Computer networks Examinations 44 Certification 42 Security measures 38 Electronic data processing personnel 34 Computer security 21 Management 16 Design and construction 9 Cloud computing 6 Development 6 Penetration testing (Computer security) 6 Routing (Computer network management) 6 Computer network protocols 5 Computer software 5 Information technology 5 Telecommunications engineers 5 Cisco Systems, Inc 4 Hacking 4 Operating systems (Computers) 4 Packet switching (Data transmission) 3 Access control 2 Application software 2 Cisco IOS 2 Computer technicians 2 Computers 2 Hackers 2 Internetworking (Telecommunication) 2 Linux 2 Local area networks (Computer networks) 2 Monitoring 2