The main purpose of Access Control, a major technique of network security prevention and protection, is to safeguard network resources from being illegally visited and used.
访问控制作为网络安全防范和保护的主要技术，主要任务是保证网络资源不被非法访问和使用。
Traditional security technique base on protection basically, but protection technique can only stop attack attempt to the best of its ability and leave this process.
传统的安全技术都基本上立足于防护，但是防护技术只能做到尽量阻止攻击企图的得逞和延缓这个过程，而不能阻止各种入侵行为的发生。
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