计算机没有防火墙好比门没有上锁。随着网络攻击的不断升级,作为网络之间第一道安全屏障的防火墙,其技术也必须升级与更新,才能更好地保证网络信息的安全。从传统防火墙的不足入题,论述了网络防火墙安全技术的分类及其主要技术特征,并对其发展趋势进行展望。 The computer does not have a firewall like the door is not locked. As cyber attacks escalate, as the first security barrier between networks, the technology must be upgraded and updated to better ensure the security of network information. From the shortcomings of traditional firewall, this paper discusses the classification of network firewall security technology and its main technical features, and prospects its development trend.