Electronic data processing personnel Certification 133 Examinations 131 Computer networks 59 Computer security 35 Linux 27 Computer technicians 24 Security measures 20 Cloud computing 15 Computing Technology Industry Association 14 Operating systems (Computers) 14 Maintenance and repair 13 Microcomputers 13 Management 12 Routing (Computer network management) 8 Amazon Web Services (Firm) 7 Telecommunications engineers 7 Web services 7 Client/server computing 5 Engineering & Applied Sciences 5 Systems engineering 5 Computer Science 4 Information technology 4 Microsoft Windows server 4 Switching systems 4 Telecommunication 4 Virtual computer systems 4 Cisco Systems, Inc 3 Database management 3 Penetration testing (Computer security) 3