This PCNSE practice question tests your understanding of deploy and configure firewalls. 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.
By default, what is the action on traffic between two different zones without any security rule?
deny
By default, traffic between different zones is denied unless a security rule allows it.
allow
Why wrong: Intrazone traffic is allowed by default, but interzone traffic is denied.
depends on the application
Why wrong: Default action is deny regardless of application.
prompt
Why wrong: No prompt behavior exists for default interzone traffic.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
deny
By default, Palo Alto Networks firewalls implement an implicit deny rule for inter-zone traffic. This means that if no security rule explicitly matches traffic between two different zones, the firewall drops the packet and logs it as a deny action. This default behavior ensures that all cross-zone traffic must be explicitly allowed by a security policy, enforcing a zero-trust model.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
deny
Why this is correct
By default, traffic between different zones is denied unless a security rule allows it.
Related concept
Read the scenario before looking for a memorised answer.
allow
Why it's wrong here
Intrazone traffic is allowed by default, but interzone traffic is denied.
depends on the application
Why it's wrong here
Default action is deny regardless of application.
prompt
Why it's wrong here
No prompt behavior exists for default interzone traffic.
Common exam traps
The trap here is that candidates often confuse the default inter-zone action with intra-zone traffic (which is allowed by default) or assume that the firewall will prompt or log a warning, when in fact it silently denies without any user notification.
Detailed technical explanation
The implicit deny rule is part of the firewall's rulebase and is evaluated after all user-defined security rules. It has a priority of 0 (lowest) and matches any traffic that hasn't been permitted or explicitly denied. In a real-world scenario, if you create a new zone and move an interface into it without adding a security rule, all traffic to or from that zone will be dropped, which can cause unexpected outages if not planned for during migrations.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Deploy and Configure Firewalls — This question tests Deploy and Configure Firewalls — Read the scenario before looking for a memorised answer..
The correct answer is: deny — By default, Palo Alto Networks firewalls implement an implicit deny rule for inter-zone traffic. This means that if no security rule explicitly matches traffic between two different zones, the firewall drops the packet and logs it as a deny action. This default behavior ensures that all cross-zone traffic must be explicitly allowed by a security policy, enforcing a zero-trust model.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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.
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