PCNSE · topic practice

Securing Traffic and App-ID practice questions

Practise Palo Alto Networks Certified Network Security Engineer PCNSE Securing Traffic and App-ID practice questions — original exam-style scenarios with answer choices, explanations, and analysis of common mistakes.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Reviewed byJohnson Ajibi· MSc IT Security
20 questionsDomain: Securing Traffic and App-ID

What the exam tests

What to know about Securing Traffic and App-ID

Securing Traffic and App-ID questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Watch out for

Common Securing Traffic and App-ID exam traps

  • Answering from memory before reading the full scenario.
  • Missing a constraint such as cost, availability, security, scope or command context.
  • Choosing a broad answer when the question asks for the most specific fix.
  • Ignoring why the wrong options are tempting.

Practice set

Securing Traffic and App-ID questions

20 questions · select your answer, then reveal the explanation

A security engineer notices that traffic from a trusted internal application is being blocked by the firewall. The application communicates using a proprietary protocol over TCP port 8443. The engineer has already created a custom App-ID for this application but the traffic is still being blocked. What is the most likely reason?

During a security audit, it is discovered that some HTTP traffic is being incorrectly identified as 'web-browsing' instead of 'ssl' even though the traffic uses HTTPS. The firewall is positioned as a transparent bridge and no SSL decryption is configured. What is the most likely cause?

A network administrator wants to allow only specific applications such as 'facebook-base' and 'youtube' while blocking all other applications. Which type of security rule should be used to achieve this?

A company deploys a Palo Alto Networks firewall in a data center. They have a critical application that uses a proprietary protocol over UDP port 12345. The firewall is not correctly identifying the traffic as the custom App-ID they created. They have verified that the custom App-ID is correctly configured and committed. What is the most likely cause?

An administrator notices that traffic for a known application 'ms-update' is being blocked. The security policy has a rule allowing 'ms-update' from the internal network to the internet. However, the traffic is being denied. What should the administrator check first?

Which TWO of the following are valid methods to create a custom App-ID on a Palo Alto Networks firewall?

Which THREE of the following can cause App-ID to incorrectly identify traffic?

Refer to the exhibit. A firewall administrator is troubleshooting why some applications are not being correctly identified. The firewall is running App-ID version 8000-7120. What does the 'appid packet buffer: 1024 KB' indicate?

Exhibit

Refer to the exhibit.

admin@PA-220> show system info | match appid
appid version: 8000-7120
appid last update: 2024/10/01 03:00:00
appid packet buffer: 1024 KB
appid max sessions: 500000

Refer to the exhibit. A network engineer wants to allow only 'ms-update' and 'facebook-base' traffic. After committing the above security policy, they find that 'ssl' traffic is also being allowed. What is the most likely reason?

Exhibit

Refer to the exhibit.

admin@PA-220> show running security-policy | match app
rule id 1: application any -> allow
rule id 2: application ms-update, facebook-base -> allow
rule id 3: application ssl, web-browsing -> allow
rule id 4: application any -> deny

A security engineer is troubleshooting a Palo Alto Networks firewall where HTTP traffic is being incorrectly identified by App-ID. The engineer has verified that the application is correctly configured in the application override policy. Which two factors could cause App-ID to fail to recognize the application?

Refer to the exhibit. A network engineer notices high CPU utilization on the firewall. The output shows that 4500 sessions are pending App-ID identification. What is the most likely cause of the high number of pending sessions?

Exhibit

Refer to the exhibit.

show system state | match appid
total appid sessions: 12000
appid pending sessions: 4500
appid complete sessions: 7500
appid error sessions: 0

A company uses App-ID to identify traffic on their Palo Alto Networks firewall. They notice that a particular application, custom-db-sync, is not being identified correctly. The traffic uses a proprietary protocol over TCP port 4444. The firewall currently has a security rule allowing any application on that port. Which step should the engineer take to enable App-ID to correctly identify custom-db-sync?

Question 13hardmulti select
Read the full NAT/PAT explanation →

A network engineer is troubleshooting an issue where a web application is being incorrectly identified as 'web-browsing' instead of 'webmail-gmail' by the Palo Alto Networks firewall. The firewall has App-ID enabled and all signatures are up to date. Which TWO actions should the engineer take to resolve this misidentification?

Order the steps to configure a security policy allowing HTTP traffic from the inside to the outside zone.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Order the steps to upgrade the PAN-OS software on a standalone firewall.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5

Match each PAN-OS component to its description.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Handles configuration, logging, and reporting

Processes traffic and enforces security policies

Manages routing and session setup

Collects and stores logs for analysis

Centralized management for multiple firewalls

Match each decryption type to its description.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Decrypts outbound traffic to inspect it

Decrypts inbound traffic to servers

Decrypts SSH traffic for policy enforcement

Traffic bypasses decryption

Sends decrypted traffic to a monitoring tool

An administrator needs to create a custom application for a proprietary database protocol that uses TCP port 7890. What is the first step in defining this application in App-ID?

An engineer wants to block all peer-to-peer file sharing traffic using App-ID. What security policy action should be used?

Question 20easymultiple choice
Read the full NAT/PAT explanation →

A network engineer notices that traffic from an internal user to a web application is being incorrectly identified as 'web-browsing' instead of the custom application 'my-app'. The engineer has already created a custom application 'my-app' with the correct signature. What is the most likely reason for the misidentification?

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Frequently asked questions

What does the PCNSE exam test about Securing Traffic and App-ID?
Securing Traffic and App-ID questions test whether you can apply the concept in context, not just recognise a definition.
How should I use these practice questions?
Select your answer before revealing the explanation. Then read why each option is right or wrong — this active recall approach builds retention far faster than re-reading notes.
Can I practise just Securing Traffic and App-ID questions in a focused session?
Yes — the session launcher on this page draws every question from the Securing Traffic and App-ID domain. Use a 10-question session first to gauge your baseline, then move to 20 or 30 once the weak spots are clear.
Where can I practise other PCNSE topics?
Use the topic links above to move to related areas, or go back to the PCNSE question bank to see all topics.
Are these real exam questions or dumps?
These are original practice questions written to test the same concepts the PCNSE exam covers. They are not copied from any real exam or dump site.