A VLSM design allows for maximum use of IP
addresses, as well as more efficient routing update communication when
using hierarchical IP addressing. In the main figure,
for example, route summarization occurs at the following two levels:
- Router C summarizes two routing updates
from networks 172.16.32.64/26 and 172.16.32.128/26 into a single
update, 172.16.32.0/24.
- Router A receives three different
routing updates, but summarizes them into a single routing update
before propagating it to the Internet.
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