The correct answer is to create a security policy rule with the source zone from vsys1 and the destination zone from vsys2, with the action set to allow. This works because inter-vsys traffic is treated as inter-zone traffic by the Palo Alto firewall, meaning it must be explicitly permitted through a security policy that defines the source and destination zones belonging to different virtual systems. On the PCNSA exam, this concept tests your understanding that virtual systems are isolated by default, and traffic crossing between them is not automatic—it requires a deliberate policy rule. A common trap is assuming inter-vsys traffic is handled by a global setting or that it flows freely, but the firewall enforces the same zone-based security model across vsys boundaries. Remember the memory tip: "Cross vsys, cross zones—policy required."
PCNSA Securing Traffic Practice Question
This PCNSA practice question tests your understanding of securing traffic. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A firewall is configured with multiple virtual systems (vsys). An administrator wants to allow traffic from vsys1 to vsys2 while keeping other inter-vsys traffic blocked. How should this be accomplished?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a security policy rule with source zone from vsys1 and destination zone from vsys2, action allow.
Option C is correct because inter-vsys traffic is controlled by a security policy with source zone in vsys1 and destination zone in vsys2. Option A is wrong because inter-vsys rules exist, it's not automatic. Option B is wrong because there is no global setting. Option D is wrong because intra-vsys is within same vsys.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure intra-vsys security policy for each vsys and allow the traffic.
Why it's wrong here
Intra-vsys is within same vsys, not between.
✗
Enable inter-vsys traffic globally in the firewall settings.
Why it's wrong here
There is no global enable; it's done via policies.
✗
Traffic between vsys is automatically allowed.
Why it's wrong here
It is not automatically allowed; it's blocked by default.
✓
Create a security policy rule with source zone from vsys1 and destination zone from vsys2, action allow.
Why this is correct
Inter-vsys traffic is controlled by security policies using zones from different vsys.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSA NAT questions on configuration and troubleshooting.
Securing Traffic — This question tests Securing Traffic — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create a security policy rule with source zone from vsys1 and destination zone from vsys2, action allow. — Option C is correct because inter-vsys traffic is controlled by a security policy with source zone in vsys1 and destination zone in vsys2. Option A is wrong because inter-vsys rules exist, it's not automatic. Option B is wrong because there is no global setting. Option D is wrong because intra-vsys is within same vsys.
What should I do if I get this PCNSA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSA NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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