N

name queries, 563

name resolution

configuring, 42–43

e-mail reliance on, 587

named daemon

about DNS, 559

starting, 573

named.ca file, 566

named.local file, 567, 568

names

canonical, 802

characters allowed in hostnames, 568

NetBIOS, 519

partitions, 97–98

reserved domain, 466

RPM package, 223

WINS name resolution, 519, 528, 817

NAT (Network Address Translation), 703–706

about, 703

defined, 809

IP forwarding, 705

IP masquerading, 703–705

prerequisite skills for, 48

troubleshooting, 706

National Security Agency (NSA), 706

navigating files, 19–20

netstat command, 42, 338–339, 340, 809

network adapters. See NICs

Network Address Translation. See NAT

network configuration, 331–340

arp command as diagnostic tool for, 339–340

during installation, 107–108

exam tips for, 331

ifconfig command for, 42, 333, 337–338, 339, 742, 743, 806

ifup/ifdown commands for, 333, 337

installation for, 81–88

netstat command for, 338–339, 340

setting up network interface, 333–340

system-config-network to modify interface, 334–336

tool for DHCP clients, 340

variables for /etc/sysconfig/network file, 331–332

Network Configuration utility, 333–334

illustrated, 334

modifying network interface with system-config-network in, 334–336

tabs of, 336

using during exam, 337

network file sharing services, 494–556. See also NFS servers; Samba

configuring NFS server, 494–509

creating Samba public access shares, 540–541

file locking issues for NFS, 504

FTP and vsFTPd, 512–515

lab questions and answers, 549–551, 553–556

major protocols for, 494

performance tips for NFS, 504–505

Samba services, 516–544

self test and answers, 548–549, 552

setting up for Samba servers, 529–533

sharing NFS directories with client computers, 509–512

statelessness of NFS, 502–503

two-minute drill, 546–547

Network Information System (NIS), 810

network installation servers, 81–88

configuring, 81

FTP, 85–86, 94, 95, 512–515

HTTP, 83–85, 94, 95

NFS, 81–83, 494–509

other requirements to setup, 86–87

Network Interface Cards. See NICs

Network Port options (SELinux Management Tool), 715

network security

allowing and denying files, 48

Extended Internet Services

Daemon, 47

iptables command, 48–49

Network Address Translation, 48

Network Information Service, 47

overview of skills for, 47

securing ports, 48

network services. See specific services

Network Time Protocol. See NTP

networks. See also network configuration; network services; system administration tools

adding Linux to Windows, 528

authenticating with NIS and LDAP, 313–317

basic security for, 47–48

configuring, 107–108, 331–340

controlling resource access with tcp_wrappers, 696–697

defining with IP addresses, 40–41

IP addressing configured with Kickstart Configurator, 259

knowing how to protect, 693

options in linux rescue mode, 736–737

packet handling on, 697

searching NIS and LDAP databases with Name Service Switch file, 315–316

security for, 47–49

setting up installation servers for, 81–88

solving problems with hostname resolution, 744

TCP/IP, 38–43

troubleshooting, 330, 742–743

X Window System designed for, 675

New Printer wizard, 344–346

New Volume Group dialog (GUI LVM Management tool), 427

nfs daemon, 497

NFS (Network File System). See also NFS clients; NFS servers

about, 44, 494–495

absolute and relative symbolic links, 503

activating list of exports, 498–499

adding shared directory, 499–502

command line configurations of, 506

configuring servers, 494–509

defined, 809

diskless clients, 511

/etc/exports configuration file for, 497–498

file locking issues for, 504

installations for exam, 495

inverse DNS pointers with, 504

lab questions and answers, 549–551, 553–556

options in SELinux Management Tool for, 713

performance tips for, 504–505

quotas on directories in, 299–300

reducing security risks for, 506

required RPM packages for, 496

root squash behavior of, 503

running through firewalls, 501

security risks for, 505–506

self test and answers, 548–549, 552

server startup configurations for, 496–497

sharing directories with clients, 509–512

statelessness of, 502–503

system processes for NFS clients, 510

troubleshooting hangs with, 503–504

two-minute drill, 546–547

using wildcards and globbing in, 498

working with SELinux, 502

NFS clients, 509–512

diskless, 511

hang when shutting down NFS server, 503–504, 507–508

mounting remote directory during boot process, 511

shared directory mounting via command line, 510

soft mounting, 511–512

system processes for, 510

troubleshooting NFS hangs, 503–504, 507–508

NFS file handle, 502

NFS Server Configuration tool, 499–502

activating shared directories at appropriate runlevels, 501

corresponding commands for /etc/exports, 500

creating shared directory with, 508–509

General Options tab, 499–500

illustrated, 499, 500

NFS servers, 494–509

about NFS standard, 494–495

activating list of exports, 498–499

client hangs when shutting down, 503–504, 507–508

configuring, 494–509

creating installation servers, 81–83

/etc/exports configuration file for, 497–498

exam topics on, 495

quirks and limitations of, 502–504

RPM packages required for, 496

running through firewalls, 501

startup configurations for, 496–497

time-efficient installations via, 92–95

using wildcards and globbing, 498

working with SELinux, 502

nfs-utils RPM package, 496

NICs (Network Interface Cards). See also network configuration

assigning IP addresses to specific, 630

configuring, 87, 88, 334–336

defined, 809

ifconfig switches for, 339

network scripts for, 332

setting up DHCP client, 632, 633

troubleshooting unrecognized second, 336

NIS (Network Information Service)

about, 272

checking database with Red Hat

Authentication Configuration tool, 316–317

defined, 810

exam requirements for client connections in, 313

prerequisite skills for, 47

searching database with Name Service Switch file, 315–316

setting up network clients, 314

nmbd daemon, 520

no mount linux rescue environment, 741–742

nslookup command, 575

NTP (Network Time Protocol), 634–637

about, 614, 634, 809

client configuration for, 634–635

exam coverage of, 615

illustrated, 635

lab questions and answers, 641–642, 644–647

problems with SELinux and, 635

self test and answers, 640–641, 643

setting up local NTP server, 636–637

summarized, 637

two-minute drill for, 639

ntsysv configuration tool, 168