easy subnetting

logistic_guy

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Apr 17, 2024
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What is the maximum number of \(\displaystyle \text{IP}\) addresses that can be assigned to hosts on a local subnet that uses the \(\displaystyle 255.255.255.224\) subnet mask?

\(\displaystyle \bold{A.} \ 14\)
\(\displaystyle \bold{B.} \ 15\)
\(\displaystyle \bold{C.} \ 16\)
\(\displaystyle \bold{D.} \ 30\)
\(\displaystyle \bold{E.} \ 31\)
\(\displaystyle \bold{F.} \ 62\)
 
\(\displaystyle \textcolor{purple}{\bold{Correct.}}\)

Let us show the audience why this is the correct answer. The very short answer is:

\(\displaystyle 256 - 224 = 32 \rightarrow \ \bold{block \ size}\)

Remove the network address and the broadcast address from the block size, and you get the host addresses.

That is, max number of hosts: \(\displaystyle 32 - 2 = \textcolor{blue}{\bold{30}}\)
 
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