00443nam a22001217a 4500020002100000082001500021100000900036245005100045260003600096300003100132500002000163650013800183  a8120324102 (pbk)  a004.6bBAS  aNIIT  aBasics of network security, firewalls and VPNs  aNew DelhibPrentice-Hall c2003  ax, 294 p.b: ill.c; 23 cm  aIncludes index.  aComputer scienceaNetwork securityvComputer securityvFirewallsvNetwork firewallvVPNvOperating systemsvFirewall ArchitecturevFC