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Exam N10-009 Topic 6 Question 367 Discussion

Actual exam question for CompTIA's N10-009 exam
Question #: 367
Topic #: 6
A security administrator is creating a new firewall object for a device with IP address 192.168.100.1/25.
However, the firewall software only uses dotted decimal notation in configuration fields. Which of the following is the correct subnet mask to use?

Suggested Answer: C Vote an answer

A /25 subnet mask means 25 bits are reserved for the network portion, leaving 7 bits for host addresses. In dotted decimal, that is:
11111111.11111111.11111111.10000000
Decimal equivalent: 255.255.255.128
A). 255.255.254.0 corresponds to /23.
B). 255.255.255.1 is invalid as a subnet mask.
D). 255.255.255.192 corresponds to /26.
Thus, the correct subnet mask for a /25 network is 255.255.255.128.
References (CompTIA Network+ N10-009):
Domain: Networking Concepts - Subnetting, CIDR notation, dotted decimal.

by Lennon at May 07, 2026, 03:46 PM

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