tabletype options for iptables command, 698
tail command, 22
tape backups, 37
tar command, 38
tar files, 396
tarballs, 23
TCP SYN attacks, 383, 700
TCP/IP networking, 38–43, 59
configuring name resolution, 42–43
defined, 815
defining network with IP addresses, 40–41
IP numbers and address classes, 39
IPv6 addressing, 39–40
network card configuration for, 87, 88
overview, 38–39
Samba and, 519–520
tools and commands for, 41–42
typical port numbers for, 615–616
tcp_wrappers, 693–697
configuring, 696–697
operators for, 696
securing users and host with, 694–696
Telnet
controlling resource access with tcp_wrappers, 695, 696–697
defined, 816
enabling with xinetd, 620
using Kerberos-based, 624
vulnerabilities of, 624
xinetd and, 614
testing. See also self test and answers
changes to /etc/samba/smb .conf, 542
disk quotas, 297
kickstart configuration, 248
mail system, 600–601, 602–603
RPM packages, 225
troubleshooting scenarios, 731
testparm utility for Samba, 542
text editors, 8–11. See also vi
about, 8
availability during exam, 11
configuring Samba with shares, 543–544
emacs, 803
vi, 8–10
text-based tools
accessing URLs with text browsers, 50–51
configuring Samba with shares in text editor, 543–544
controlling services with, 168
editing Apache configuration files with, 475
GUI-text editors availability during exam and, 11
learning command line configurations for NFS, 506
modifying user accounts with, 282
running First Boot process with, 126
Samba configuration in text editor, 517
setting up network interface with, 333
timesavings of, 281
third-party repositories
about, 54, 237
adding to system, 242
resynchronizing headers of, 241
tilde (~), 20
time
configuring timezones, 108
setting system date and, 123, 124
time synchronization. See NTP
timesavings
configuring system during installation "dead time", 120
editing Apache configuration files from command line, 475
installing via remote NFS server, 92–95
redoing installation rather than fixing, 126
selecting correct desktop environment, 112
setting Samba global configurations from command line, 537
testing mail system from command line, 600–601
time required for LVM partitions, 103
timing for DNS servers, 573–574
/tmp directory configuration files, 129
tmpwatch command, 816
tools. See system administration tools; text-based tools; and specific tools
Translation options (SELinux Management Tool), 715
troubleshooting, 728–766
about, 728
Apache errors, 472–473
boot failures, 144
boot loader, 749–750
booting into different runlevels, 733–735
cautions about removing RPM packages, 225
checking partitions with dumpe2fs, 754
configuration files, 162, 331
corrupted files, 755–756
desktop environments, 746
DHCP clients, 632
difficulties recognizing second network adapters, 336
DNS configuration files, 574
e2label command for filesystem, 753–754, 755
errors in GRUB configuration file, 152–155
exam objectives for, 728, 729
fdisk and parted utilities for, 752–753
filesystems, 747, 751–755
fsck command for, 754–755
graphics hardware during boot USB or CD/DVD installation, 91
GUI-text editors for exam, 11
hostname resolution, 744
identifying problems during, 728–733
inspecting system logs for problems, 364
installation, 127–129
IP addresses and NAT, 706
lab questions and answers on, 762–763, 765–766
linux rescue environment for, 728, 735–742
logical volumes, 756–759
module errors in boot loader, 750–751
network problems, 742–743
network service issues, 756, 759
new partitions, 747–748
NFS client hangs when shutting down, 503–504, 507–508
partitioning mistakes using parted, 191
remote X applications, 676–677
RHCT exam requirements for, 330, 742–748
scenarios and solutions for, 731–732
self test and answers, 761–762, 764–765
sendmail, 596–597
skills required for RHCE, 748–759
summarized, 759
swap partitions, 747
two-minute drill, 760
unable to open SELinux
Management Tool, 83
USB ports or PCI card from BIOS menus, 5
using command line or text-based tools for exam, 282, 748
yum command problems, 241
X clients and servers, 669
X Font Server, 674
X Window System, 666, 745
Troubleshooting and System Maintenance section
exam objectives for, 728, 729, 759
Sample Exam 1, 768–776
Sample Exam 2, 784–793
two-minute drills
X Window System, 683
Apache and Squid, 485
booting, 173–174
DNS, 578
filesystem administration, 211
hardware compatibility and installation, 131–132
kernels, 431–432
network file sharing services, 546–547
other networking services, 638–639
package management, 261–262
prerequisite skills, 57–60
security, 718–719
system administration tools, 365–366
troubleshooting, 760
user administration, 319–320