- A
Create three zones: Web, App, DB. Create rules that allow only necessary protocols (e.g., HTTP/HTTPS from internet to Web, specific ports from Web to App, and specific ports from App to DB).
This follows least-privilege principles by allowing only required traffic between specific zones and ports.
- B
Create three zones: Web, App, DB. Allow all traffic from Web to App and App to DB, and block all other inter-zone traffic.
Why wrong: This does not restrict which specific services are allowed; it allows all traffic between the tiers, which may be too permissive.
- C
Place web servers in an untrust zone and app/database in a trust zone, then allow all traffic from trust to untrust.
Why wrong: This would allow database servers to initiate connections to the internet, which is not required.
- D
Place all servers in the same zone and use rules to allow traffic between them.
Why wrong: This would not provide segmentation because intra-zone traffic is allowed by default unless explicitly blocked.
Quick Answer
The correct answer is to create three zones—Web, App, and DB—and write inter-zone security policies that allow only the necessary protocols between each tier. This design is correct because it implements a least-privilege model using Palo Alto Networks zones, which enforce strict multi-tier segmentation by controlling traffic between each zone with granular application- and port-based rules. On the PCNSA exam, this scenario tests your understanding of zone-based security and the principle of zero trust, where each tier is isolated and only explicitly permitted traffic flows are allowed. A common trap is to place all servers in a single zone or to allow broad any/any rules between tiers, which defeats segmentation. Remember the memory tip: “three zones, three rules, least privilege rules”—each rule should only permit the specific ports and apps needed for that hop, from internet to Web, Web to App, and App to DB.
PCNSA Palo Alto Networks Platforms and Architecture Practice Question
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization is deploying a Palo Alto Networks firewall in a data center to segment traffic between three application tiers: web, app, and database. The web servers must be accessible from the internet, the app servers must only be reachable from the web servers, and the database servers must only be reachable from the app servers. Which security policy design best meets these requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create three zones: Web, App, DB. Create rules that allow only necessary protocols (e.g., HTTP/HTTPS from internet to Web, specific ports from Web to App, and specific ports from App to DB).
Option A is correct because it implements a least-privilege security model using Palo Alto Networks zones and granular application- and port-based rules. By creating separate zones (Web, App, DB) and explicitly allowing only the necessary protocols (e.g., HTTP/HTTPS from the internet to Web, specific ports from Web to App, and specific ports from App to DB), the firewall enforces strict segmentation and minimizes the attack surface. This design leverages the zone-based security paradigm of PAN-OS to control inter-zone traffic precisely, aligning with the principle of zero trust.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create three zones: Web, App, DB. Create rules that allow only necessary protocols (e.g., HTTP/HTTPS from internet to Web, specific ports from Web to App, and specific ports from App to DB).
Why this is correct
This follows least-privilege principles by allowing only required traffic between specific zones and ports.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create three zones: Web, App, DB. Allow all traffic from Web to App and App to DB, and block all other inter-zone traffic.
Why it's wrong here
This does not restrict which specific services are allowed; it allows all traffic between the tiers, which may be too permissive.
- ✗
Place web servers in an untrust zone and app/database in a trust zone, then allow all traffic from trust to untrust.
Why it's wrong here
This would allow database servers to initiate connections to the internet, which is not required.
- ✗
Place all servers in the same zone and use rules to allow traffic between them.
Why it's wrong here
This would not provide segmentation because intra-zone traffic is allowed by default unless explicitly blocked.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume that allowing 'all traffic' between tiers is sufficient for segmentation, overlooking the critical security requirement of least privilege and the need to restrict traffic to only necessary protocols and ports.
Detailed technical explanation
How to think about this question
In PAN-OS, zones are logical groupings of interfaces that enforce security boundaries; inter-zone traffic is denied by default unless an explicit security rule allows it. The recommended design uses App-ID and Service/Port objects to identify and permit only specific applications (e.g., SSL for HTTPS, MySQL for database queries), ensuring that even if a port is open, only the intended application can traverse the firewall. In a real-world scenario, this approach prevents an attacker who compromises the web server from using non-standard ports to pivot to the app or database tiers, as only pre-approved protocols are allowed.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
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FAQ
Questions learners often ask
What does this PCNSA question test?
Palo Alto Networks Platforms and Architecture — This question tests Palo Alto Networks Platforms and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create three zones: Web, App, DB. Create rules that allow only necessary protocols (e.g., HTTP/HTTPS from internet to Web, specific ports from Web to App, and specific ports from App to DB). — Option A is correct because it implements a least-privilege security model using Palo Alto Networks zones and granular application- and port-based rules. By creating separate zones (Web, App, DB) and explicitly allowing only the necessary protocols (e.g., HTTP/HTTPS from the internet to Web, specific ports from Web to App, and specific ports from App to DB), the firewall enforces strict segmentation and minimizes the attack surface. This design leverages the zone-based security paradigm of PAN-OS to control inter-zone traffic precisely, aligning with the principle of zero trust.
What should I do if I get this PCNSA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 11, 2026
This PCNSA practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNSA exam.
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