    /etc/fstab    /usr    (). 
     ,    -
  . :

/dev/hda6      /usr         ext2      ro          00

    ,  / /usr nosuid,   -
  setuid-    . :

/dev/hda4      /var         ext3      nosuid      0     
/dev/hda5      /usr/local   ext3      nosuid           

          Internet.
     : 
. security, firewalls  Web-   www.freefire.org.
  Red Hat Linux   iptables (.  25),  
 .

 

    .       -
        (  ) 
/etc/hosts .equiv   ~/ .rhosts  .    -
   IPSec  VPN  .    -
       .
    .  URL-   . B.I.

        
  (Intrusion Detection Systems  IDS),    
   . IDS     -
    ,   . "" -
    tripwire. ,   ,
         -
  (    ), -
      . 
   tripwire.    IDS 
DragonSquire.   ,    IDS  samhain  AIDE.
         
  ,  tripwire.    
   IDS: Cisco Secure IDS ( NetRanger),
Enterasys Dragon  ISS RealSecure.

    Fedora,     -
 .   .  :

fedora.redhat.corn/download/updates.html

  Red Hat Network (RHN), yum  Apt (.  13)  
       -
,        , 
   .

        
    .    -

 .                                                 943