| A | B |
|---|
| SSH | Secure Shell |
| SSID | Service Set Identifier |
| SSL | Secure Sockets Layer |
| ST | Straight Tip |
| STP | Shielded Twisted Pair |
| T1 | T-Carrier Level 1 |
| TA | Terminal Adaptor |
| TACACS+ | Terminal Access Control Access Control System+ |
| TCP | Transmission Control Protocol |
| TCP/IP | Transmission Control Protocol/Internet Protocol |
| tcsh | turbo C shell |
| TDM | Time Division Multiplexing |
| TDR | Time Domain Reflectometer |
| Telco | Telephone Company |
| TFTP | Trivial File Transfer Protocol |
| TKIP | Temporal Key Integrity Protocol |
| TLS | Transport Layer Security |
| TTL | Time to Live |
| UDP | User Datagram Protocol |
| UNC | Universal Naming Convention |
