There are three different type of network topologies.
1. Hub-and-spoke
2. Full mesh
3. Hybrid
How to calculate WAN links?
Here is how to calculate the number of links in hub-and-spoke and full mesh networks
S = number of Site
L = number of link
Hub-and-spoke : L = S -1
ex) 6 sites for number of links for 5
Full mesh : L = S(S-1)/2
ex) 6 sites for number of links for 15
Hybrid networks can be arranged in any fashion that best fits the needs of services, so there are no predictable shape for the number of link required.
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