Internet Technologies 简明教程

Firewall Security

Firewall 是本地局域网 (LAN) 和互联网之间的屏障。它允许保持私人资源的机密性，并最大程度减少安全风险。它还可以双向控制网络流量。

Firewall is a barrier between Local Area Network (LAN) and the Internet. It allows keeping private resources confidential and minimizes the security risks. It controls network traffic, in both directions.

以下图表显示了局域网和互联网之间的示例防火墙。这两者之间的连接是易受攻击的点。硬件和软件都可以在此点上用于过滤网络流量。

The following diagram depicts a sample firewall between LAN and the internet. The connection between the two is the point of vulnerability. Both hardware and the software can be used at this point to filter network traffic.

internet firewall

Key Points

Key Points

  1. Firewall management must be addressed by both system managers and the network managers.

  2. The amount of filtering a firewall varies. For the same firewall, the amount of filtering may be different in different directions.