Vocabulary List T + U
| T reference point | T1 | T3 | tag switching | tagged traffic | TCP | TCP/IP | TDM | TE | TE1 |
| TE2 | telco | Telnet | 10BaseT | terminal adapter | terminal emulation | TFTP | thicknet | thinnet | token |
| token bus | token passing | Token Ring | toll network | trace | transparent bridging | Transport layer | TRIP | trunk link | TTL |
| TUD | tunneling | U reference point | UDP | unnumbered frames | UTP |
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