U

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uchg flag 2nd
UDP (User Datagram Protocol)
     in IP stack
     ports
     RADIUS use of
     WINS servers and
UFS (UNIX File System)
UID (user ID) 2nd
uid attribute, LDAP
uidNumber attribute, LDAP
umask command
unattended computers, securing
     Fast User Switching
     log out, after period of inactivity
     screen saver passwords
     sleep/screen saver passwords
UNIX
     crypt function
     detecting UNIX hacks
     features in Mac OS X
     file and folder permissions
     file permissions 2nd
     flags for protecting files
     monitoring commands
     RFC 2307 (UNIX)
     shell wildcards
     storing authentication and identification information in /etc directory
UNIX File System (UFS)
unmanaged networking. [See networks, unmanaged]
unmount command 2nd
unmounting volumes
updates
     local system security and
     performing security updates
     replication
     Web security and
Upgrade installations
upgrading Mac OS X servers
user accounts
     access control in
     administering access according to needs and skills
     Apple Directory plug-in
     create your account screen
     creating
     identification scenarios in multiple service realm
     Mac OS X security and
     mobile user accounts
     network user accounts
     types of
user authentication
     Active Directory plug-in
     third-party directory services
     with LDAPv3 plug-in
user community
User Datagram Protocol. [See UDP (User Datagram Protocol)]
user ID (UID) 2nd
user management, Kerberos
user mounting
user records
user shell, Active Directory plug-in
utilities
     Kerberos authentication
     Password Server