Examinations 100 Computer security 89 Certification 84 Electronic data processing personnel 70 Computer networks 56 Security measures 53 Study guides 27 Computer technicians 13 Firewalls (Computer security) 12 Telecommunications engineers 12 Hackers 10 Computer hackers 8 Penetration testing (Computer security) 8 Computer software 4 Development 4 Internet 3 Microsoft Windows (Computer file) 3 Auditing 2 Information storage and retrieval systems 2 Management information systems 2 Microsoft software 1 Study 1