- A
Create a decryption policy to decrypt all traffic.
Why wrong: Decryption does not interact with authentication enforcement.
- B
Use identity-based routing to enforce authentication.
Why wrong: Identity-based routing is for policy-based routing, not authentication.
- C
Enable user-ID on the ingress interface and configure authentication policy for IP addresses.
Why wrong: This is already assumed; the issue is that the existing authentication policy may not match the IP address range. More specific is needed.
- D
Configure an authentication policy with source user 'unknown' to enforce authentication for all unmapped IP addresses.
By default, authentication policies match on source user 'any', so if a user mapping exists, the policy applies. Setting source user to 'unknown' ensures that traffic from IPs without a user mapping triggers authentication.
PCNSE Practice Question: Securing Users and Applications with Authentication
This PCNSE practice question tests your understanding of securing users and applications with authentication. 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 security administrator notices that users are able to bypass authentication by accessing resources using IP addresses instead of FQDNs, even though authentication policies are configured. How can this be prevented?
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
Configure an authentication policy with source user 'unknown' to enforce authentication for all unmapped IP addresses.
Authentication policies match based on source zone, destination zone, and application. Using IP addresses does not bypass authentication if the application is correctly identified. However, if the destination IP is not covered by the authentication policy, users may slip through. Option D is correct: create a rule to enforce authentication for unmapped users.
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.
- ✗
Create a decryption policy to decrypt all traffic.
Why it's wrong here
Decryption does not interact with authentication enforcement.
- ✗
Use identity-based routing to enforce authentication.
Why it's wrong here
Identity-based routing is for policy-based routing, not authentication.
- ✗
Enable user-ID on the ingress interface and configure authentication policy for IP addresses.
Why it's wrong here
This is already assumed; the issue is that the existing authentication policy may not match the IP address range. More specific is needed.
- ✓
Configure an authentication policy with source user 'unknown' to enforce authentication for all unmapped IP addresses.
Why this is correct
By default, authentication policies match on source user 'any', so if a user mapping exists, the policy applies. Setting source user to 'unknown' ensures that traffic from IPs without a user mapping triggers authentication.
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 PCNSE NAT questions on configuration and troubleshooting.
- →
Securing Users and Applications with Authentication — study guide chapter
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Securing Users and Applications with Authentication practice questions
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FAQ
Questions learners often ask
What does this PCNSE question test?
Securing Users and Applications with Authentication — This question tests Securing Users and Applications with Authentication — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure an authentication policy with source user 'unknown' to enforce authentication for all unmapped IP addresses. — Authentication policies match based on source zone, destination zone, and application. Using IP addresses does not bypass authentication if the application is correctly identified. However, if the destination IP is not covered by the authentication policy, users may slip through. Option D is correct: create a rule to enforce authentication for unmapped users.
What should I do if I get this PCNSE 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 PCNSE 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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Last reviewed: Jun 24, 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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