Firewall and network security – UGC NET Question

A firewall sits between a trusted internal network and untrusted external networks (like the Internet) and filters packets using security rules. Its main job is to allow legitimate traffic and block suspicious or unauthorised connections.

Option A:
This option correctly describes the core function of a firewall: inspecting traffic and enforcing access-control policies to protect campus systems.

Option B:
CPU speed is determined by hardware design and clock frequency; a firewall does not exist to “speed up” processors.

Option C:
Automatically deleting all user files would be destructive, not protective; this is not a firewall’s role.

Option D:
Converting analogue to digital signals is done by codecs or related devices in multimedia systems, not by firewalls.