CNX is an acronym that can contain many meanings which are listed below.
CNX – Certified Network eXpert
There may be many popular meanings for CNX with the most popular definition being that of Certified Network eXpert
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CNX (Certified Network Expert) is a designation given to those individuals who passed a certification exam based upon knowledge of packet analyzation and network proficiency. While not mandatory, a typical individual taking the exam had attended Sniffer University offered by Network General.
Topics covered: General networking knowledge of hubs, routers, switches, OSI Model, protocol analysis, packet architecture, and troubleshooting using a network analyzer.
To my knowledge, the CNX ceased being offered approximately around 2003.