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Most IT professionals already have a casual knowledge of security topics, absorbed through osmosis and brute experience. Most IT professionals can learn enough to do them some good in three-to-six months. Entry-level security certs typically require one-to-two years of "relevant experience" (which is arguably conferred by installing and updating antivirus software). Mid- to senior-level credentials tend to be more stringent, requiring three-to-seven years of demonstrable, relevant experience (if not more, in some cases).
For more information on this topic, visit these other SearchSecurity.com resources:
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