COMPUTER SYSTEMS AND NETWORK SECURITY:

 - securing computer networks from external attacks:
       dedicated firewalls (software and hardware),
       network traffic monitoring;
 - securing of specific hosts and services:
       firewall applications,
       service status monitoring,
       host operating system integrity monitoring,
       service output information integrity monitoring;
 - securing computer networks from inside attacks:
       network traffic monitoring,
       egress firewalls,
       egress traffic monitoring,
       egress application level monitoring and filtering,
       network scanning;
 - e-mail traffic monitoring and filtering:
       spam blocking,
       anti-virus filtering.