Which is the compressed format of the IPv6 address fe80:0000:0000:0000:0220:0b3f:f0e0:0029?

To compress the IPv6 address fe80:0000:0000:0000:0220:0b3f:f0e0:0029, we apply the standard rules for IPv6 address compression:

1. Omit leading zeros in each 16-bit block.
2. Replace one or more consecutive blocks of zeros with a double colon (::). This can be done only once in the address.

Using these rules, the compressed format of the IPv6 address is:

fe80::220:b3f:f0e0:29

Explanation of the options:

1. fe80::220:b3f:f0e0:29: Correct. This format correctly omits leading zeros and replaces the consecutive blocks of zeros with a double colon.
2. fe80:9ea0::2020:0:bf:e0:9290: Incorrect. This changes the structure and values of the original address.
3. fe80:9ea:0:2200::fe0:290: Incorrect. This does not accurately represent the original address’s values or structure.
4. fe80:9ea0::2020::bf:e0:9290: Incorrect and invalid. It has multiple uses of the double colon (::) and does not accurately reflect the original address’s values.

Thus, the first option, fe80::220:b3f:f0e0:29, is the correctly compressed format of the given IPv6 address.