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Difficulty: EasyPrivate IPv4 Addressing and RFC 1918

A network administrator is allocating IPv4 addresses for internal workstations on an enterprise LAN. Which of the following IPv4 addresses are reserved for private network use under RFC 1918? (Select TWO.)

  1. 10.200.15.1Answer
  2. 172.28.45.10Answer
  3. C
    172.35.10.50
  4. D
    192.170.10.1

Answer

The addresses 10.200.15.1 and 172.28.45.10 are reserved private IPv4 addresses under RFC 1918.
The IPv4 address 10.200.15.1 belongs to the 10.0.0.0/8 private address block, and 172.28.45.10 belongs to the 172.16.0.0/12 private address block (which ranges from 172.16.0.0 to 172.31.255.255). Both are valid RFC 1918 private IPv4 addresses.

Step-by-Step Solution

1
Identify the three RFC 1918 private address ranges
Class A: 10.0.0.0/8 (10.0.0.0 - 10.255.255.255), Class B: 172.16.0.0/12 (172.16.0.0 - 172.31.255.255), Class C: 192.168.0.0/16 (192.168.0.0 - 192.168.255.255).
RFC 1918 explicitly defines these three address blocks for private, unroutable network use.
2
Evaluate each candidate address against the RFC 1918 blocks
10.200.15.1 is inside 10.0.0.0/8. 172.28.45.10 is inside 172.16.0.0/12. 172.35.10.50 is outside 172.16.0.0/12 (35 > 31). 192.170.10.1 is outside 192.168.0.0/16 (170 != 168).
Comparing second octets ensures correct boundary verification for Class B and Class C private ranges.

Key Concept

RFC 1918 Private IPv4 Address Ranges
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Topics

Private IPv4 Addressing and RFC 1918

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