Certification Examinations 890 Electronic data processing personnel 815 Computer networks 370 Computer security 163 Engineering & Applied Sciences 149 Security measures 142 Computer technicians 136 Cloud computing 122 Computer Science 109 Telecommunications engineers 104 Microcomputers 90 Computing Technology Industry Association 85 Maintenance and repair 85 Microsoft software 83 Management 75 Operating systems (Computers) 57 Linux 52 Electrical & Computer Engineering 51 Telecommunications 48 Information technology 47 Microsoft Windows server 47 Internetworking (Telecommunication) 41 Microsoft Windows (Computer file) 38 Amazon Web Services (Firm) 36 Virtual computer systems 32 Web services 30 Database management 29 Routing (Computer network management) 28 Client/server computing 27