Concept of Firewalls

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Definition:

A firewall is a software program or hardware device that protects networks from unauthorized data by blocking unsolicited traffic. Firewalls allow incoming or outgoing  that has specifically been permitted by a system administrator and incoming traffic that is sent in response to requests from internal systems. Firewalls use complex filtering algorithms that analyze incoming network data based on destination and source addresses, port numbers, and data type.

Example:

Firewalls

Software Firewalls

Software firewalls can be useful for small home offices and businesses. The firewall provides many features that can be configured to suit various computing needs. Some features include:

  • Enabling or disabling port security on certain ports.
  • Inbound and outbound filtering. The user can set up rules or exceptions in the firewall settings to limit access to the web.
  • Reporting and logging activity.
  • Malware and spyware protection.
  • Pop-up blocking.
  • Port assigning, forwarding, and triggering.

Hardware Firewalls

A hardware firewall is a hardware device, either stand-alone or built into most routers, that protects computers on a private network from unauthorized traffic. They are placed between the private network and the public network to manage inbound and outbound traffic and network access.

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