| Explanation & Hint:
The compressed format of the IPv6 address 2001:0db8:0000:0000:0000:a0b0:0008:0001 can be derived by following the rules for IPv6 address compression. These rules allow for the omission of leading zeros in each 16-bit block and the replacement of one or more consecutive blocks of zeros with a double colon (::). However, the double colon can only be used once in an address to ensure its uniqueness.
Given these rules, the correct compressed format for this IPv6 address is:
2001:db8::a0b0:8:1
Explanation of the options:
- 2001:db8::a0b0:8:1: Correct. It omits leading zeros and replaces consecutive blocks of zeros with a double colon.
- 2001:db80:0:1::80:1: Incorrect. This changes the value of the original address (the second block is
db80 instead of db8) and misplaces zeros.
- 2001:db8::ab8:1:0:1000: Incorrect. This changes the value of the original address and does not correctly represent the zero blocks.
- 2001:db80:::1::80:1: Incorrect and invalid. Multiple uses of the double colon (::) are not allowed in a single IPv6 address, and it also changes the value of the original address.
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