- A
Install a single centralized User-ID agent that polls all domain controllers across sites.
Why wrong: Incorrect: This generates excessive WAN traffic and creates a single point of failure.
- B
Use the built-in User-ID agent on each firewall and point it to local domain controllers.
Why wrong: Incorrect: Built-in agent is suitable for small deployments but not for large distributed environments due to processing load.
- C
Install one User-ID agent at each site, each configured to communicate only with the local firewall.
Why wrong: Incorrect: This provides no redundancy if an agent fails.
- D
Install multiple User-ID agents in a redundancy group, each serving multiple sites.
Correct: Reduces WAN traffic by having agents local to sites, and redundancy groups ensure continuity.
Quick Answer
The answer is to install multiple User-ID agents in a redundancy group, each serving multiple sites. This deployment is correct because it enables load balancing and failover across distributed enterprise firewalls, ensuring continuous user-to-IP mapping without a single point of failure. By configuring each agent to monitor specific domain controllers at different sites, you minimize unnecessary cross-site polling traffic while still providing redundant coverage—a critical balance for WAN efficiency. On the PCNSA exam, this scenario tests your understanding of User-ID agent redundancy deployment in distributed enterprises, often contrasting it with a single centralized agent (a common trap that creates a bottleneck and excessive WAN traffic). Remember the memory tip: “Many agents, many sites—no single point of frights.”
PCNSA Device Management and Services Practice Question
This PCNSA practice question tests your understanding of device management and services. 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 distributed enterprise has multiple firewalls at different sites. They want to map user IP addresses to usernames using the User-ID agent. The agent must be deployed in a way that minimizes unnecessary traffic and provides redundant coverage. What is the recommended deployment?
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
Install multiple User-ID agents in a redundancy group, each serving multiple sites.
Option D is correct because deploying multiple User-ID agents in a redundancy group allows load balancing and failover across sites, ensuring continuous user-to-IP mapping without a single point of failure. Each agent can be configured to monitor specific domain controllers, minimizing cross-site polling traffic while providing redundant coverage. This aligns with best practices for distributed enterprises where centralized polling would create unnecessary WAN traffic and a single agent would lack resilience.
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.
- ✗
Install a single centralized User-ID agent that polls all domain controllers across sites.
Why it's wrong here
Incorrect: This generates excessive WAN traffic and creates a single point of failure.
- ✗
Use the built-in User-ID agent on each firewall and point it to local domain controllers.
Why it's wrong here
Incorrect: Built-in agent is suitable for small deployments but not for large distributed environments due to processing load.
- ✗
Install one User-ID agent at each site, each configured to communicate only with the local firewall.
Why it's wrong here
Incorrect: This provides no redundancy if an agent fails.
- ✓
Install multiple User-ID agents in a redundancy group, each serving multiple sites.
Why this is correct
Correct: Reduces WAN traffic by having agents local to sites, and redundancy groups ensure continuity.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a single agent per site (Option C) is sufficient for redundancy, but fail to recognize that without a redundancy group, a single agent failure at a site completely breaks user mapping for that site, whereas a redundancy group provides automatic failover and load sharing.
Detailed technical explanation
How to think about this question
User-ID agents use the NetAPI (NetServerEnum2) or WMI to poll domain controllers for security event logs (e.g., event ID 4624 for logon) and map IP addresses to usernames. In a redundancy group, agents share the mapping database via XML over TCP port 5007, allowing seamless failover. The agent can also use probing (e.g., SMB, WMI) to verify user activity, but polling frequency must be tuned to avoid overwhelming domain controllers, especially in large environments with thousands of users.
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 practitioner preparing for the PCNSA 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
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.
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FAQ
Questions learners often ask
What does this PCNSA question test?
Device Management and Services — This question tests Device Management and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Install multiple User-ID agents in a redundancy group, each serving multiple sites. — Option D is correct because deploying multiple User-ID agents in a redundancy group allows load balancing and failover across sites, ensuring continuous user-to-IP mapping without a single point of failure. Each agent can be configured to monitor specific domain controllers, minimizing cross-site polling traffic while providing redundant coverage. This aligns with best practices for distributed enterprises where centralized polling would create unnecessary WAN traffic and a single agent would lack resilience.
What should I do if I get this PCNSA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 25, 2026
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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