Sample network

Sample network
North
West 10.0.0.0/10
10.128.0.0/10 South
10.192.0.0/10
East
10.64.0.0/10
IP Address Assignment
365
If one region needs more addresses, then you would need to change the allocations. You
don’t always have an even 1/4 split, but you may have a 1/2, 1/4, 1/8, 1/8 split. This is fine, but
you should try to allocate each region from address space that can be aggregated to a small number
of prefixes.
Now we will look at a single region and see how these addresses are further divided to
accommodate the number of devices within a zone. Each zone represents a single geographical
area and acts as an aggregation point for that area. Figure 11.5 shows the West region and the
zones within that region.
There are 10 zones in the West region, and each zone is allocated
1
⁄
16
of the address space allocated
to the entire region. The region was allocated 10.128.0.0/10. Table 11.2 shows the 10
zones and their address space allocation.

Region Address Space
North 10.0.0.0/10
East 10.64.0.0/10
West 10.128.0.0/10
South 10.192.0.0/10