PCNSE Deploy and Configure Firewalls Practice Question
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.
An administrator wants to ensure that all traffic from the internal network to the internet uses a specific public IP address for source NAT. There are multiple public IP addresses available. What is the best way to achieve this?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a dynamic IP and port (DIPP) NAT policy with the specific IP as translated address
Option C is correct because a Dynamic IP and Port (DIPP) NAT policy allows you to specify a single translated address (the specific public IP) while still performing port address translation (PAT) to handle multiple internal sessions. This ensures all outbound traffic uses that exact public IP, unlike a pool which would distribute across multiple IPs. DIPP is the standard method for source NAT with a single IP when many internal hosts need concurrent internet access.
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.
✗
Configure a NAT IP pool
Why it's wrong here
An IP pool uses multiple addresses, not a single specific one.
✗
Use a static NAT policy
Why it's wrong here
Static NAT maps a specific internal IP to a specific public IP, not suitable for all traffic.
✓
Create a dynamic IP and port (DIPP) NAT policy with the specific IP as translated address
Why this is correct
DIPP NAT can use a specific public IP address for source NAT.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
The trap here is confusing a NAT IP pool (which distributes traffic across multiple IPs) with a DIPP policy that uses a single IP, leading candidates to incorrectly select option A or D when the requirement is to use a specific single public IP.
Detailed technical explanation
How to think about this question
Under the hood, DIPP (also known as NAPT or PAT) uses a single IP address and multiplexes sessions by modifying the source port, with the session table tracking each unique (source IP, source port, destination IP, destination port) tuple. In Palo Alto firewalls, the translated address in a DIPP policy can be a single IP or an IP range; specifying a single IP ensures all traffic egresses with that address, while the firewall automatically handles port allocation from the ephemeral range (1024-65535 by default). A real-world scenario is a company with a single public IP on their internet circuit that must NAT thousands of internal users—DIPP is the only scalable solution.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deploy and Configure Firewalls — This question tests Deploy and Configure Firewalls — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a dynamic IP and port (DIPP) NAT policy with the specific IP as translated address — Option C is correct because a Dynamic IP and Port (DIPP) NAT policy allows you to specify a single translated address (the specific public IP) while still performing port address translation (PAT) to handle multiple internal sessions. This ensures all outbound traffic uses that exact public IP, unlike a pool which would distribute across multiple IPs. DIPP is the standard method for source NAT with a single IP when many internal hosts need concurrent internet access.
What should I do if I get this PCNSE 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.
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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.
Question Discussion
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