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Question

Difficulty: EasyIPv4 Addressing and Subnetting

A network technician is auditing host IP configurations across an enterprise network. Which of the following IPv4 addresses belong to RFC 1918 private address space? (Select TWO.)

  1. 10.50.100.1Answer
  2. 172.20.15.5Answer
  3. C
    172.32.10.1
  4. D
    192.169.1.10

Answer

The addresses 10.50.100.1 and 172.20.15.5 are private IPv4 addresses designated by RFC 1918.
The addresses 10.50.100.1 and 172.20.15.5 are correct because they reside inside RFC 1918 private IPv4 spaces: 10.0.0.0/8 (10.0.0.0 to 10.255.255.255) and 172.16.0.0/12 (172.16.0.0 to 172.31.255.255), respectively.

Step-by-Step Solution

1
Recall the defined RFC 1918 private IPv4 address blocks
The three RFC 1918 private blocks are: 10.0.0.0/810.0.0.0/8 (10.0.0.010.0.0.0 – 10.255.255.25510.255.255.255), 172.16.0.0/12172.16.0.0/12 (172.16.0.0172.16.0.0 – 172.31.255.255172.31.255.255), and 192.168.0.0/16192.168.0.0/16 (192.168.0.0192.168.0.0 – 192.168.255.255192.168.255.255).
RFC 1918 reserves these specific ranges for unrouted, internal IP addressing.
2
Evaluate each choice against the reserved ranges
The address 10.50.100.110.50.100.1 falls inside 10.0.0.0/810.0.0.0/8 and 172.20.15.5172.20.15.5 falls inside 172.16.0.0/12172.16.0.0/12. However, 172.32.10.1172.32.10.1 exceeds the upper limit of 172.31.255.255172.31.255.255, and 192.169.1.10192.169.1.10 falls outside 192.168.0.0/16192.168.0.0/16.
Addresses outside the three designated blocks are globally routable public addresses.

Key Concept

RFC 1918 Private IPv4 Address Allocation
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Topics

IPv4 Addressing and Subnetting

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