CompTIA CASP+ Practice Test 2026 - Free CASP+ Practice Questions and Study Guide

To enable VNC (Virtual Network Computing) access according to firewall rules, adding a new firewall rule is the appropriate action. Firewalls operate by filtering traffic based on rules specified by an administrator. If VNC access is not currently allowed, it typically means that either the specific port for VNC (usually TCP port 5900 for the default display) is not opened, or there isn't a rule permitting traffic for that protocol.

By adding a new firewall rule specifically allowing the necessary VNC traffic, you are directly configuring the firewall to permit incoming and/or outgoing connections that utilize that protocol. This targeted approach ensures that the firewall remains secure while allowing the necessary functionality for VNC access.

Modifying existing rules, removing them, or changing the default deny policy could lead to potential security risks or disruption of other services, which is why simply adding a specific rule is the best practice for enabling VNC access while maintaining overall security principles.