VLSM design example

FIGURE 2 . 2 VLSM design example
In this example, we have the following set of requirements for our network addressing:
 A server farm requires 300 IP addresses.
 A user segment requires 200 IP addresses.
 A serial link between two routers requires two IP addresses.
 A switched subnet interconnecting four routers requires four IP addresses.
 We have been assigned the Class B network of 172.16.0.0.
We will now go through a simple three-step process for efficiently calculating the IP address
ranges to be assigned to each segment. We say “efficiently,” because we will be using the minimum
number of IP addresses required to accomplish our goal with a few extra to account for
expected growth. Changing addresses once they’ve been implemented can be time-consuming,
costly, and may require significant down time.
1. Create a table detailing the segments and the number of hosts required on each segment, as
shown in Table 2.3.