Great set of videos are offered at Professor Messer’s CompTIA SY0-301 Security+ Training .
Videos are efficient and short! Worth to have a look for learning security (no matter if aiming for Security+ or not)!
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Section 1: Network Security
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Section 2: Compliance and Operational Security
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Section 3: Threats and Vulnerabilities
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Section 4: Application, Data, and Host Security
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Section 5: Access Control and Identity Management
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Section 6: Cryptography