Firewall
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.”
Usage Examples
- 1
“The team applied firewall best practices to improve their networking outcomes significantly.”
- 2
“Understanding firewall is essential for anyone building a career in IT & Technology.”
When & How to Use
Use 'Firewall' when working in Networking contexts where a firewall is a network security device or software that monitors and controls incoming and outgoing network traffic according to predetermined security rules.
- ▸Applying firewall principles during a networking project or initiative
- ▸Explaining firewall to a junior team member or stakeholder unfamiliar with IT & Technology
- ▸Evaluating options or proposals using firewall as a decision-making criterion
Etymology & Origin
The term 'Firewall' derives from professional usage and entered IT & Technology professional usage as the field formalised in the 20th century.
History & Evolution
The concept of firewall has evolved alongside IT & Technology. Early practitioners relied on informal methods; structured approaches emerged with the professionalisation of networking in the mid-20th century. Today, firewall is a standard part of IT & Technology practice globally.
Synonyms
- network barrier
- traffic filter
- security gateway
- packet filter
Antonyms / Opposites
- open network
- unfiltered connection
Images
CC-licensed · free to useVideo
Related Terms
- network-security
- vpn
- intrusion-detection
- packet-filtering