How many WAN links are required to create a full mesh of connections between five remote sites?

To create a full mesh of connections between five remote sites, you need to connect each site to every other site. The formula to calculate the number of WAN links required for a full mesh is ( n(n-1)/2 ), where ( n ) is the number of sites. For five sites, this results in ( 5(5-1)/2 = 10 ) WAN links. Thus, you would need 10 WAN links to establish a full mesh configuration.