SSCP: Systems Security Certified PractitionerDemo

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QuestionQ692

Network and Communications Security

Which of the following is not a valid notation for an IPv6 address?

  • A 2001:0db8:0:0:0:0:1428:57ab
  • B ABCD:EF01:2345:6789:ABCD:EF01:2345:6789
  • C ::1
  • D 2001:DB8::8:800::417A
Explanation

IPv6 zero compression (::) can appear only once in an address; otherwise, the number of omitted all-zero hextets is ambiguous. The notation 2001:DB8::8:800::417A uses :: twice and is therefore invalid.

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