Abstract: This paper proposes the concepts of network blind area, asset blind area and security blind area  as they pretain to the security of large local area networks (LAN).  It analyzes the reasons behind the emergence of these three blind area, describes their forms, and points out their impacts on the security of large LAN. This paper proposes a new perspective for solving the security issues associated with large LAN.

Key words: large LAN, network blind area, asset blind area, security blind area, network security

摘要： 提出了大型局域网安全相关的网络盲区、资产盲区和安全盲区，分析了3个盲区产生的原因，阐述了3个盲区的形态，指出了3个盲区对大型局域网安全的影响，为解决大型局域网的安全问题提供了新的角度.

关键词: 大型局域网, 网络盲区, 资产盲区, 安全盲区, 网络安全