Deductive way of reasoning about the internet AS level topology*
Szabó Dávida), Kőrösi Attilaa),c), Bíró Józsefa),b), Gulyás Andrása),c)
       
An example of the spider graph, the dashed and directed edges are the peer and customer–provider edges respectively and the black nodes are the ASes of the clique , i.e., the tier-1 ASes.