X
- X Window
A distributed multitasking windowing and graphics system originally developed by MIT for communication between X terminals and Unix workstations.
- X.25
An ITU-T packet-relay standard that defines communication between DTE and DCE network devices. X.25 uses a reliable Data Link layer protocol called LAPB. X.25 also uses PLP at the Network layer. X.25 has mostly been replaced by frame relay.
Get Cisco® Network Professional's: Advanced Internetworking Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
