How many host addresses are available in the /28 network?

The correct answer is B. 14. To calculate the number of usable host addresses in a /28 network, determine the total addresses from the host bits and subtract two for the network and broadcast addresses.

Routing Fundamentals

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Options

How the community answered

(32 responses)

A
6% (2)
B
88% (28)
C
3% (1)
D
3% (1)

Why each option

To calculate the number of usable host addresses in a /28 network, determine the total addresses from the host bits and subtract two for the network and broadcast addresses.

6 is an incorrect calculation; it would correspond to a /29 network (2^3 - 2 = 6).

B14Correct

A /28 network mask indicates that 28 bits are for the network and 32 - 28 = 4 bits are for the host portion. The total number of IP addresses in this range is 2^4 = 16. Subtracting the network address and the broadcast address leaves 16 - 2 = 14 usable host addresses.

C28

28 represents the CIDR prefix length, not the number of available host addresses.

D30

30 is incorrect; it corresponds to a /27 network (2^5 - 2 = 30).

Concept tested: IPv4 subnetting host address calculation

Source: https://docs.microsoft.com/en-us/troubleshoot/windows-server/networking/understand-tcpip-addressing-and-subnetting-basics

Topics

#subnetting#host addresses#CIDR#network calculation

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