Discussion
Which of the following is a network security system that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies ?
Answer: C
The system is a firewall.
A firewall, in hardware or software, stands between a trusted internal network and untrusted networks such as the internet. It inspects incoming and outgoing traffic and allows or blocks it according to the organisation's security rules.
A modem converts digital data to signals for transmission over telephone or cable lines, a repeater regenerates a weakening signal to extend a network's reach, and a scanner digitises paper documents. None of them filters traffic by security policy.
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