But as soon as the threat is passed, the entrance is open again, and maybe there are situations in computer security where operating costs are low enough that we could just block access temporarily in response to an immediate threat, and then open it again, instead of trying to build a permanent firewall or fortress.
Quizá hay situaciones en la seguridad informática, donde los gastos operativos son lo suficientemente bajos como para bloquear el acceso temporalmente en respuesta a una amenaza y luego abrirlo, en vez de construir un fuerte o un firewall permanente.