Index 671
User Datagram Protocol. See UDP
User-to-Network Interface. See UNI
Utilization, 302
UTP cable, 159–163, 180, 216, 219, 222, 231,
292
categories summary table, 162
categories, 162
connectors, 213
installation guidelines, 567
UUCP, 57
V
Variable-bit rate (VBR), 438, 524
vBNS+, 64–66
VCC, 432
VCI, 432–435
VDSL, 458
See also DSL
Very high performance backbone network
service +. See vBNS+
Very-high-data-rate DSL. See VDSL
Videotext, 376
Virtual channel connection. See VCC
Virtual channel identifier. See VCI
Virtual circuit, 40, 156, 393
defined, 40
frame relay, 384
ISDN, 372
permanent. See PVC
switched. See SVC
Virtual local area networks. See VLANs
Virtual path connection. See VPC
Virtual path identifier. See VPI
Virtual private networks. See VPNs
Virtual ring, 353
Virtual terminal service. See TELNET
VLANs, 269, 305, 311–312
Voice over IP. See VoIP
VoIP, 137, 512, 524, 527–531
defined, 528
delay issues, 529
H.323 and, 532–531
hardware components, 531
illustrated, 533–534
protocols, 530
QoS issues, 530
Voltage, 147
VPC, 432, 433
VPI, 432–435
VPNs, 100, 137–38, 212, 252, 271–283, 420,
503, 504
benefits, 271
case study, 278
configurations, 281
security protocols, 272
tunnel, 272
W
WAN, 10–11, 211, 239, 247, 249
circuit-switched, 239
packet-switched, 239
Wavelength division multiplexing. See WDM
Wavelength, 143–144, 161, 173
WDM, 152, 154
illustrated, 155
Wearable computing, 509, 522
Web browser, 5, 16, 18
Web pages 5
Well-known ports, 87, 102
defined, 87
numbers, 103
Wide area network. See WAN
Wi-Fi, 175–176
Windows NT, 6, 16–18
Wire speed, 231, 307
Wireless Application Protocol (WAP), 552
Wireless communications, 6, 152, 170–171,
537–562
advantages and disadvantages, 559
defined, 537
history, 538
infrared. See
Infrared transmissions
lightwave, 174
microwave, 6
radio. See RF transmissions
satellite, 6
See also Wireless networking
Wireless Ethernet Compatibility Alliance
(WECA), 175
Wireless LAN Alliance, 176
Wireless LANs. See WLANs
Wireless Markup Language (WML), 552
Wireless networking, 65, 537–562
appliances, 561
Bluetooth, 559
cellular communications. See Cellular
communications
current trends, 540
data networks
access points (APs), 553
HomeRF, 467, 552
operation of, 553

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