200-301 Question #766: Real Exam Question with Answer & Explanation

The correct answer is A: 172.16.9.0. Given a subnet mask of 255.255.248.0, valid host addresses reside within the range between the network address and the broadcast address of each subnet.

Submitted by jordan8· Mar 5, 2026Network Fundamentals

Question

Assuming a subnet mask of 255.255.248.0, three of the following addresses are valid host addresses. Which are these addresses? (Choose three.)

Options

A172.16.9.0
B172.16.8.0
C172.16.31.0
D172.16.20.0

Explanation

Given a subnet mask of 255.255.248.0, valid host addresses reside within the range between the network address and the broadcast address of each subnet.

Common mistakes.

B. The address 172.16.8.0 with a /21 subnet mask (255.255.248.0) is the network address for its respective subnet and thus cannot be assigned to a host.

Concept tested. Valid host addresses in subnetting

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_nat/configuration/xe-3s/ipnat-xe-3s-book/ipnat-config-ip-address.html

Topics

#Subnetting#IP addressing#Host addresses

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