IDG · forward each packet out the right interface (longest-prefix match)
STAGE1
DELIVERED0
STRIKES0 / 3
Routing table
incoming packet → destination
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Match the destination to the route with the longest prefix (most specific), then click that interface.
A router forwards each packet out one interface. When several routes match a destination, the most specific one wins (longest prefix — the bigger /number). Read the table, forward each packet. Three misroutes and the link fails.