Palo Alto PCNSE Practice Test (Legacy – exam retired July 2025)

PCNSE practice test: what's covered

• Network Security Engineer
• PAN-OS 11

Free PCNSE sample questions

1. In the Single-Pass Parallel Processing (SP3) architecture, App-ID, User-ID, Content-ID and decryption execute:

   • A. App-ID, User-ID, Content-ID, and decryption run together after one parse of the packet.
   • B. Each inspection engine parses the packet again and finishes before the next engine starts.
   • C. The firewall buffers the whole session first, and App-ID, User-ID, Content-ID, and decryption start after that.
   • D. The firewall inspects the first packet, and later packets skip decryption, User-ID, and Content-ID.
   Show answer

   Correct: A. App-ID, User-ID, Content-ID, and decryption run together after one parse of the packet. SP3 = single packet parse, parallel inspection (App-ID/User-ID/threat/URL/content) in one trip. This is the throughput advantage versus serial UTM chains.

2. Which order matches slow-path session setup on PAN-OS?

   • A. Ingress, NAT policy lookup, session lookup, security policy check, then PBF/route lookup.
   • B. Ingress, App-ID, session lookup, security policy check, then NAT policy lookup.
   • C. Ingress, session lookup, PBF/route lookup, NAT policy lookup, then security policy check.
   • D. Ingress, security policy check, session lookup, PBF/route lookup, then NAT policy lookup.
   Show answer

   Correct: C. Ingress, session lookup, PBF/route lookup, NAT policy lookup, then security policy check. On a new session the firewall takes the packet at ingress, looks up the session, then does PBF or the route lookup so the egress zone is known. NAT policy runs after that route lookup, because NAT needs the egress zone, and the security policy check follows.

3. A Security policy hits an "application-default" service entry. What does that mean?

   • A. Application-default matches every port, including ports outside the list Palo Alto publishes for that App-ID.
   • B. Application-default matches only the default ports Palo Alto publishes for that App-ID.
   • C. Application-default matches any port on which that application has already been observed.
   • D. Application-default matches only custom ports created under Objects, Services.
   Show answer

   Correct: B. Application-default matches only the default ports Palo Alto publishes for that App-ID. application-default uses the ports Palo Alto publishes for that App-ID, not the IANA well-known list. Traffic on any other port misses the rule.

4. You need to insert a NGFW into a path that uses no routing/MAC changes and minimal redesign. Which deployment mode fits?

   • A. Layer 3 mode places each port in a zone and forwards this path through a virtual router.
   • B. Tap mode inspects the live frames on the wire and forwards each frame to the next hop.
   • C. Layer 2 mode bridges the VLAN between two zones and switches frames using its MAC table.
   • D. Virtual wire bonds the two ports as an inline pair and forwards the original frames with their original IP and MAC.
   Show answer

   Correct: D. Virtual wire bonds the two ports as an inline pair and forwards the original frames with their original IP and MAC. V-Wire bonds two physical ports as a transparent inline pair — same broadcast domain, no MAC/IP change. Common for in-line insertion without re-architecting.

5. Active/Active HA is preferred over Active/Passive when:

   • A. Active/Passive already shares sessions across both peers, so it is the pair to keep.
   • B. Active/Active lets the unlicensed peer forward while one member holds the licenses.
   • C. Both members forward traffic, and the pair owns asymmetric sessions across the two peers.
   • D. Active/Passive needs a live Panorama link, so Active/Active is the mode that forwards while Panorama is down.
   Show answer

   Correct: C. Both members forward traffic, and the pair owns asymmetric sessions across the two peers. A/A handles asymmetric flows via session-owner / session-setup roles and scales throughput. Operationally heavier — only choose when A/P throughput is a real constraint.

Last updated: 2026-10-19

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