bit or 16-bit, and IPv6 isn’t defined as 64-bit), so the description with 32-bit for IPv4 and 128-bit for IPv6 is the accurate one.

An IP address identifies a device on a network, enabling data to be routed to the right machine. The version determines how many unique addresses are available. IPv4 uses 32-bit addresses, which gives about 4.3 billion possible addresses; IPv6 uses 128-bit addresses, vastly expanding the address space. The common representations differ too: IPv4 addresses are written in dotted decimal (four numbers 0-255), while IPv6 uses eight groups of four hex digits separated by colons. The other statements mix up the bit lengths (IPv4 isn’t 64-bit or 16-bit, and IPv6 isn’t defined as 64-bit), so the description with 32-bit for IPv4 and 128-bit for IPv6 is the accurate one.