Checkpoint - Firewalls Essay

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CheckPoint: Firewalls There are three major types of firewalls to consider when you are setting up your network. Depending on the kind of traffic, as well as what software will be used will determine what kind of firewalls you would want to put into place. The three major firewalls that are available are; Packet-Filtering firewall, stateful inspection firewalls and an Application-Level gateway. Packet-Filtering firewalls examine packets that are passing through the network to make sure that they are legit, and aloud to pass. This type of firewall is usually set up to filter packets that are going inbound as well as outbound. “The rules set on this information is; sources IP address, destination IP address, source and destination transport-level address as well as the IP protocol field. An interface is also included on this, but only if the firewall has more than three ports available” Chapter 9, Pg. 560. The stateful inspection firewall only focuses on packet transfers. “A stateful inspection packet firewall tightens up the rules for TCP traffic by creating a directory of outbound TCP connections” Chapter 9, Pg. 564. This makes transfers only possible on the ports that are available on the firewall, making them a tighter and harder place for people to slip into the network. Like the packet-filtering firewall, this firewall also reviews the packet information; but it also stores it. This allows for some tatics that are used by hackers to not be able to penetrate security and cause breaches. Application-Level gateways make the user enter passwords in-order to obtain an application across the network. If the information is not entered, the firewall will not let the application pass through. Application-Level gateways are more reliable then packet-filtering firewalls. Instead of dealing with combinations that are provided by the network, it can instead focus on

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