JN0-102 · Question #294
You have been assigned the /24 network and need to segment it into at least 60 subnets. Which network mask meets this requirement?
The correct answer is D. /30. To segment a /24 network into at least 60 subnets, you must borrow a sufficient number of host bits to create 64 subnets, which corresponds to a /30 network mask.
Question
You have been assigned the /24 network and need to segment it into at least 60 subnets. Which network mask meets this requirement?
Options
- A/27
- B/28
- C/29
- D/30
How the community answered
(62 responses)- A16% (10)
- B8% (5)
- C3% (2)
- D73% (45)
Why each option
To segment a /24 network into at least 60 subnets, you must borrow a sufficient number of host bits to create 64 subnets, which corresponds to a /30 network mask.
A /27 network mask borrows 3 bits from a /24, resulting in 2^3 = 8 subnets, which is fewer than the required 60.
A /28 network mask borrows 4 bits from a /24, resulting in 2^4 = 16 subnets, which is fewer than the required 60.
A /29 network mask borrows 5 bits from a /24, resulting in 2^5 = 32 subnets, which is fewer than the required 60.
Starting with a /24 network, borrowing 6 bits from the host portion results in a /30 network mask, which creates 2^6 = 64 subnets, satisfying the requirement for at least 60 subnets.
Concept tested: Subnetting a given network using CIDR
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dns/configuration/xe-3s/iad-xe-3s-book/iad-ipv4-addr-cfg.html
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