Index_U

U

UDP (User Datagram Protocol)

defined, 533

functions in TCP/IP, 62

UDP attacks, 72–74

defined, 72–73

ICMP attacks, 73

ICMP tunneling, 74

smurf attacks, 73–74, 74

UDP ports, 65–66

Uniform Resource Locators (URLs), 532

Uninterruptible Power Supply (UPS), 272, 532

UNIX

file systems for, 229

NFS, 173, 173, 229, 230, 519

OS/NOS hardening, 226–227

securing interactive users, 369–370

unshielded twisted pair (UTP) cables, 145–146, 145, 146, 532

updates

administrator’s responsibilities for, 477

keeping pace with security standards, 476–478

network device, 233–234

operating system, 231–233

hotfixes, 232, 511

patches, 232–233, 521

service packs, 232, 527

scheduling server, 473–474

updating from Microsoft Windows 9x to XP, 225

Windows NT 4 Service Pack 3, 231

UPS (Uninterruptible Power Supply), 272, 532

uptime, 532

URLs (Uniform Resource Locators), 532

usage auditing, 437–438

usage policies, 8, 462–463, 532

user-level security, 533

user management policies, 533

username/password authentication, 13, 13

users

backups of files, 411–412

communicating security issues to, 474–475

connecting remote network, 127

data, 291

defined, 533

educating, 475–476

helping recover from viruses, 190–191

management policies and procedures, 9, 465

notification of, 460

privilege management for, 432–433, 434

securing UNIX interactive, 369–370

UTP (unshielded twisted pair) cables, 145–146, 145, 146, 532