Computer networks 385 Certification 246 Examinations 235 Electronic data processing personnel 166 Study guides 126 Internetworking (Telecommunication) 112 Security measures 103 Telecommunications engineers 86 Routers (Computer networks) 61 Internet telephony 56 Telecommunication 53 Switching systems 44 Management 40 Firewalls (Computer security) 27 Local area networks (Computer networks) 27 TCP/IP (Computer network protocol) 25 Wireless LANs 25 Computer network protocols 22 Problems, exercises, etc 22 Computer network architectures 20 Wide area networks (Computer networks) 20 Remote access 18 Cisco IOS 17 Extranets (Computer networks) 17 Software configuration management 17 Computer security 16 Packet switching (Data transmission) 15 Business enterprises 14 Computers 14 Internet 13