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697
direct encapsulation, DLSw+, 489
disabling CDP, 564
disaster recovery, 13
resiliency, 15
discontiguous subnets, 152
Distance Vector Multicast Routing Protocol
(DVMRP), 166
distance-vector routing protocols, 185
convergence, 198
IGRP, 233-234
convergence, fine tuning, 235
holddown, 235
metrics, 234
split horizon, 236
variance, 236
metrics, 186-187
route redistribution, 200
within the same network, 201
route summarization, 198
split horizon, 190
distribute list filters, 262
distributed backbone, 52
distributed servers in campus networks, 50
distributed switching, 193
distribution layer, 23-24
DLCI (Data Link Connection Identifier), 348-349
Frame Relay service characteristics, 350
oversubscription, 353-355
prioritization, 537
DLSw (data link switching), 487.
See also
DLSw+
dlsw icanreach command, 528
DLSw Lite, 490
dlsw remote peer tcp command, 537
dlsw rsvp command, 537
DLSw+, 488, 516
border peers, 488
IP Precedence, default mapping, 535
LLC2 encapsulation, timeouts, 490
LLC2 idle timer, 539
MTU, setting, 538
on-demand peers, 489
Passthru mode, 518
performance tuning, 538-539
policy routing, 536
priority queuing, default mapping, 535
QoS, 529-530
queuing algorithms, 532-533
traffic prioritization, 530-532
RSVP, 537
scalability, benefits of, 489
topologies
explorer control, 523-526, 529
hierarchical, 517-522
promiscuous mode, 529
transport protocol, selecting, 489-490
windowing, 538
DLUR/DLUS (Dependent Logical Unit Requester/
Server), 493
DLUs (Dependent Logical Units), 493
DMZ (demilitarized zone), 568
DNS, resolving NetBIOS names, 274
domains, 270
trusted, 276
trusting, 276
Downstream Physical Unit, 448
DRs (designated routers), 227
DSAP (destination service access point) field (LLC2
frames), 452
DSL (Digital Subscriber Line), 298
DSPUs (downstream physical units), 451-452
dual collapsed backbone (SNA), 515
DUAL finite-state machine, 238
dual shielded cable, 86
dual-backbone Token Ring, SNA implementation, 513
dual-homed gateways, 565-566
DVMRP (Distance Vector Multicast Routing
Protocol), 166
Dynamic Host Configuration Protocol.
See
DHCP
dynamic routing, path determination, 191
dynamic routing protocols, 302
E
E.164 addresses, 121
technology prefixes, 613
E.164 recommendation, 600
country code assignments, 600
E1, 599
E1 metric, 229
E2 metric, 229
echo, 617
effect on voice quality, 619
efficiency, routing protocols, 188
efficiency, routing protocols
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