200-901 Network Fundamentals Practice Question
Which TWO of the following are valid private IPv4 address ranges? (Select two.)
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
✓
10.0.0.0/8
RFC 1918 defines 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
172.15.0.0/12
Why it's wrong here
Private range starts at 172.16.0.0.
- ✓
10.0.0.0/8
Why this is correct
Correct. 10.0.0.0/8 is private.
- ✗
172.32.0.0/12
Why it's wrong here
The range `172.32.0.0/12` is incorrect because it falls outside the IANA-reserved private Class B IPv4 address space. The designated private range for Class B is `172.16.0.0` through `172.31.255.255`, which is represented by `172.16.0.0/12`. This option is tempting as it uses the `172.` prefix and the `/12` CIDR mask, correctly associated with the Class B private range, but the starting address `172.32.0.0` is a public IP address, making the entire specified range public.
- ✗
169.254.0.0/16
Why it's wrong here
169.254.0.0/16 is link-local, not private.
- ✓
192.168.0.0/16
Why this is correct
Correct. 192.168.0.0/16 is private.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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