Complete the statement. A security profile can block or allow traffic____________

In the Palo Alto Networks firewall's order of operations, traffic is first evaluated against Security Policy rules. A Security Profile (e.g., Antivirus, Anti-Spyware, Vulnerability Protection) is a content inspection mechanism that is only applied to traffic that has been explicitly permitted by a Security Policy rule with an "allow" action. If the policy action is "deny" or "drop," the session is terminated, and no further inspection by Security Profiles occurs. Therefore, a profile's ability to block or allow is contingent upon the traffic first being matched and allowed by a parent Security Policy.

A. on unknown-tcp or unknown-udp traffic: This is too specific. Security Profiles can be applied to any type of allowed traffic, not just unknown protocols.
C. before it is matched by a security policy: This is incorrect. The Security Policy lookup is the primary enforcement point that must occur before any content inspection from a profile.
D. after it is matched by a security policy that allows or blocks traffic: This is incorrect because Security Profiles are never applied to traffic that is matched by a Security Policy rule with a "block" (deny/drop) action. ---

1. Palo Alto Networks

PAN-OS® Administrator’s Guide

Version 10.2 (2021).

Section: Security Policy

Page/Content: In the "Security Policy Actions" subsection

it states

"If the security policy rule that the traffic matches has an action of Allow

the firewall then applies the appropriate security profiles to the traffic to protect against viruses

spyware

and other threats." This directly confirms that profiles act only on allowed traffic.

2. Palo Alto Networks

PAN-OS® Administrator’s Guide

Version 10.2 (2021).

Section: Packet Flow Sequence in PAN-OS

Page/Content: The packet flow diagram and description for the "slowpath" (new session) clearly show that the "Security policy lookup" occurs first. If the action is "allow

" the flow proceeds to "Content inspection

" which is where Security Profiles are applied. If the action is "deny

" the packet is discarded

and no content inspection takes place.

3. Palo Alto Networks Education Services

"Firewall 10.2 Essentials: Configuration and Management (EDU-210)" Courseware.

Module: Securing Traffic with Security Policies

Content: The course material explicitly teaches that Security Profiles are components attached to Security Policy rules with an "allow" action to perform advanced inspection. The fundamental logic is that the policy makes the initial access decision

and the profile inspects the content of what is allowed.