Network resilience is the ability of a network to keep delivering essential services when it is stressed, degraded, or partially disrupted, and to recover quickly without cascading failure. It is more than simple uptime: a resilient network can absorb faults, reroute traffic, isolate damaged components, and restore normal operations with minimal impact on users.
In cyber security, resilience matters because attacks often aim to do more than steal data. DDoS floods, malware outbreaks, misconfigurations, cable cuts, or equipment failures can all interrupt connectivity, so defenders design redundancy, segmentation, failover paths, rate limiting, and monitoring to keep services available. In mobile and critical infrastructure networks, resilience also depends on stable governance and maintenance planning, because predictable investment helps operators modernize systems without creating fragile transition periods. A resilient network does not assume disruption will never happen; it assumes disruption will happen and is built to withstand it.