| Explanation & Hint:
To compress the IPv6 address 2002:0420:00c4:1008:0025:0190:0000:0990, we need to apply the standard rules for IPv6 address compression:
- Omit leading zeros in each 16-bit block.
- Replace one or more consecutive blocks of zeros with a double colon (::), but only once in an address.
Applying these rules, the compressed format of the IPv6 address is:
2002:420:c4:1008:25:190:0:990
Explanation of the options:
- 2002:420:c4:1008:25:190::990: Almost correct, but it misses a ‘0’ in the last block before ‘990’. It should be
0:990, not ::990.
- 2002:4200::25:1090:0:99: Incorrect. This changes the values in the original address and does not accurately represent the original blocks.
- 2002:42:10:c400::909: Incorrect. This does not match the original address’s structure or values.
- 2002:42::25:1090:0:99: Incorrect. This also changes the values in the original address and does not accurately represent the original blocks.
Thus, the first option is the closest, but the correct compressed format is 2002:420:c4:1008:25:190:0:990. |