A new firewall has been places into service at an organization. However, a configuration has not been entered on the firewall. Employees on the network segment covered by the new firewall report…

An unconfigured firewall, by default, applies an implicit "deny all" rule at the end of its rule set, blocking all traffic. To resolve the network access issue, the firewall must be explicitly configured with rules that permit the necessary user traffic, which prevents that traffic from being caught by and denied by the implicit deny rule.

While configuring access lists is the common method to allow traffic through a firewall, option A more accurately describes the fundamental principle being addressed: overriding the firewall's default implicit deny behavior.

Port security is a Layer 2 switch feature designed to restrict devices on a port, not a firewall function for filtering network traffic between segments.

Configuring an explicit deny rule would further restrict network access, exacerbating the problem where users are already unable to access the network due to the firewall's default implicit deny.