Firewall (computing)

In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on configurable security rules.^[1]^[2] A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet^[3] or between several VLANs. Firewalls can be categorized as network-based or host-based.

^ Boudriga, Noureddine (2010). Security of mobile communications. Boca Raton: CRC Press. pp. 32–33. ISBN 978-0849379420.
^ Macfarlane, Richard; Buchanan, William; Ekonomou, Elias; Uthmani, Omair; Fan, Lu; Lo, Owen (2012). "Formal security policy implementations in network firewalls". Computers & Security. 31 (2): 253–270. doi:10.1016/j.cose.2011.10.003.
^ Oppliger, Rolf (May 1997). "Internet Security: FIREWALLS and BEYOND". Communications of the ACM. 40 (5): 94. doi:10.1145/253769.253802. S2CID 15271915.

[1] Boudriga, Noureddine (2010). Security of mobile communications. Boca Raton: CRC Press. pp. 32–33. ISBN 978-0849379420.

[2] Macfarlane, Richard; Buchanan, William; Ekonomou, Elias; Uthmani, Omair; Fan, Lu; Lo, Owen (2012). "Formal security policy implementations in network firewalls". Computers & Security. 31 (2): 253–270. doi:10.1016/j.cose.2011.10.003.

[Oppliger_1997_94-3] Oppliger, Rolf (May 1997). "Internet Security: FIREWALLS and BEYOND". Communications of the ACM. 40 (5): 94. doi:10.1145/253769.253802. S2CID 15271915.

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