To effectively implement system and network security, a multi pronged approach should be used. Proper security policies, firewalls, proxy servers, properly complex passwords and intrusion detection systems layered together help form one of the bedrock principles called “Defense in Depth”. The purpose of defense in depth is preventing inherent and unknown flaws in the technologies deployed from allowing unauthorized access into a system or server. If one layer fails there is another to protect the failed layer. The intrusion detection system’s (IDS) job is to log attempts of unauthorized network access into the systems.
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