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Question:
The IPv4 address 127.0.0.1 is reserved as the loopback address, and IPv6 has the similar reservation. IPv6 addresses 0:0:0:0:0:0:0:0 and 0:0:0:0:0:0:0:1 are reserved as the loopback addresses. The address 0:0:0:0:0:0:0:1 can be described applying the :: notation with the 0s removed, resulting in ::1.
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