CCNA Plan

CCNA practice question: Network Fundamentals

Network FundamentalsDifficulty 2/5

Which address is in a private range defined by RFC 1918?

  1. A172.33.10.1
  2. B192.169.5.5
  3. C10.255.254.1
  4. D169.254.10.10
Show answer and rationale

Correct: C. RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12 (172.16–172.31) and 192.168.0.0/16. 10.255.254.1 is inside 10.0.0.0/8.

  • A — 172.33 is outside 172.16.0.0–172.31.255.255.
  • B — 192.169.0.0 is outside 192.168.0.0/16.
  • D — 169.254.0.0/16 is link-local (APIPA), not RFC 1918.

Concept being tested

Network components, topologies, cabling and interface issues, TCP vs UDP, IPv4 addressing and subnetting, IPv6 addressing and types, wireless principles, virtualization, switching concepts. — 20% of the exam. Study guide for Network Fundamentals.

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Primary references

  1. CCNA Exam v1.1 (200-301) Exam Topics — Cisco Systems · primary · retrieved 2026-09-21, verified 2026-09-21
  2. RFC 1918 — Address Allocation for Private Internets — IETF · government · retrieved 2026-09-21, verified 2026-09-21
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