It is useful to speedup internet access (Accelerator) and to protect private network from public
network(Firewall). It is actually firewall & acts as a proxy as well.

Types of firewalls:

  • Hardware firewall
  • Software firewall

Hardware firewall:

  • CISCO Pix
  • Watch Guard
  • Multi com Ethernet II

Software firewall:


  • ISA server
  • Checkpoint
  • Smooth wall

Firewall: A firewall protects networked computers from international hostile intrusions.