U
- UDP
-
User Datagram Protocol. Built on top of IP at the transport layer, UDP provides a datagram-based service.
- UDLM
-
UNIX distributed lock manager.
- UFS
-
UNIX file system.
- UPS
-
uninterruptible power supply.
- UTC
-
universal time coordinated.
- UTP
-
unshielded twisted pair.
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