807
private Internets, 269
See also
subnets
network masks
Class A networks, 239
Class B networks, 239
Class C networks, 239
NFS (Network File System), 77, 224
no address-violation command, 185
no cdp enable command, 46
no cdp run command, 46
no debug all command, 33, 381, 563
no ip classless command, 294
no ip domain-lookup command, 289
no ip split horizon command, 543
no keepalive command, 673
no router rip command, 382
nonbroadcast multiaccess (NBMA), 531, 600, 674
nonroot ports (Spanning Tree)
blocking on, 164
forwarding on, 164
nonroutable protocols, 109110
nonvolatile random-access memory (NVRAM), 27
Novell NetWare,
See
NetWare
Novell-ether IPX Ethernet encapsulation type, 301,
319
Novell-fddi IPX FDDI encapsulation type, 302
NSAP (network service access point), 69
NT1 (Network Termination Type 1) ISDN function
group, 572
NT1/NT2 (Network Termination Type 1/Network
Termination Type 2) ISDN function group, 572
NT2 (Network Termination Type 2) ISDN function
group, 572
numbering
router interfaces, 28
switch ports, 179
NVRAM (nonvolatile RAM), 27
O
Open Shortest Path First,
See
OSPF
Open Systems Interconnection reference model,
See
OSI reference model
Organizationally Unique Identifier (OUI), 97, 138
OSI (Open Systems Interconnection) reference
model
application layer, 75, 78, 113
benefits of the layered model, 7879
current usage, 74
data link layer, 75, 7778, 113, 568
interaction between layers, 7986
justification for, 69
network layer, 7576, 78, 113
Frame Relay concerns, 538543
ISDN specifications, 569
origin/evolution, 74
physical layer, 75, 7778, 113, 568
presentation layer, 75, 78, 113
session layer, 7576, 78, 113
transport layer, 7576, 78, 113
versus NetWare and TCP/IP protocol suites,
8687
versus other models, 77
OSPF (Open Shortest Path First), 361362, 417
auto summarization, 395
route aggregation, 395
OUI (Organizationally Unique Identifier), 97, 138
out-of-band signaling (ISDN), 569
P
packets, 85, 117
IGRP, displaying log messages, 374
IP
filtering, 460462
fragmentation, 287288
log messages, displaying, 273
MTU, 287288
IPX
filtering, 476479
sending to verify connectivity, 304
ISDN, outgoing, determining as interesting, 580
redirecting, 231
See also
datagrams, frames, segments
packet-switching services (WANs), 590
ATM, strengths/weaknesses, 591, 602
Frame Relay, strengths/weaknesses, 591, 602
X.25, strengths/weaknesses, 591, 602
PAP (Password Authentication Protocol), 525, 574
576
Parameter Problem ICMP message, 228
Parameter Problem ICMP message
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