N10-005 · Question #730
192.168.0.7/8 notation denotes which of the following IPv4 subnet masks?
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
How the community answered
(48 responses)- A96% (46)
- C2% (1)
- D2% (1)
Why each option
CIDR notation /8 represents 8 consecutive binary 1 bits in the subnet mask, which equals 255.0.0.0 in dotted-decimal notation.
A /8 prefix length means the first 8 bits of the subnet mask are set to 1 and the remaining 24 bits are 0, producing 11111111.00000000.00000000.00000000 in binary, which converts to 255.0.0.0. This is a Class A subnet mask that leaves 24 bits for host addressing. Any address in the 192.168.0.7/8 notation is assigned the network mask 255.0.0.0.
255.255.0.0 corresponds to a /16 prefix length, which has 16 bits set to 1, not 8.
255.255.255.0 corresponds to a /24 prefix length with 24 bits set to 1, commonly used for Class C networks.
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
Source: https://learn.microsoft.com/en-us/troubleshoot/windows-client/networking/tcpip-addressing-and-subnetting
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