200-901 Network Fundamentals Practice Question
A network administrator is configuring subnetting for a new branch office that requires 50 usable host addresses per subnet. The available network is 192.168.10.0/24. What subnet mask should be used to meet the requirement with minimal 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 mask provides 62 usable hosts (2^(32-26)-2=62), which is the smallest subnet that supports 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.
- ✗
255.255.255.128 (/25)
Why it's wrong here
/25 provides 126 usable hosts, which is more than needed.
- ✗
255.255.255.224 (/27)
Why it's wrong here
/27 provides 30 usable hosts, insufficient.
- ✓
255.255.255.192 (/26)
Why this is correct
/26 provides 62 usable hosts, suitable for 50 hosts.
- ✗
255.255.255.240 (/28)
Why it's wrong here
/28 provides 14 usable hosts, insufficient.
Visual reference
Go deeper
Related to this question
About these practice questions
Courseiva writes every 200-901 question from scratch — 989 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.