因此，架构师经常还希望利用现有的安全机制，如源系统的身份验证和授权。
As a consequence, architects often intend to also leverage existing security mechanisms such as authentication and authorization of the source systems.
iptables 命令的可选 match 部分指定信息包与规则匹配所应具有的特征（如源和目的地地址、协议等）。
The optional match section of the iptables command specifies the characteristics that a packet should have to match the rule, such as source and destination address, protocol, etc.
如果你是从自己的CD上导出或从正版源下载，如亚马逊，那你该把此音乐文件夹安全排除。
If you've ripped your own CDs or downloaded from somewhere legitimate like Amazon, then you can safely exclude your music folder.
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