PCNSE Core Concepts and Architecture Practice Question
A security engineer needs to deploy a Palo Alto Networks firewall in a high-availability (HA) pair with active/passive mode. The firewall will inspect traffic for multiple tenants, each requiring separate routing and policy configuration. Which feature should be used to isolate tenant configurations while using a single pair of firewalls?
⚠ Common exam trap
Test-takers frequently confuse virtual routers (VRFs) with full tenant isolation, not realizing that VRFs only separate routing tables, while VSYS provides complete separation of policies, objects, and administration required for multi-tenant environments.
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 separate virtual systems (VSYS) for each tenant on the same firewall.
Virtual systems (VSYS) allow a single Palo Alto Networks firewall to be partitioned into multiple independent logical firewalls, each with its own routing table, security policies, and administrative domains. This enables tenant isolation on a single HA pair without requiring separate hardware or instances, making option A correct for the described requirement.
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 separate virtual systems (VSYS) for each tenant on the same firewall.
Why this is correct
Separate VSYS instances partition a single firewall into independent logical firewalls, each with its own routing table, zones, policies and administrator roles. This satisfies the multi-tenant isolation requirement while retaining one active/passive HA pair, since VSYS share the underlying hardware and failover state.
- ✗
Deploy multiple VM-Series firewalls as separate instances on the same hypervisor.
Why it's wrong here
Deploying multiple VM-Series instances on a single hypervisor does not isolate tenant configurations within a single HA pair; each VM-Series instance operates as an independent firewall with its own separate HA configuration, not as a shared chassis that enforces per-tenant routing and policy separation. This option is tempting because running separate firewall instances is a valid method for multi-tenant isolation in virtualised environments, and it would be the correct choice if the requirement were to deploy entirely independent firewalls per tenant rather than consolidating all tenants onto one active/passive HA pair.
- ✗
Use active/active HA mode to assign each tenant to a different firewall.
Why it's wrong here
Active/active HA shares one configuration across both peers, so it cannot give tenants separate routing and policy; the stem also specifies active/passive. It tempts because active/active suits load-sharing or asymmetric traffic flows, where both firewalls actively process sessions. Tenant isolation on one HA pair instead requires virtual systems, which partition routing and policy per tenant.
- ✗
Configure multiple virtual routers (VRFs) within the same virtual system.
Why it's wrong here
Multiple VRFs inside one virtual system still share that virtual system's management plane, policy rulebase and administrator context, so tenant isolation is incomplete. VRFs are tempting because they separate routing tables, which is exactly right when tenants need distinct routes but can safely share one policy set and admin domain.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNSE 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 PCNSE exam.