| Abbreviation | Definition |
|---|---|
| CNM | Container Networking Model |
| CNN | Catbox News Network |
| CNOS | Cloud Networking Operating System |
| CNP | Certified Network Planner |
| CNP | The Certified Networker Program |
| CNR | Cisco Network Registrar |
| CNR | Communication Network Riser |
| CNR | Communications Networking Riser |
| CNR | Corner |
| CNRL | Computer Networking Research Laboratory |
| CNS | Computing and Network Services |
| CNSSI | Computer & Network Support Services for Instruction |
| CNTS | Computer Networking and Technical Support |
| CO | Central Office |
| COCOM | COmplete COMmunication |
| CODEC | CODer-DECoder |
| COE | Common Operating Enviroment |
| COFDM | Coded Orthogonal Frequency Division Multiplexing |
| COI | Colours of Impact |
| COIN | County of Oxford Integrated Network |