N10-009 · Question #331
A junior network technician at a large company needs to create networks from a Class C address with 14 hosts per subnet. Which of the following numbers of host bits is required?
The correct answer is D. Four. To support 14 hosts per subnet, you need a minimum of 4 host bits because 2^4 - 2 (for network and broadcast addresses) equals 14 usable host IP addresses.
Question
A junior network technician at a large company needs to create networks from a Class C address with 14 hosts per subnet. Which of the following numbers of host bits is required?
Options
- AOne
- BTwo
- CThree
- DFour
How the community answered
(57 responses)- A12% (7)
- B2% (1)
- C5% (3)
- D81% (46)
Why each option
To support 14 hosts per subnet, you need a minimum of 4 host bits because 2^4 - 2 (for network and broadcast addresses) equals 14 usable host IP addresses.
One host bit (2^1 - 2 = 0) provides no usable hosts.
Two host bits (2^2 - 2 = 2) provides only 2 usable hosts, which is insufficient for 14.
Three host bits (2^3 - 2 = 6) provides only 6 usable hosts, which is insufficient for 14.
To support 14 usable hosts, you need `2^n - 2 >= 14`, where `n` is the number of host bits; `2^4 - 2 = 16 - 2 = 14`, meaning 4 host bits are required.
Concept tested: Subnetting calculations (Host bits)
Source: https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-ip-addresses-overview-classic#subnets
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