This PCNSE practice question tests your understanding of core concepts and architecture. 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.
Which THREE are valid methods for User-ID mapping in PAN-OS?
DHCP snooping
DHCP snooping maps IP addresses to MAC addresses which are linked to users via authentication.
Netflow collection
Why wrong: Netflow is used for traffic analysis, not User-ID.
SNMP traps
Why wrong: SNMP traps are not used for User-ID mapping.
Active Directory polling
AD polling retrieves user-to-IP mappings from domain controller logs.
Captive Portal
Captive Portal authenticates users and maps their IP addresses.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
DHCP snooping
DHCP snooping is a valid User-ID mapping method because the PAN-OS firewall can act as a DHCP snooping device, listening to DHCPACK messages from the DHCP server. By extracting the client IP address and MAC address from these packets, the firewall can map the IP to a username if the MAC is known via other means (e.g., Active Directory). This method is agentless and works well in environments where DHCP is used for IP address assignment.
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.
DHCP snooping
Why this is correct
DHCP snooping maps IP addresses to MAC addresses which are linked to users via authentication.
Related concept
Read the scenario before looking for a memorised answer.
Netflow collection
Why it's wrong here
Netflow is used for traffic analysis, not User-ID.
SNMP traps
Why it's wrong here
SNMP traps are not used for User-ID mapping.
Active Directory polling
Why this is correct
AD polling retrieves user-to-IP mappings from domain controller logs.
Related concept
Read the scenario before looking for a memorised answer.
Captive Portal
Why this is correct
Captive Portal authenticates users and maps their IP addresses.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse network monitoring protocols like Netflow and SNMP with user identification mechanisms, mistakenly thinking they can provide user-to-IP mappings when they are designed for traffic analysis and device management, respectively.
Detailed technical explanation
Under the hood, DHCP snooping on PAN-OS leverages the firewall's ability to intercept DHCP traffic at Layer 2, parsing the DHCPACK packet to extract the client's IP and MAC address. This mapping is then correlated with user information from other sources (e.g., AD polling or terminal services agent) to complete the user-IP binding. In a real-world scenario, this is particularly useful in networks with dynamic IP assignments where static IP-to-user mappings are impractical.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCNSE exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Core Concepts and Architecture — This question tests Core Concepts and Architecture — Read the scenario before looking for a memorised answer..
The correct answer is: DHCP snooping — DHCP snooping is a valid User-ID mapping method because the PAN-OS firewall can act as a DHCP snooping device, listening to DHCPACK messages from the DHCP server. By extracting the client IP address and MAC address from these packets, the firewall can map the IP to a username if the MAC is known via other means (e.g., Active Directory). This method is agentless and works well in environments where DHCP is used for IP address assignment.
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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