Imagine a communication network where each node is a server and each link between servers represents a communication channel. A network$$s $\backslash$textbf$\{$robustness$\}$ can be measured by the smallest number of channels that, if disrupted, would split the network into isolated groups.

For instance, a network organized like a line of servers requires just one link to be broken to cause a split, while a circular network needs two.