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CERTIFIED-IN-CYBERSECURITY · Question #180

Which of the following is a valid public IP?

The correct answer is D. 12.123.23.23. IPv4 addresses consist of four octets, each ranging from 0 to 255. Option A (256.231.342.123) is invalid because 256 and 342 exceed the maximum value of 255. Option B (172.213.123.321) is invalid because 321 exceeds 255. Option C (192.168.123.123) uses valid octet values but…

Network Security Concepts

Question

Which of the following is a valid public IP?

Options

  • A256.231.342.123
  • B172.213.123.321
  • C192.168.123.123
  • D12.123.23.23

How the community answered

(37 responses)
  • A
    5% (2)
  • B
    3% (1)
  • C
    3% (1)
  • D
    89% (33)

Explanation

IPv4 addresses consist of four octets, each ranging from 0 to 255. Option A (256.231.342.123) is invalid because 256 and 342 exceed the maximum value of 255. Option B (172.213.123.321) is invalid because 321 exceeds 255. Option C (192.168.123.123) uses valid octet values but falls within the 192.168.0.0/16 private IP range, making it non-routable on the public internet. Option D (12.123.23.23) has all octets within the valid 0–255 range and does not fall within any reserved private range (10.x.x.x, 172.16–31.x.x, or 192.168.x.x), making it the only valid public IP.

Topics

#IP Addressing#IPv4#Public IP#Private IP

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