Table 1

Summary of SNA-based node-selection logics and mapping to fortification objectives

Node-selection logicInterpretationFortification objective
Node degreeQuantifies direct links; more links = more immediate connectivityMaintain operational continuity + prevent disruption spread via connected/important node(s)
Degree centralityQuantifies node's connections relative to whole networkMaintain operational continuity + prevent disruption spread via relatively connected/important node(s)
Closeness centralityQuantifies how quickly a node can reach all othersMaintain operational continuity + prevent disruption spread via gateway node(s)
Betweenness centralityQuantifies how often a node is in the shortest path between other nodesMaintain operational continuity + prevent disruption spread via intermediary/bridging node(s)
Page rankQuantifies a node's influence by weighting incoming links by the influence of their sourcesMaintain operational continuity + prevent disruption spread at influential hub node(s)
Source(s): Kim et al. (2011), Mizgier et al. (2013), Hua et al. (2025), Page et al. (1999) 

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