Discussion
What is the purpose of a firewall in cyber security ?
Answer: B
A firewall exists to block unauthorized access to a network.
A firewall, in hardware or software, sits between a trusted network and untrusted ones such as the internet. It examines incoming and outgoing traffic against a set of rules, allowing permitted connections and blocking the rest, so that intruders and unwanted traffic are kept out.
Allowing unrestricted access is the opposite of a firewall's purpose. Making backups of data is the job of backup systems, not firewalls, so 'None of the above' is wrong as well.
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