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The unspecified address has a value of 0:0:0:0:0:0:0:0 and is therefore also called the all-zeros address. It is comparable to 0.0.0.0 in IPv4. It indicates the absence of a valid address, and it can, for example, be used as a Source address by a host during the boot process when it sends out a request for address configuration information. If you apply the notation conventions discussed earlier in this chapter, the unspecified address can also be abbreviated as :: . It should never be statically or dynamically assigned to an interface, and it should not appear as a Destination IP address or within an IPv6 Routing header. It is sometimes used in configuration files for software to tell a program to use any IPv6 address configured on an interface.
IPv6 Essentials, Third Edition, by Silvia Hagen
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Cuidado com o comentário do @Paulo Sizinho. Está completamente errado.
O endereço IPv6 "::" equivale ao endereço IPv4 0.0.0.0 e não ao endereço de loopback como o Paulo afirmou. No caso de loopback os endereços corretos são: 127.0.0.1(ipv4) e ::1(ipv6).
Assim como a questão solicita, o endereço NULO (ipv4 = 0.0.0.0.0 e ipv6 = ::) serve, no caso do asterisk e em outros softwares também, para indicar que a interface poderá receber conexões de todo mundo.
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Gabarito E
Endereço nulo IPV4 = 0.0.0.0.0
Endereço nulo IPV6 = ::
"Retroceder Nunca Render-se Jamais !"
Força e Fé !
Fortuna Audaces Sequitur !