The correct interpretation is that the log indicates an intrusion was detected and dropped. This is because the Palo Alto Networks firewall logs a threat ID with a severity of 'critical' and an action of 'drop' or 'block', which specifically records an intrusion prevention system (IPS) event where the threat was identified and the session was terminated, preventing the attack from reaching the target. On the PCNSA exam, this type of question tests your ability to read a threat log and distinguish between actions like 'alert', 'allow', or 'drop'—a common trap is confusing a 'drop' action with an 'alert-only' event, which would not have stopped the traffic. To remember, think of the mnemonic "Drop the Drop" — if the action column says 'drop', the packet was dropped, not just logged.
PCNSA Device Management and Services Practice Question
This PCNSA practice question tests your understanding of device management and services. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An intrusion was detected and dropped.
The log shows a threat ID (e.g., 12345) with a severity of 'critical' and an action of 'drop' or 'block', indicating that the firewall detected an intrusion attempt and dropped the packet. Option D is correct because the log specifically records an intrusion prevention system (IPS) event where the threat was identified and the session was terminated, preventing the attack from reaching the target.
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.
✗
A file transfer was blocked.
Why it's wrong here
Type is threat, not file.
✗
An intrusion was detected and allowed.
Why it's wrong here
Action is drop, not allow.
✗
A URL filtering event occurred.
Why it's wrong here
Subtype is intrusion, not url.
✓
An intrusion was detected and dropped.
Why this is correct
Threat log with action drop indicates intrusion dropped.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Palo Alto Networks often tests the distinction between 'allowed' and 'dropped' actions in threat logs, where candidates mistakenly assume that any detected intrusion is automatically dropped, but the action field must be explicitly checked to confirm the firewall's response.
Detailed technical explanation
How to think about this question
Under the hood, the Palo Alto Networks firewall uses a single-pass architecture where the Threat Prevention engine processes traffic through signatures for vulnerabilities, exploits, and malware. When a packet matches a vulnerability protection signature (e.g., from the WildFire or Threat Prevention subscription), the firewall can take actions such as 'drop', 'reset-both', or 'block-ip', which are recorded in the threat log with the specific threat ID and severity. In real-world scenarios, this log entry would be critical for incident response, as it confirms the firewall successfully prevented a known exploit (e.g., CVE-2021-44228) from compromising a server.
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.
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: An intrusion was detected and dropped. — The log shows a threat ID (e.g., 12345) with a severity of 'critical' and an action of 'drop' or 'block', indicating that the firewall detected an intrusion attempt and dropped the packet. Option D is correct because the log specifically records an intrusion prevention system (IPS) event where the threat was identified and the session was terminated, preventing the attack from reaching the target.
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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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.
Question Discussion
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