easy subnetting - 2

[logistic_guy]

You have a network that needs \(\displaystyle 29\) subnets while maximizing the number of host addresses available on each subnet. How many bits must you borrow from the host field to provide the correct subnet mask?

\(\displaystyle \bold{A.} \ 2\)
\(\displaystyle \bold{B.} \ 3\)
\(\displaystyle \bold{C.} \ 4\)
\(\displaystyle \bold{D.} \ 5\)
\(\displaystyle \bold{E.} \ 6\)
\(\displaystyle \bold{F.} \ 7\)

 

[logistic_guy]

Let us analyze.

\(\displaystyle 1\)-network bit gives: \(\displaystyle 2^1 = 2 \rightarrow\) subnets

\(\displaystyle 2\)-network bits give: \(\displaystyle 2^2 = 4 \rightarrow\) subnets

\(\displaystyle 3\)-network bits give: \(\displaystyle 2^3 = 8 \rightarrow\) subnets

\(\displaystyle 4\)-network bits give: \(\displaystyle 2^4 = 16 \rightarrow\) subnets

\(\displaystyle 5\)-network bits give: \(\displaystyle 2^5 = 32 \rightarrow\) subnets

Well since \(\displaystyle 29 < 32\), borrowing \(\displaystyle 5\) bits would satisfy the needs.

How many bits

\(\displaystyle \bold{D.} \ 5\)