摘要: The literature holds a great deal of research in the intrusion detection area. Much this describes design and implementation specific systems. While main focus has been study different algorithms methods, there are number other issues that equal importance to make these systems function well practice. I believe reason commercial market does not use many ideas described is still too unresolved issues. This survey focuses on presenting must be addressed build fully functional practically usable (IDSs). It points out state art each area suggests important open issues.