SK0-003 · Question #54
Which of the following is a public IP address?
The correct answer is D. 172.15.16.76. The question asks to identify a public IP address from the given options by distinguishing it from reserved private IP address ranges.
Question
Which of the following is a public IP address?
Options
- A172.31.254.40
- B10.100.11.1
- C192.168.100.1
- D172.15.16.76
How the community answered
(43 responses)- B2% (1)
- C2% (1)
- D95% (41)
Why each option
The question asks to identify a public IP address from the given options by distinguishing it from reserved private IP address ranges.
172.31.254.40 is a private IP address because it falls within the RFC 1918 private range of 172.16.0.0 - 172.31.255.255.
10.100.11.1 is a private IP address because it falls within the RFC 1918 private range of 10.0.0.0 - 10.255.255.255.
192.168.100.1 is a private IP address because it falls within the RFC 1918 private range of 192.168.0.0 - 192.168.255.255.
172.15.16.76 is a public IP address because it does not fall within any of the reserved private IP address ranges defined by RFC 1918. Specifically, the private IP range for the 172.x.x.x block is 172.16.0.0 to 172.31.255.255, and 172.15 is outside this designated private block.
Concept tested: Public and private IP address ranges
Source: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-networks-faq#what-ip-address-ranges-can-i-use-in-my-private-networks
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