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Firewalls Checkpoint

In: Computers and Technology

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Firewalls

According to Regan (2004) firewall is a combination of hardware and software that serves as defense against external threats to a network system, a firewall’s task in a networked environment is to block communications not permitted by the security policy. Another function is to keep computer networks secure and safe by working as a barrier keeping destructive forces away from network systems. A firewall also controls traffic between different zones, typical the zones include an internal network, and the Internet.

The main three types of firewalls are; dynamic packet filter, circuit gateway, and application gateway firewall. Dynamic packet filter is a firewall that supervises active connections and it uses the information obtained to determine what network packets are allowed to be processed through the firewall. This is done by recording data such port numbers as well as IP addresses. The way dynamic packet filter protects the company’s network is by configuring its firewall when a company authorizes employees to access external Internet it is safe because it is configured to only allow reply to the user’s information request back in.

A Circuit Gateway firewall’s purpose is to configure a firewall to validate connections before data is exchanged. The Circuit Gateway functions at the OSI Model Transport Layer, the way in which traffic is filter mainly depends on specified session rules that are modified and allowed on specific computers. Using a Circuit Gateway firewall is beneficial to protect a network because the firewall hides the network from the outside preventing access to intruders. Last, the Application Gateway firewall functions as a messenger sitting between the Internet service and a user on an internal network, instead of the Internet directly communicating with the internal network both networks communicate to the gateway.

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