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Difficulty: MediumPrivate IPv4 Addressing and RFC 1918

A network engineer is configuring an internal WLAN management interface on an enterprise wireless LAN controller. To comply with corporate security policy, the interface must be assigned an IPv4 address from the RFC 1918 private address space so that it is non-routable over the public Internet. Which of the following IPv4 addresses meets this requirement?

  1. A
    172.32.10.5
  2. B
    192.169.50.12
  3. 172.22.100.15Answer
  4. D
    11.20.30.40

Answer

172.22.100.15 is the only address within the RFC 1918 private IPv4 specification.
The IPv4 address 172.22.100.15 belongs to the 172.16.0.0/12 block (range 172.16.0.0 – 172.31.255.255), which is explicitly reserved by RFC 1918 for private internal networking.

Step-by-Step Solution

1
Recall the defined RFC 1918 private IPv4 address blocks.
Class A: 10.0.0.0 to 10.255.255.255 (10.0.0.0/8); Class B: 172.16.0.0 to 172.31.255.255 (172.16.0.0/12); Class C: 192.168.0.0 to 192.168.255.255 (192.168.0.0/16).
RFC 1918 sets aside specific address ranges for internal private enterprise networks.
2
Compare each option against the RFC 1918 range limits.
172.22.100.15 has a second octet of 22, which is between 16 and 31.
Any address in the 172.16.0.0/12 block is a valid private IPv4 address.

Key Concept

RFC 1918 Private IPv4 Address Ranges
Estimated Time:1m 0s
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Topics

Private IPv4 Addressing and RFC 1918

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