Firewall (computing): Difference between revisions

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}}</ref> their basic function being to control the flow of data between connected networks. They are either a [[software appliance]] running on general-purpose hardware, a [[Computer appliance#Types of appliances|hardware appliance]] running on special-purpose hardware, or a [[virtual appliance]] running on a virtual host controlled by a [[hypervisor]]. Firewall appliances may also offer non-firewall functionality, such as [[DHCP]]<ref>{{Cite web|title = Firewall as a DHCP Server and Client|url = https://paloaltonetworks.com/documentation/70/pan-os/pan-os/networking/firewall-as-a-dhcp-server-and-client.html|website = Palo Alto Networks|access-date = 2016-02-08}}</ref><ref>{{Cite web|title = DHCP|url = http://www.shorewall.net/dhcp.htm|website = www.shorewall.net|access-date = 2016-02-08}}</ref> or [[VPN]]<ref>{{Cite web|title = What is a VPN Firewall? – Definition from Techopedia|url = https://www.techopediavpnranks.com/definition/30753/vpn-firewall|website = Techopedia.comVPNRanks|access-date = 2016-02-08}}</ref> services. Host-based firewalls are deployed directly on the [[Host (network)|host]] itself to control network traffic or other computing resources.<ref>{{cite book | first1=John R. | last1=Vacca | title=Computer and information security handbook | publisher=Elsevier | date=2009 | ___location=Amsterdam | page=355 | isbn=9780080921945}}</ref><ref>{{cite web |url=https://personalfirewall.comodo.com/what-is-firewall.html |title= What is Firewall?|access-date=2015-02-12}}</ref> This can be a [[daemon (computing)|daemon]] or [[Windows service|service]] as a part of the [[operating system]] or an [[endpoint security|agent application]] for protection.

[[File:Firewall.png|thumb|left|An illustration of a network-based firewall within a network]]