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Perimeter Defenses

  • Perimeter Defenses include firewalls and screening routers, as well as access control mechanisms, such as Secure Shell (ssh), Kerberos and S/Key one-time encryption algorithms. The goal of perimeter defenses is to keep the bad guys out. Disabling or limiting unneeded or dangerous services (NFS, NETBIOS, RPC, etc)
  • For network security, this would also include inter-host communications, and trust models.