ITPEC IP April 2021 Question 31

The shortage of global IP addresses is resolved — IPv6 widens the address from 32 bits to 128 bits.

An IPv4 address is 32 bits, so there are only 2³², about 4.3 billion, addresses, and the global addresses reachable from the Internet ran out. An IPv6 address is 128 bits, giving 2¹²⁸ addresses, enough for every device to have its own global address.

Answer (b)

Why not others:

• •(a) — a duplicated address causes trouble in IPv6 as in IPv4; every address must still be unique
• •(c) — optical fibre is the physical line, usable with either IP version
• •(d) — the IP version does not set the line speed, so changing it does not by itself make communication faster

Key rule: The main reason for IPv6 is its huge address space; it does not change the physical line or the speed.

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