The answer is a Zone Protection Profile and a DoS Protection Profile. Both features can terminate sessions that are explicitly allowed by a security policy when they detect malicious behavior or threshold violations. A DoS Protection profile drops sessions when traffic rates or concurrent connection counts exceed configured limits, overriding the allow action to mitigate attacks. Similarly, a Zone Protection profile enforces flood protection, reconnaissance protection, and packet-based attack safeguards at the zone level, which can also cause a traffic drop despite an allow policy. On the PCNSE exam, this tests your understanding of how Palo Alto Networks firewalls prioritize threat mitigation over policy enforcement—a common trap is assuming an allow policy guarantees session completion. Remember the mnemonic “DZ Override”: DoS and Zone profiles override security policy allows when thresholds are breached.
PCNSE Core Concepts and Architecture Practice Question
This PCNSE practice question tests your understanding of core concepts and architecture. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 engineer is troubleshooting a traffic drop issue on a Palo Alto Networks firewall. The traffic is allowed by the security policy, but the session is being terminated. Which two features could cause this behavior? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DoS Protection
A DoS Protection profile can terminate sessions that exceed configured thresholds for rate, connection count, or other attack-related criteria, even if the security policy explicitly allows the traffic. When the firewall detects that a session matches a DoS Protection rule and the traffic rate or concurrent session count surpasses the defined threshold, it will drop the session to mitigate the attack, overriding the allow action from the security policy.
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.
✓
DoS Protection
Why this is correct
DoS Protection can actively terminate sessions exceeding thresholds.
Related concept
Read the scenario before looking for a memorised answer.
✗
User-ID
Why it's wrong here
User-ID maps users to IPs and does not drop traffic.
✗
SSL Decryption
Why it's wrong here
SSL Decryption does not drop traffic; it decrypts or bypasses.
✗
URL Filtering
Why it's wrong here
URL Filtering blocks based on URL category but does not terminate existing sessions.
✓
Zone Protection Profile
Why this is correct
Zone Protection can drop traffic based on flood protection or packet-based attacks.
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 only security policy rules control traffic flow, forgetting that additional security features like DoS Protection and Zone Protection Profiles can override an allow action by terminating sessions based on rate limits or attack signatures.
Detailed technical explanation
How to think about this question
DoS Protection profiles operate by tracking session rates and counts per source IP, destination IP, or zone, using a token bucket algorithm to enforce thresholds. When a threshold is exceeded, the firewall can randomly drop packets or terminate sessions to protect resources, which is distinct from security policy actions. Zone Protection Profiles similarly enforce flood protection (e.g., SYN flood, ICMP flood) and other attack mitigations at the zone level, which can cause session termination even when the security policy allows the traffic.
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.
Core Concepts and Architecture — This question tests Core Concepts and Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: DoS Protection — A DoS Protection profile can terminate sessions that exceed configured thresholds for rate, connection count, or other attack-related criteria, even if the security policy explicitly allows the traffic. When the firewall detects that a session matches a DoS Protection rule and the traffic rate or concurrent session count surpasses the defined threshold, it will drop the session to mitigate the attack, overriding the allow action from the security policy.
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.
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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