Premium Essay

Firewalls

In: Computers and Technology

Submitted By joshuagrail
Words 320
Pages 2
Checkpoint: Firewalls
IT/242
Your Name
A firewall is one of the main software features that are in a computer system or a network. The job of a firewall is to prevent unauthorized access from the outside while authorizing access that is permitted. Firewalls are mainly used to keep outside intruders from accessing the private networks.
There are several types of firewalls that are available for security. Firewall can be used for a home network, work network, and large business networks. The first level for a firewall is the packet filters. The packet filters can offer access and refuse access to any machines that are located within the network system and outside the network. It is also able to manage the direction of access the machine has. A firewall can control and allow incoming traffic as well as outgoing traffic. The second level is the application level gateway. The application level gateways are kept between the user that is on the Internet network and the service on the Internet. The next level of firewall is the circuit level gateway. The circuit level gateway functions on the transport level of the OSI model. The UDP and TCP are checked by the Circuit level gateways before attempting to make the connection. A proxy server is the last level of a firewall. This is used to intercept all of the messages that enter and leave the network system. The proxy server is able to conceal the true network addresses.
When it comes down to choosing which firewall will best serve ones purpose I believe that the packet filters are the best choice for a network. Due to the fact packet filters monitor each individual packet by itself. The packets filters do not look at any part of the traffic and when the packet does not pass the requirements by the firewall, the packet is removed.

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