(computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet
a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle
firewall的用法和樣例：
例句
The proxy firewall maintain context more easily than the packet filter firewall. 代理防火牆比包過濾器防火牆易於保持更多的上下文
The firewall sit between the power phone system internal network and the public data network. 防火牆位於強力電話系統內部網路與公共數據網路之間。
The packet filter rout provide the same functionality as the packet filter firewall describe in section2.1.1. 包過濾路由器與包過濾防火牆具有同一功能，如2。1。1部分所述。
Inside of the firewall the only permit destination for traffic from the interior or exterior route is the bastion host. 在防火牆內部，對於來自內外部路由器的通信量來說，唯一允許到達的目的地是bastion主機。
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