N

N+1 redundancy, 130

N+N redundancy, 131

N+N+1 redundancy, 132

NAC as Cisco Self-Defending Network technology, 471 name resolution for IPv6 addresses, 272

NANP (North American Numbering Plan), 509

NAT (network address translation), 232 ND (Network Discovery) protocol, 271-272 neighbors

BGP, 391

EIGRP discovery and recovery, 335-336 OSPF adjacencies, 360 Nessus, 433 NET addresses, 373 NetFlow, 554

versus RMON, 555 NetStumbler, 433 network analysis tools, 20 network audit tools, 17, 19-20 network checklist, 20-21 network infrastructure layer (SONA), 9-10 network interface layer (TCP/IP protocol), 624

network layer (OSI model), 622 network LSAs (OSPFv3), 363, 370 network management

CDP, 555-556 NetFlow, 554

versus RMON, 555 RMON, 552

RMON2, 553 SNMP, 548

components of, 548 messages, 550-552 MIBs, 549-550 Syslog, 556-557 network phases of Cisco Self-Defending

Networks, 469 network portion of IP addresses, identifying, 236

networks, characterizing, 17

network analysis tools, 20 network audit tools, 17-20 network checklist, 20-21 Next hop field (RIPv2), 327 next-hop attribute (BGP), 397 nibbles, 631

NMAP (Network Mapper), 433 nontransitive optional attributes (BGP), 397 nontransitive optional attributes (MED),

398-399 NSSA external LSAs, 364 NSSAs (not-so-stubby areas), 365

NT1 (network termination 1), 157 NT2 (network termination 2), 157

OC (Optical Carrier) speeds, 160 ODR (on-demand routing), 307 off-net calls, 500 one-way redistribution, 405 on-net calls, 500

Operate phase of PDIOO lifecycle, 14 Optimize phase of PDIOO lifecycle, 15 optional attributes (BGP), 396 optional nontransitive attributes, MED, 398-399

optional transitive attributes, community, 399 ordering WAN technologies, 166

contract periods, 167 SLAs, 167 origin attribute (BGP), 398 OSI model application layer, 623

data link layer, 621

layered communication, example of,

625-626 network layer, 622 physical layer, 620 presentation layer, 623 session layer, 623 transport layer, 622 OSPF (Open Shortest Path First) ABRs, 362 adjacencies, 359-360 areas, 360

NSSAs, 365 stub areas, 364 totally stubby areas, 365 AS external paths, 364 ASBRs, 362 backbone routers, 362 BDRs, 362-363 cost metric, 359 DRs, 362-363 Hello packets, 359 internal routers, 361 LSAs, 363

route redistribution, 406-407

router authentication, 366 virtual links, 366 OSPFv3, 367 areas, 368 IPv6 support, 274 LSAs, 368-371

modifications from OSPFv2, 367-368 router types, 368

outside global addresses, 233 outside local addresses, 233 overlay VPNs, 189

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