Certification 15 Examinations 15 Telecommunications engineers Computer networks 11 Electronic data processing personnel 7 Routing (Computer network management) 3 Security measures 3 Computer network protocols 2 Computer security 2 Engineering & Applied Sciences 2 Management 2 Switching systems 2 Telecommunication 2 Cisco IOS 1 Computer Science 1 Data transmission systems 1 Directory services (Computer network technology) 1 Electrical & Computer Engineering 1 Internet telephony 1 Internet videos 1 Local area networks (Computer networks) 1 Microsoft Windows server 1 Operating systems (Computers) 1 Penetration testing (Computer security) 1 Streaming video 1 Telecommunications 1