Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] [Z] UAM plug-in (Microsoft) AppleShare IP UART (Universal Asynchronous Receiver/Transmitter) chips UDF (Universal Disk Format) file systems UDP (User Datagram Protocol) 2nd Universal LAN MAC addresses Unknown Host error message (ping utility) updating antivirus software UPS (Uninterruptible Power Supplies) data availability data loss protection hardware damage protection power threat protection 2nd URL (uniform resource locator) HTTP (Hypertext Transfer Protocol) URL (uniform resource locator) filtering USB (Universal Serial Buses) as network connectors 2nd user accounts administrator accounts Mac OS X server security limited Mac OS X server security standard Mac OS X server security user authentication Linux Mac OS X server NetWare UTP (unshielded twisted-pair) cable UTP networks 5-4-3 rule 2nd |