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Elements of Network Security Introduction The primary aim of a community security system is to, at a economical fashion, balance convenient access to legitimate users and inaccessibility to attackers. In brief, the purpose is to prevent connectivity to anybody planning to cause harm to the network. The harm to which this paper describes can come in the following forms: 1). Application-level security dangers, such as e-mail debris and viruses. 2. Hazards to network infrastructure devices. 3. Theft of network connectivity services. 4. Unauthorized access from internal and external resources. 5. Denial of service attacks. Employing a proper network security strategy reduces and, in some cases, even avoids the listed harmful attacks from occurring on a network (Gary, T., et al, Mar. 2002). This paper will discuss such a strategy utilized by the Los Angeles Department of Water and Power (LADWP), in addition to the strategy's three primary elements: prevention, detection, and recovery. Prevention Surprisingly, the most frequent threat to a firm's information assets does not come from the sly and cunning computer hacker that's glamorized by Hollywood movies, but from human error, inappropriate disclosures, and sheer carelessness on the part of the company's employees. Hackers who do intentionally tamper with the corporation's network often do so because they are tempted by assets they know are poorly protected. Weak security policies present the image that a company does not truly value its assets, which in turn attracts the petty thief and curiosity seeker. Therefore, the preventive element of any network security system should incorporate a strong and enforceable security policy for its employees to follow, re-enforced by a form.