200-901 Network Fundamentals Practice Question
A network administrator is configuring a new subnet for a branch office that requires at least 50 usable host addresses. Which subnet mask would meet this requirement while minimizing address waste?
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)
A /26 subnet provides 62 usable hosts (2^6 - 2 = 62), which is the smallest subnet meeting the requirement of 50 hosts.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
255.255.255.0 (/24)
Why it's wrong here
/24 provides 254 usable hosts, which wastes many addresses.
- ✗
255.255.255.128 (/25)
Why it's wrong here
/25 provides 126 usable hosts, also wasteful.
- ✗
255.255.255.224 (/27)
Why it's wrong here
/27 provides only 30 usable hosts, insufficient.
- ✓
255.255.255.192 (/26)
Why this is correct
Correct. /26 gives 62 usable hosts, fitting 50 with minimal waste.
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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.