N

Nagle algorithm, preventing Cisco IOS from attacks,

375-376 name resolution DNS, 110-111

enabling lookup on Cisco routers, 112 on Windows NT, 292 NAT (Network Address Translation), 324 deploying, 325

Dynamic NAT, configuring, 326 monitoring, 327 operation on Cisco routers, 326 NCP (Network Control Protocol), 82 NetBEUI (NetBIOS Extended User Interface), 290 NetBIOS (Network Basic Input/Output

System), 290 NetBT, 291

NetRanger, 300 Director, 302 sensors, 300

supporting platforms, 301 typical network placement, 300 NetSonar, 302-304 netstat command (UNIX), 287 network IDS, 372 network layer bridging

BPDUs, 31 port states ICMP, 52-53 IP, 33

address classes, 36 logical AND operation, 37 packets, 34-35 subnets, 36 spanning tree protocol, 30 subnetting, VLSM, 38-39 switching, 28-29 CAM tables, 29 cut through, 30 store and forward, 30 network layer (OSI model), 23 network management, SNMP, 121

community access strings, configuring on Cisco routers, 121 configuring on Cisco routers, 124 examples of, 126 managed devices, 123 MIBs, 122-124 notifications, 122-124 Network Neighborhood, 291 newsgroups, reporting security breaches, 368 Next Hop attribute (BGP), 77 NMSs (network management systems), 123 NOOP command (SMTP), 128 normal files, 289 notifications (SNMP), 122-124

NSSAs (Not-so-stubby areas), 70

NTFS (New Technology File System), 293

NTP (Network Time Protocol), configuring clock sources, 128-131 NVRAM (nonvolatile RAM), 151 NWLink, 291

operating systems UNIX

command structure, 285-287 commands, 284-285 development of, 284 file systems, 289-290 permissions, 288-289 Windows NT, 290 browsing, 291 domains, 290 global groups, 294 local groups, 294 name resolution, 292 permissions, 293-294 SAM, 293 scalability, 292 trust relationships, 294 workgroups, 290 Origin attribute (BGP), 77 Originator ID attribute (BGP), 78 OSI reference model application layer, 25 data link layer, 22 development of, 21 network layer, 23 IP, 33-37 spanning tree, 30 switching, 28-30 peer-to-peer communication, 26 physical layer, 21

presentation layer, 24 session layer, 24 transport layer, 24 versus TCP/IP model, 25 OSPF (Open Shortest Path First), 66-68 example configuration, 71-75 media types, 70

multiple area configuration, 69-70 single area configuration, 66, 69 virtual links, 71 outside global addresses, 324 outside local addresses, 324

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