网络可用性提高的机制、分析与量化评估

Mechanism Analysis and Quantitative Evaluation to Improve Network Availability

随着网络应用的不断普及,网络系统的中断所造成的代价和影响与日俱增,网络的可用性被认为是网络安全的一个重要方面,因此人们对作为业务支撑平台的网络可用性要求也越来越高。目前拒绝服务比较猖獗,可用性并不能阻止拒绝服务攻击,但可用性服务可用来减少这类攻击的影响,并使系统得以正常运行。本文主要论述网络可用性概念,网络可用性机制的评价标准,提高网络可用性的四种机制,并对这四种的机制进行了比较,最后给出了如何量化评估网络可用性的公式和例子,为提高网络可用性奠定理论和实践基础。

With the growing popularity of network applications,increasing costs and effects caused by the interruption of network system is very clear.DoS（Denial of service） is very rampant now,although availability can＇t prevent denial of service attacks,availability is available to reduce the impact of such attacks and it allows the system to normal operation.This paper discusses the concept of network availability,evaluation criteria of Network availability mechanism,and four mechanisms to improve network availability and compared between four mechanisms.Finally,the formula and examples of quantitative assessment network availability is given,which lay to enhance network availability based on the theory and practice.