This section focuses on the functions of key network devices and their mapping to the TCP/IP model.
Gateways
Gateways are network devices that act as bridges between two networks using different protocols. They translate data formats and ensure seamless communication between disparate systems.
Gateways operate primarily at the Application Layer of the TCP/IP model but can function across multiple layers depending on their specific role.
Firewalls
Firewalls are security devices that monitor and control network traffic based on predetermined rules. They act as a barrier between trusted and untrusted networks.
Firewalls primarily operate at the Internet Layer but can inspect data at the Transport and Application Layers in advanced configurations.
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Paywall
(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.
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