传统上大多数网络都依赖防火墙和防病毒措施来实现网络安全，这些解决方案侧重于来自企业外部的威胁。但是，防火墙可能遭到破坏，而且一旦发生这种情况，如果没有额外的保护层，黑客就可以无限制地访问网络资源。另外，调查表明，由网络内部人员造成的安全破坏比外来入侵者更 Traditionally, most networks rely on firewalls and antivirus measures to secure their networks. These solutions focus on threats from outside the enterprise. However, the firewall can be compromised, and once that happens, hackers can gain unrestricted access to network resources without additional layers of protection. In addition, surveys have shown that security breaches caused by insiders in the network are more than intruders