The answer is Rule 1: source-nat-1. This is correct because the workstation at 10.0.0.5 falls within the source range of 10.0.0.0/8 defined in Rule 1, and the destination 8.8.8.8 does not match the exception rule’s destination of 192.168.1.0/24, so the traffic hits Rule 1 first and its source IP is translated to the interface IP. On the PCNSA exam, this tests your understanding of how NAT rules match based on source and destination addresses in a top-down order, where the first matching rule is applied and no further rules are evaluated. A common trap is assuming multiple rules can match simultaneously, but Palo Alto firewalls enforce a first-match logic, so even if a later rule seems applicable, it is never reached. Memory tip: think of NAT rules like a bouncer at a door—the first guest (rule) that fits the description (source and destination) gets to act, and the rest are ignored.
PCNSA Securing Traffic Practice Question
This PCNSA practice question tests your understanding of securing traffic. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
admin@PA-500> show running nat-policy
Rules:
1. name: source-nat-1
source: 10.0.0.0/8
destination: any
service: any
source-translation: interface-ip-address (ethernet1/2)
action: dynamic-ip-and-port
2. name: no-nat-for-servers
source: 10.0.0.0/8
destination: 192.168.1.0/24
service: any
action: no-nat
A workstation at 10.0.0.5 sends traffic to destination 8.8.8.8. Which NAT rule will be applied?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rule 1: source-nat-1
Option A is correct because the traffic matches source range 10.0.0.0/8 and destination does not match the exception rule (8.8.8.8 is not 192.168.1.0/24), so rule 1 is applied and translates the source IP to the interface IP. Option B is wrong because the destination does not match rule 2. Option C is wrong because multiple matches not possible; first match wins. Option D is wrong because a rule matches.
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.
✗
Rule 2: no-nat-for-servers
Why it's wrong here
Destination 8.8.8.8 is not in 192.168.1.0/24.
✗
Both rules are applied.
Why it's wrong here
Only the first matching rule is applied.
✗
No NAT rule matches; traffic is not translated.
Why it's wrong here
Rule 1 matches.
✓
Rule 1: source-nat-1
Why this is correct
Rule 1 matches the source and destination, and since rule 2's destination does not match, rule 1 is applied.
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: Rule 1: source-nat-1 — Option A is correct because the traffic matches source range 10.0.0.0/8 and destination does not match the exception rule (8.8.8.8 is not 192.168.1.0/24), so rule 1 is applied and translates the source IP to the interface IP. Option B is wrong because the destination does not match rule 2. Option C is wrong because multiple matches not possible; first match wins. Option D is wrong because a rule matches.
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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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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