GCFA · Question #75
Which of the following IP addresses are private addresses? Each correct answer represents a complete solution. Choose all that apply.
The correct answer is B. 192.168.15.2 D. 10.0.0.3. RFC 1918 defines three private IPv4 ranges - 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 - and only addresses falling within those ranges are private.
Question
Which of the following IP addresses are private addresses? Each correct answer represents a complete solution. Choose all that apply.
Options
- A19.3.22.17
- B192.168.15.2
- C192.166.54.32
- D10.0.0.3
How the community answered
(20 responses)- A20% (4)
- B75% (15)
- C5% (1)
Why each option
RFC 1918 defines three private IPv4 ranges - 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 - and only addresses falling within those ranges are private.
19.3.22.17 does not fall within any RFC 1918 private range (10.x.x.x, 172.16-31.x.x, or 192.168.x.x) and is a publicly routable IP address.
192.168.15.2 falls within the 192.168.0.0/16 range (192.168.0.0 - 192.168.255.255) defined by RFC 1918 as a private address block.
192.166.54.32 is not within the private 192.168.0.0/16 range - the RFC 1918 private block requires the second octet to be 168, not 166, making this a public address.
10.0.0.3 falls within the 10.0.0.0/8 range (10.0.0.0 - 10.255.255.255) defined by RFC 1918 as a private address block.
Concept tested: RFC 1918 private IPv4 address range identification
Source: https://tools.ietf.org/html/rfc1918
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