Palo Alto PCNSA Practice Test (Legacy – exam retired January 2025)

PCNSA practice test: what's covered

• Network Security Administrator
• PAN-OS 11

Free PCNSA sample questions

1. A new admin asks why the Palo Alto NGFW classifies traffic far faster than a stateful firewall doing deep inspection in stages. Which architecture component MOST directly enables a single pass over the packet for App-ID, User-ID, Content-ID and policy lookup?

   • A. Single Pass Parallel Processing (SP3) — one parse + parallel hardware-accelerated function blocks (Networking, Security, Content, Mgmt)
   • B. Stateful inspection chain that runs App-ID, then User-ID, then Content-ID sequentially per packet
   • C. The Management Plane offloading inspection to the Data Plane CPU only when needed
   • D. A round-robin DPDK pipeline across vCPUs
   Show answer

   Correct: A. SP3 is the PAN-OS marquee architecture: the packet is parsed ONCE, then App-ID / User-ID / Content-ID / policy lookup happen in parallel hardware-accelerated blocks. Option B is the classic misconception — students assume the engines run sequentially per packet. SP3 also separates the Management Plane from the Data Plane so management overhead does not interfere with throughput.

2. On a PAN-OS 11 firewall, two zones "Trust" (type Layer 3) and "DMZ" (type Layer 3) have no explicit Security Policy rules between them. Inter-zone traffic from Trust → DMZ is:

   • A. Allowed — Palo Alto allows all inter-zone traffic by default
   • B. Denied — the implicit intrazone-default ALLOWS same-zone traffic; the implicit interzone-default DENIES different-zone traffic
   • C. Allowed but logged via the implicit Any/Any/Allow rule
   • D. Denied only if Threat Prevention licence is missing
   Show answer

   Correct: B. PAN-OS has two implicit rules at the bottom of every policy: intrazone-default = ALLOW (same zone) and interzone-default = DENY (different zone). New admins frequently miss this and wonder "why is nothing working?" — you must explicitly create allow rules for traffic that crosses zones. You can also override the implicit rules to add logging.

3. Which TWO statements about the Palo Alto Zone construct are TRUE? (Choose 2)

   • A. A zone is a logical group of one or more interfaces of the SAME type (e.g., all L3 interfaces)
   • B. Security policy is enforced between zones — at least one zone must be the source and one the destination on every rule
   • C. Zones can mix Layer 2, Layer 3 and V-Wire interfaces freely
   • D. Zones are only used for QoS, never for security policy
   • E. A zone applies to a single physical interface only — you cannot have multiple interfaces per zone
   Show answer

   Correct: A and B. Zones group interfaces of the SAME type — you cannot mix L2/L3/V-Wire in one zone. Security policy is always evaluated zone-to-zone (or zone-to-itself for intrazone). Zones absolutely can contain multiple interfaces, and are also used by QoS and DoS but their primary role is segmentation for Security Policy.

4. Which statement BEST describes a Virtual System (vsys) on a PA-5450?

   • A. A vsys is a hardware blade that must be ordered separately
   • B. A vsys is a logical, separately-administered firewall instance sharing the same hardware but with its own zones, policies, address objects and admin role scope
   • C. A vsys is a per-interface VLAN tag for trunked sub-interfaces
   • D. A vsys is the management profile applied to an interface
   Show answer

   Correct: B. Virtual Systems are multi-tenant logical firewalls inside one physical chassis — used by MSSPs and large enterprises to separate business units. Each vsys has its own zones, address objects, security policy, and can be assigned to its own admin role. The hardware (data plane, dataplane CPU) is shared but per-vsys session and policy state are isolated.

5. A Security Policy rule has Service set to "application-default" and applications include "ssl, web-browsing". Which statement is TRUE?

   • A. The rule allows ssl and web-browsing on ANY port
   • B. The rule allows ssl ONLY on its application-default port (typically TCP/443) and web-browsing ONLY on TCP/80 — traffic on non-default ports is denied even if the App-ID matches
   • C. "application-default" means the rule accepts any TCP port up to 65535
   • D. application-default is purely cosmetic; behaviour is identical to "any"
   Show answer

   Correct: B. This is THE most-tested PCNSA misconception. "application-default" restricts allowed traffic to the IANA / Palo Alto-defined default port(s) per application. A web-browsing session on TCP/8443 will NOT match even though App-ID identifies it as web-browsing. Use "application-default" as a security best practice — it prevents evasive apps from tunnelling on non-standard ports.

Last updated: 2026-10-19

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