What is the proper abbreviation of the IPv6 loopback address?

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Multiple Choice

What is the proper abbreviation of the IPv6 loopback address?

IPv6 uses a loopback address to refer to the local host, and the proper abbreviated form is ::1. This short form expands to 0:0:0:0:0:0:0:1, using the double-colon to compress the long run of zeros. The compression can be used only once in an address, and the trailing 1 identifies the loopback. The other forms aren’t loopback addresses: :: is the unspecified address; ::0 is the all-zero address; the full uncompressed form would be 0:0:0:0:0:0:0:1, which is correct but not the abbreviated form asked for.

IPv6 uses a loopback address to refer to the local host, and the proper abbreviated form is ::1. This short form expands to 0:0:0:0:0:0:0:1, using the double-colon to compress the long run of zeros. The compression can be used only once in an address, and the trailing 1 identifies the loopback. The other forms aren’t loopback addresses: :: is the unspecified address; ::0 is the all-zero address; the full uncompressed form would be 0:0:0:0:0:0:0:1, which is correct but not the abbreviated form asked for.

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