What does a double colon (::) represent in an IPv6 address notation?
- a continuous string of one or more hextets that contain only zeros
- at least eight occurrences of the same non-zero value
- the boundary between the network portion and the host portion of the address
- the beginning of the MAC address assigned to the IPv6 device
Explanation: To help reduce the notation of IPv6 addresses a double colon (::) can replace any single, contiguous string of one or more hextets consisting of all zeros. Only one instance of the double colon can be used in any IPv6 notation.
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