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Certification Computer networks 26 Security measures 26 Examinations 23 Electronic data processing personnel 21 Computer security 15 Computer technicians 4 Telecommunications engineers 3 Information technology 2 Management 2 Cloud computing 1 Computer crimes 1 Defense contracts 1 Electronic data personnel 1 Forensic sciences 1 Hacking 1 Investigation 1 Penetration testing (Computer security) 1 Standards 1