JN0-102 · Question #295
You must segment your internal /24 network into a minimum of 12 subnets, each containing a minimum of 12 hosts. Which network mask do you use?
The correct answer is C. /28. To segment a /24 network into at least 12 subnets, each supporting a minimum of 12 hosts, a /28 network mask is required.
Question
You must segment your internal /24 network into a minimum of 12 subnets, each containing a minimum of 12 hosts. Which network mask do you use?
Options
- A/26
- B/27
- C/28
- D/29
How the community answered
(41 responses)- A2% (1)
- B7% (3)
- C73% (30)
- D17% (7)
Why each option
To segment a /24 network into at least 12 subnets, each supporting a minimum of 12 hosts, a /28 network mask is required.
A /26 mask provides 62 usable hosts but only 4 subnets, which is less than the required 12 subnets.
A /27 mask provides 30 usable hosts but only 8 subnets, which is less than the required 12 subnets.
A /28 mask provides 4 subnet bits (2^4 = 16 subnets, meeting the >= 12 requirement) and leaves 4 host bits (2^4 - 2 = 14 usable hosts, meeting the >= 12 requirement). This satisfies both conditions for subnetting the /24 network.
A /29 mask provides only 6 usable hosts, which is less than the required 12 hosts per subnet.
Concept tested: CIDR subnetting calculation
Source: https://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13788-3.html
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