A full-fibre network is a communications system where fibre-optic cable carries data over most or all of the route between users and the provider’s core network. Because fibre uses light instead of electrical signals, it can deliver high bandwidth, low latency, and strong signal stability over long distances.
In cyber security, full-fibre infrastructure matters because it improves the performance and resilience of critical services, but it also becomes a high-value dependency. Defenders use it to support redundant links, secure data-center interconnects, and faster detection and response across distributed systems. Attackers may target fibre routes, street cabinets, or carrier equipment to disrupt communications, isolate sites, or create service degradation. Even when the fibre itself is not compromised, outages, misconfigurations, or physical damage can break authentication, cloud access, and monitoring. For that reason, full-fibre networks are often treated as part of the security perimeter and the continuity plan, not just as transport.