200-901 Network Fundamentals Practice Question
A network engineer is subnetting the network 192.168.1.0/24 into subnets that each support at least 50 hosts. What subnet mask should be used?
⚠ Common exam trap
Cisco often tests the distinction between the number of host bits needed versus the number of subnet bits, and the trap here is that candidates may choose /25 because it supports more hosts, overlooking that /26 is the minimum mask that meets the 50-host requirement and is the correct answer per the question's wording.
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
✓
255.255.255.192 (/26)
To support at least 50 hosts, you need 6 host bits (2^6 - 2 = 62 usable addresses). A /26 subnet mask (255.255.255.192) provides exactly 6 host bits, meeting the requirement. The original /24 network is borrowed with 2 subnet bits, yielding 4 subnets of 64 addresses each.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
255.255.255.192 (/26)
Why this is correct
/26 provides 62 hosts, meeting the requirement.
- ✗
255.255.255.224 (/27)
Why it's wrong here
/27 gives only 30 hosts, insufficient.
- ✗
255.255.255.240 (/28)
Why it's wrong here
/28 gives only 14 hosts.
- ✗
255.255.255.128 (/25)
Why it's wrong here
/25 gives 126 hosts per subnet but only 2 subnets.
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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.