Which ipv6 address command configures 2001:0db8:0000:0000:0700:0003:400F:572B on serial0/0 using compressed notation?
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Correct answer: ipv6 address 2001:db8::700:3:400F:572B.
Why this is the answer
The correct answer, ipv6 address 2001:db8::700:3:400F:572B, correctly compresses the given IPv6 address. In IPv6, leading zeros in a 16-bit hexadecimal segment can be omitted (e.g., 0db8 becomes db8, 0700 becomes 700, 0003 becomes 3). A double colon (::) can replace a single contiguous string of one or more 16-bit all-zero segments. Here, 0000:0000 is replaced by ::. The second option, 2001:db8:0::700:3:4F:572B, incorrectly compresses 400F to 4F (only leading zeros can be omitted, not trailing or internal zeros) and uses 0 instead of :: for the first zero segment, then uses :: for the second. The third option, 2001::db8:0000::700:3:400F:572B, incorrectly uses two double colons, which is not allowed. The fourth option, 2001:0db8::7:3:4F:572B, incorrectly compresses 700 to 7 and 400F to 4F.
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