| Abbreviation | Definition |
|---|---|
| CDV | Cell Delay Variation |
| CEBS | Communications E-Business Solution |
| CEF | Cisco Express Forwarding |
| CEI | Comparably Efficient Interconnection |
| CEMF | Cisco Element Management Framework |
| CEN | Center for Educational Networking |
| CEPS | Cisco Enterprise Print System |
| CERN | The Central European Research Network |
| CF | Chaos Frame |
| CFA | Continuation to Fiber Adaptor |
| CFB | Common Frame Buffer |
| CFCW | Cooperative Forward Collision Warning |
| CFI | Canonical Format Indicator |
| CFIR | Content Free Image Retrieval |
| CFLX | Communication Clarity Flags |
| CFM | Content Flow Manager |
| CFN | Compute First Networking |
| CFRN | Child and Family Research Network |
| CFS | CD-ROM File System |
| CFTP | Coherent File Distribution Protocol |