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1

Shorten 2001:0db8:0000:0000:0000:ff00:0042:8329 correctly.

2001:db8::ff00:42:83292001:db8:0:0:0:ff00:42:83292001:db8::ff00::832921:db8::ff00:42:8329

2

Why can '::' appear only once in an address?

It looks cleanerTwo '::' would make the number of restored zero-groups ambiguousIPv6 forbids colonsIt saves memory

3

Expand ::1 to its full form.

0000:0000:0000:0000:0000:0000:0000:00011000:0000:0000:0000:0000:0000:0000:00000001:0000:0000:0000:0000:0000:0000:0000ffff::1

4

Which is a valid compression of 2001:0db8:0000:0000:0001:0000:0000:0001?

2001:db8::1:0:0:12001:db8::1::12001:db8:0:0:1::1both the first and third are valid but you'd normally pick the one hiding more zeros

IPv6 Compressor