N10-005 Question #730: Real Exam Question with Answer & Explanation

The correct answer is A: 255.0.0.0. CIDR notation /8 represents 8 consecutive binary 1 bits in the subnet mask, which equals 255.0.0.0 in dotted-decimal notation.

Question

192.168.0.7/8 notation denotes which of the following IPv4 subnet masks?

Options

A255.0.0.0
B255.255.0.0
C255.255.255.0
D255.255.255.255

Explanation

CIDR notation /8 represents 8 consecutive binary 1 bits in the subnet mask, which equals 255.0.0.0 in dotted-decimal notation.

Common mistakes.

B. 255.255.0.0 corresponds to a /16 prefix length, which has 16 bits set to 1, not 8.
C. 255.255.255.0 corresponds to a /24 prefix length with 24 bits set to 1, commonly used for Class C networks.
D. 255.255.255.255 corresponds to a /32 prefix length, which identifies a single host address with all 32 bits set to 1.

Concept tested. CIDR prefix length to subnet mask conversion

Reference. https://learn.microsoft.com/en-us/troubleshoot/windows-client/networking/tcpip-addressing-and-subnetting

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