2, the variance, the variance calculation parameters, set the confidence interval, when the measured value exceeds the range of confidence intervals that may be abnormal; 3, the multivariate model, the operating model of the expansion, through the simultaneous analysis of multiple parameters to achieve detection; 4 , Markov process model, each type of event is defined as the system state, with the state transition matrix to represent the state changes, when an event occurs, or the state of the transfer matrix may be a low probability of abnormal events; 5, time series analysis, event count and resources arranged according to the time sequence of consumption, if a new event at the time of the low probability of occurring, the event may be compromised. The biggest advantage of statistical methods is that it can "learn" the users habits, which has a higher detection rate and availability. But its "learning" ability to the intruder the opportunity through the gradual "training" to meet the normal operation of the invasion of statistical laws, which through the intrusion detection system.
The new Windows version of the server, can be said that Microsofts tailored for server-level Netbook, that is, ultra-low cost small firms lock server. This product is sold only random pre-installed version. Microsoft CEO Steve Ballmer held in February, said the law had notice of the meeting, will launch this product. He was also one of the reasons explained. He said: From the revenue perspective, we will launch a new low-cost, low-cost, simple function of Windows servers. If you view this product, with the server price, hardware prices drop, we did not see an Netbook phenomenon; However, if someone buy a $ 500 server, you may hate to spend $ 500 to buy the server uses the operating system. Therefore, we will provide a server-level Netbook products, and in one to two months after the launch of Foundation version. Microsoft also said that by the end of September, the part of the Windows Server Foundation will donate TechSoup.org revenue and Telecentre.org the two organizations in support of their non-profit organization to promote the use of technology. Ballmer: We put this as a great opportunity for business growth can provide the technical foundation, but also lay the financial foundation for the community. Side by side lay off Microsofts recruitment of foreign workers incurred the condemnation of the United States, with the slow pace of recruitment, recruitment of H1-B visa employees is decreasing.