BharatNotes Firewall
noun; also verb (transitive)Usage in a UPSC answer
A credible regulatory architecture must erect a firewall between the executive arms of the State and the institutions meant to audit them, so that the autonomy of bodies like the CAG and the Election Commission is not eroded by political expediency.
Synonyms
Antonyms
Word Family
firewall (n/v), firewalled (adj), firewalling (v pres.p)
Root
Coined/Modern: English compound fire + wall; computing metaphor for network security barrier (c. 1990)
Etymology
Compound of English fire + wall, originally referring to a fireproof barrier used to prevent the spread of fire in buildings (earliest use in the late 16th century); the computing sense emerged around 1990 as a metaphor for network security.
Memory Hook
Picture a literal wall of fire that nothing hostile can cross — a "fire + wall" that contains danger on one side and keeps your domain safe on the other.
How This Word Works in UPSC Writing
A system that filters network traffic according to configured rules, forming a controlled boundary between a trusted network and an untrusted one. Its place in security thinking is best understood through what it does not do, since the firewall belongs to a perimeter model which assumes a defensible boundary with threats outside and trust within, and that assumption has largely collapsed. Remote working, cloud services and mobile devices mean there is no single perimeter left to defend; insider threats originate within; and phishing works precisely by inducing someone inside to open a connection outward, which a firewall permits because the traffic is outbound and requested. The successor approach is zero trust, which abandons the idea of a trusted interior and authenticates and authorises every request regardless of origin. Defence in depth is the related principle that no single control should be relied on, so a firewall is one layer among several rather than a boundary wall.
Don’t Confuse It With
A firewall filters traffic at a network boundary according to rules, while an intrusion detection system watches for suspicious activity and reports it and an intrusion prevention system additionally blocks. An air gap physically isolates a network with no connection at all, which is stronger but far less usable. Zero trust is the architectural approach that abandons the assumption of a trusted interior. Defence in depth is the principle of layering controls so that the failure of one does not expose everything.
Hindi Meaning
फ़ायरवॉल; सुरक्षा दीवार (surakshā dīvār) descriptively.
Common Questions
- Why is the perimeter model of security considered outdated?
- Because cloud services, remote work and mobile devices leave no single boundary to defend, insiders operate within it, and phishing induces trusted users to open outbound connections a firewall permits.
- What is zero trust?
- An approach that treats no part of the network as inherently trusted, authenticating and authorising every request regardless of whether it originates inside or outside.
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