如果防火墙够强，或冗余性和恢复力足以让其快速回复，或有可能产生自我强化反应 （ “ 电围栏 ” ） ，实施攻击就会变得不再具有吸引力。
If firewalls are strong, or redundancy and resilience allow quick recovery, or the prospect of a self-enforcing response (“an electric fence”) seems possible, an attack becomes less attractive.