- A
Protocol (TCP, UDP, etc.)
Protocol is a mandatory field in custom signatures.
- B
Port number
Port can be specified to limit scope.
- C
Data pattern (regular expression or byte sequence)
Data patterns allow matching on payload content.
- D
URL category
Why wrong: URL categories are separate from App-ID signatures.
- E
Security policy action
Why wrong: Policy action is not an attribute of the signature.
Question 49 of 516
PCNSE Securing Traffic and App-ID Practice Question
This PCNSE practice question tests your understanding of securing traffic and app-id. 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 attributes can be used in a custom App-ID signature to identify an application? (Choose three.)
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
✓
Protocol (TCP, UDP, etc.)
A is correct because the protocol (TCP, UDP, etc.) is a fundamental attribute used in custom App-ID signatures to define the transport layer over which the application traffic flows. The firewall uses this to match the signature against the correct protocol type, ensuring accurate application identification.
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.
- ✓
Protocol (TCP, UDP, etc.)
Why this is correct
Protocol is a mandatory field in custom signatures.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Port number
Why this is correct
Port can be specified to limit scope.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Data pattern (regular expression or byte sequence)
Why this is correct
Data patterns allow matching on payload content.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
URL category
Why it's wrong here
URL categories are separate from App-ID signatures.
- ✗
Security policy action
Why it's wrong here
Policy action is not an attribute of the signature.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common misconception is that URL category or security policy action are part of App-ID signature attributes, but they are separate features (URL Filtering and Policy Enforcement) that operate after App-ID identification is complete.
Detailed technical explanation
How to think about this question
Custom App-ID signatures are defined in the 'Application and Threat Prevention' section of the firewall, where you specify protocol, port, and data patterns (e.g., regular expressions or byte sequences) to match application traffic. Under the hood, the firewall's App-ID engine performs deep packet inspection (DPI) on the first few packets of a session, using these attributes to identify the application before any security policy action is applied. In real-world scenarios, you might create a custom signature for a proprietary application that uses a specific TCP port and a unique byte sequence in the payload, ensuring accurate identification even if the application uses non-standard ports.
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 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.
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCNSE question test?
Securing Traffic and App-ID — This question tests Securing Traffic and App-ID — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Protocol (TCP, UDP, etc.) — A is correct because the protocol (TCP, UDP, etc.) is a fundamental attribute used in custom App-ID signatures to define the transport layer over which the application traffic flows. The firewall uses this to match the signature against the correct protocol type, ensuring accurate application identification.
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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Last reviewed: Jul 4, 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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