Papers > Technology > What is a firewall and how does it work
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What is a firewall and how does it work
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How Firewalls Work and a Comparative of Desktop Firewalls
Firewalls are an area of increasing interest for people who are connected to the Internet and are even finding applications on private network to provide enhanced security. ...
A firewall protects networked computers from intentional hostile intrusion that could compromise confidentiality or result in data corruption or denial of service. ... A firewall sits at the junction point or gateway between the two networks, usually a private network and a public network such as the Internet. ... The term firewall comes from the fact that by segmenting a network into different physical subnet works, they limited the damage that could spread from one subnet to another just like fire doors or firewalls.
A simple firewall may just check the port and either block the packet or allow it through. ... A firewall cannot prevent individual users with modems from dialing into or out of the network, bypassing the firewall altogether. ...
Anyone who is responsible for a private network that is connected to a public network needs firewall protection. Furthermore, anyone who connects so much as a single computer to the Internet via modem should have personal firewall software. ... Dial up users who have been victims of malicious attacks and who have lost entire days of work, perhaps having to reinstall their operating system, know that this is not true. ... A firewall may allow all traffic through unless it meets certain criteria, or it may deny all traffic unless it meets certain criteria. The type of criteria used to determine whether traffic should be allowed through varies from one type of firewall to another. ... How a firewall determines what traffic to let through depends on which network layer it operates at.
These rules are the key to how firewalls work. ... Each of those bits of information serves as a filter item for firewall rules. If one of the monitored attributes triggers a rule the firewall acts according to the rule’s associated action. ... If a packet does not trigger any rule, the default action of the firewall will take over.
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Paper Information
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Title: What is a firewall and how does it work
Words: 1701
Rating: None
Pages: 6.8
submitted by: los968
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