200-901 Network Fundamentals Practice Question
Which of the following is a private IPv4 address range as defined by RFC 1918?
⚠ Common exam trap
Cisco often tests the exact boundaries of the 172.16.0.0/12 range, and the trap here is that candidates mistakenly think any address starting with 172 is private, but only 172.16.0.0 through 172.31.255.255 are reserved.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
172.16.0.0/12
RFC 1918 defines the private IPv4 address range 172.16.0.0/12, which includes addresses from 172.16.0.0 to 172.31.255.255. These addresses are reserved for use within private networks and are not routable on the public internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
192.167.0.0/16
Why it's wrong here
192.167.x.x is not private.
- ✓
172.16.0.0/12
Why this is correct
Correct. This is a private range.
- ✗
11.0.0.0/8
Why it's wrong here
11.0.0.0/8 is not private; the private 10.0.0.0/8 is.
- ✗
172.32.0.0/12
Why it's wrong here
172.32.x.x is not private; private range is 172.16.0.0/12.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 200-901 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-901 exam.