| The main figure shows a VLSM example used
to optimize the number of possible addresses available for a
network. Because point-to-point serial lines require only two host
addresses, you want to use a subnetted address that will not waste
scarce subnet numbers.
In the figure, the addresses used are those generated in the
earlier section "Calculating VLSMs." The figure illustrates
where the addresses can be applied, depending on the network layer,
and the number of hosts anticipated at each layer. For example, the
WAN links use Class B addresses with a prefix of /30. This prefix
allows for 16,382 subnets (214-2) and only two hosts (22-2) --- just
enough hosts for a point-to-point connection between a pair of
routers.
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Lab
Activity |
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In
this lab, you will learn how to create
an addressing scheme using variable length
subnet masking (VLSM). |
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