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vampire taps, 22, 22, 555
VDMs (Virtual DOS Machines), 228
VDSL (Very High Data-Rate Digital Subscriber Line), 325
ventilation, 264
version field, 114
versions, Macintosh OS, 237–240, 238, 240
Very High Data-Rate Digital Subscriber Line (VDSL), 325
VG LAN standards, 30
virtual COM ports, 318–319, 555
Virtual DOS Machines (VDMs), 228
Virtual LANs (VLANs), 151, 555
virtual private networks (VPNs), 72, 555
with L2TP, 372
with PPTP, 334–335, 334–335
virus engines, 438, 555
viruses, 556
scanning for, 439–441
in troubleshooting, 498
types of, 436–437
updating protection for, 437–439
VLANs (Virtual LANs), 151, 555
voltage indicators in UPSs, 418
volume, 556
volumes, disk, 420, 556
VPNs (virtual private networks), 72, 555
with L2TP, 372
with PPTP, 334–335, 334–335
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