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IPv6 addresses are ______ bits long, compared to IPv4 addresses, which are _____ bits long.
Question

IPv6 addresses are ______ bits long, compared to IPv4 addresses, which are _____ bits long.

A.

128; 64

B.

64; 32

C.

64; 16

D.

128; 32

E.

None of the above

Correct option is D


• IPv4:
– Uses 32-bit addressing
– Written in dotted decimal notation (e.g., 192.168.1.1)
– Provides approximately 4.3 billion unique addresses, which is not enough due to massive growth of internet-connected devices
• IPv6:
– Uses 128-bit addressing
– Written in hexadecimal format separated by colons (e.g., 2001:0db8:85a3:0000:0000:8a2e:0370:7334)
– Supports 3.4 × 10³⁸ unique addresses, solving the IPv4 exhaustion issue
– Better features: auto-configuration, built-in IPsec, improved multicast and routing efficiency
• Therefore:
– IPv6 = 128 bits
– IPv4 = 32 bits
Correct choice: (d)

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