This PCNSA practice question tests your understanding of app-id and content-id. 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.
Which THREE factors should be considered when troubleshooting App-ID misidentification? (Choose three.)
Packet size exceeds the maximum transmission unit.
Why wrong: Packet size is unrelated.
An application override is configured that misidentifies the app.
Override can force an incorrect identification.
Traffic is encrypted and decryption is not enabled.
Encrypted traffic may not be fully identified without decryption.
Asymmetric routing is causing the firewall to see only one direction of traffic.
App-ID requires both directions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
An application override is configured that misidentifies the app.
Option B is correct because an application override explicitly forces the firewall to classify traffic as a specific application, bypassing App-ID's signature-based identification. If the override is misconfigured, the firewall will consistently misidentify the traffic, leading to incorrect policy enforcement. This is a common cause of App-ID misidentification when administrators manually override the default identification process.
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.
Packet size exceeds the maximum transmission unit.
Why it's wrong here
Packet size is unrelated.
An application override is configured that misidentifies the app.
Why this is correct
Override can force an incorrect identification.
Related concept
Read the scenario before looking for a memorised answer.
Traffic is encrypted and decryption is not enabled.
Why this is correct
Encrypted traffic may not be fully identified without decryption.
Related concept
Read the scenario before looking for a memorised answer.
Asymmetric routing is causing the firewall to see only one direction of traffic.
Why this is correct
App-ID requires both directions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates may think packet size or MTU issues affect App-ID, but App-ID operates at layers 4-7 and is not impacted by fragmentation; the real focus is on decryption, routing symmetry, and override configurations.
Detailed technical explanation
App-ID uses multiple mechanisms including protocol decoding, signature matching, and behavioral analysis to identify applications. For encrypted traffic, without SSL decryption, App-ID can only identify the protocol (e.g., TLS) but not the specific application (e.g., Facebook vs. YouTube). Asymmetric routing disrupts the firewall's session table because it may see SYN packets in one direction but not the corresponding SYN-ACK, causing the session to be incomplete and App-ID to fail. Application overrides are configured via security policy rules and bypass all App-ID processing, so a misconfigured override directly causes misidentification.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
App-ID and Content-ID — This question tests App-ID and Content-ID — Read the scenario before looking for a memorised answer..
The correct answer is: An application override is configured that misidentifies the app. — Option B is correct because an application override explicitly forces the firewall to classify traffic as a specific application, bypassing App-ID's signature-based identification. If the override is misconfigured, the firewall will consistently misidentify the traffic, leading to incorrect policy enforcement. This is a common cause of App-ID misidentification when administrators manually override the default identification process.
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 11, 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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