200-901 Network Fundamentals Practice Question
Which IP address is a valid host address in the 192.168.1.0/24 network?
⚠ Common exam trap
The trap is forgetting that the first and last addresses in any subnet are reserved — candidates often pick the broadcast (.255) or network (.0) address as a valid host.
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
✓
192.168.1.128
In 192.168.1.0/24, usable host addresses range from 192.168.1.1 through 192.168.1.254. The address 192.168.1.128 falls within this range and is not the network or broadcast address, so it is a valid host address. It is a normal unicast address that can be assigned to a device.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
192.168.1.128
Why this is correct
192.168.1.128 falls within the 192.168.1.0/24 subnet range, satisfying the network constraint. Unlike the network address (192.168.1.0) or broadcast address (192.168.1.255), it is assignable to a host device. The /24 mask leaves 254 usable host addresses, and .128 sits comfortably inside that pool.
- ✗
192.168.2.1
Why it's wrong here
192.168.2.1 lies in the adjacent 192.168.2.0/24 subnet, outside the 192.168.1.0/24 range defined by the /24 mask. It appears valid because it is a private RFC 1918 address, but only 192.168.1.1 through 192.168.1.254 belong to this network.
- ✗
192.168.1.255
Why it's wrong here
192.168.1.255 is the /24 broadcast address, so it addresses every host on the subnet rather than a single interface. It is tempting because it falls inside the subnet range, but broadcast is reserved; a valid host would be 192.168.1.1 through 192.168.1.254.
- ✗
192.168.1.0
Why it's wrong here
192.168.1.0 is the network address, identifying the subnet itself, so it cannot be assigned to an interface. It looks usable because it sits in range, but RFC 950 reserves the all-zero host portion; valid hosts run from 192.168.1.1 to 192.168.1.254.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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.