Which is the compressed format of the IPv6 address fe80:09ea:0000:2200:0000:0000:0fe0:0290?

To compress the IPv6 address fe80:09ea:0000:2200:0000:0000:0fe0:0290, the following rules should be applied:

1. Leading zeros in each 16-bit block can be omitted.
2. One or more consecutive blocks of zeros can be replaced with a double colon (::), but this can only be done once in the address.

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

fe80:9ea:0:2200::fe0:290

Explanation of the options:

1. fe80:9ea:0:2200::fe0:290: Correct. It removes leading zeros and collapses the consecutive blocks of zeros into a double colon.
2. fe80:9:20::b000:290: Incorrect. This alters the original address’s structure and values.
3. fe80:9ea0::2020:0:bf:e0:9290: Incorrect. It changes the address’s structure and values, not accurately reflecting the original address.
4. fe80:9ea0::2020::bf:e0:9290: Incorrect and invalid. Multiple uses of the double colon (::) are not allowed in a single IPv6 address, and it also changes the original address values.