What is firewall ?



What is firewall ?

  • A firewall is a piece of hardware or software that helps prevent malware and malicious attacks from entering a computer or a network of computers through the Internet.
  • Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.
  • A firewall can be hardware,software or both.

Hardware firewalls

  • Hardware firewalls are systems that are independent of the computers they protect that filter the Internet as information passes into a computer.
  • Most broadband Internet routers have their own firewall built in.
  • In general, hardware firewalls work by examining the data that flows in from the Internet and verifying whether that information is safe.
  • The ZyXEL ZyWALL, which is a Unified Security Gateway with a firewall and other security features.
  • Cost: $100 to ~$500
  • NAT, DCHP, Email Notification.
  • Easier for computers to locally share folders/Printers.
  • Additional function available & can protect other devices.
zyxel firewall

Hardware firewall

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Software firewalls

  • Software firewalls are designed to protect a computer by blocking certain programs from sending and receiving information from a local network or the Internet.
  • The Windows Firewall, an example of a firewall software program included with Microsoft Windows.
  • Cost: Free to $30 per computer.
  • Each machine need to be configured.
  • Firewall may be interfere with local network sharing.
Software firewall

Software firewall


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