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访问表是网络防御外来安全威胁的第一关,它是通过允许或拒绝信息流通过路由器的接口来实现的一种机制。文章就访问表的基本概念及工作原理进行了探讨,最后给出了基于访问表的各种安全控制策略及实现方案。
Access lists are the first in the network defense against external security threats and are a mechanism that is implemented by allowing or denying traffic to flow through the router’s interface. The article discusses the basic concepts and working principle of the access list, and finally presents various security control strategies and implementation schemes based on the access list.