| A | B |
|---|
| PPP | Point-to-Point Protocol |
| SMDS | Switched Multimegabit Data Services |
| ISDN | integrated services digital network |
| LAPB | Link Access Procedure-Balanced |
| HDLC | High-level Data Link Control |
| SDLC | synchronous data link control |
| SVC | switched virtual circuit |
| PVC | permanent virtual circuit |
| ATM | Asynchronous Transfer Mode |
| DDR | Dial-on-Demand Routing |
| CSU/DSU | Channel Service Unit/Data Service Unit |
| Modem | modulator-demodulator |
| BRI | Basic-Rate Interface |
| EIA | Electronic Industries Alliance |
| HSSI | High-Speed Serial Interface |
| TIA | Telecommunications Industry Association |
| RIP | Routing Information Protocol |
| OSPF | Open Shortest Path First |
