Section: IT & Technology · NetworkingDifficulty: Easy
Firewall
USUK
A network security system that monitors and controls incoming and outgoing network traffic based on rules.
Definition
A firewall is a network security device or software that monitors and controls incoming and outgoing network traffic according to predetermined security rules. It establishes a barrier between a trusted internal network and untrusted external networks, such as the internet. Firewalls can be hardware-based, software-based, or a combination, and they operate using packet filtering, stateful inspection, or application-layer filtering techniques.
Example
“A company firewall blocked an employee's attempt to access a known malicious website by comparing the domain against its blacklist.”
Synonyms
- network barrier
- traffic filter
- security gateway
- packet filter
Antonyms / Opposites
- open network
- unfiltered connection
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Related Terms
- network-security
- vpn
- intrusion-detection
- packet-filtering