a) Virtual Firewall
     - Permits or denies traffic in accordance to the security        policy on a shared firewall appliance

b) Dedicated Firewall
     - Permits or denies traffic in accordance to the security
       policy on an individual firewall appliance

c) Antivirus
     - Protects the file servers against virus attacks

d) Intrusion Detection and Prevention Services
     - An enhanced network security solution that examines
       incoming network data for malicious traffic