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CS Professional · Artificial Intelligence, Data Analytics and Cyber Security - Laws and Practice · Network Basics and Security

A firm's IT manager explains that its web portal must move from IPv4 to IPv6 support because available IPv4 addresses are nearly exhausted. Which statement about IPv4 and IPv6 is correct?

IPv4 uses 32-bit addresses while IPv6 uses 128-bit addresses. The much larger IPv6 space solves IPv4 address exhaustion. Reversing the sizes is wrong, and MAC addresses are separate 48-bit hardware identifiers, not IPv6 addresses.

  1. AIPv4 uses 128-bit addresses and IPv6 uses 32-bit addresses
  2. BIPv4 uses 32-bit addresses and IPv6 uses 128-bit addressesCorrect
  3. CBoth use 64-bit addresses but differ in port numbering
  4. DIPv6 uses 48-bit addresses identical to MAC addresses

Explanation

IPv4 addresses are 32 bits long, giving about 4.3 billion addresses, while IPv6 addresses are 128 bits long, giving a vastly larger space. The first option reverses the sizes, and MAC addresses are 48-bit hardware identifiers distinct from IPv6 addresses.

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