PCNSE Securing Traffic and App-ID Practice Question
This PCNSE practice question tests your understanding of securing traffic and app-id. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
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
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
Rule 1 allows all applications because it uses 'application any'.
Rule 1 matches all applications before the more specific rules, causing all traffic to be allowed.
B
App-ID is not enabled on the firewall.
Why wrong: If App-ID were disabled, no application would be identified.
C
Rule 4 is a deny rule but it is not effective because the traffic is allowed earlier.
Why wrong: Rule 4 is after rule 1, but rule 1 allows the traffic.
D
The rule order is incorrect; rule 3 should be moved before rule 1.
Why wrong: Moving rule 3 would not fix the issue because rule 1 allows all applications.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rule 1 allows all applications because it uses 'application any'.
Rule 1 uses 'application any', which matches all applications regardless of the specific App-ID. Since security policies are evaluated from top to bottom and the first matching rule is applied, any traffic that matches Rule 1's source, destination, and service will be allowed, including 'ssl' traffic. The explicit allow rules for 'ms-update' and 'facebook-base' are irrelevant because Rule 1 catches all traffic first.
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.
✓
Rule 1 allows all applications because it uses 'application any'.
Why this is correct
Rule 1 matches all applications before the more specific rules, causing all traffic to be allowed.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
App-ID is not enabled on the firewall.
Why it's wrong here
If App-ID were disabled, no application would be identified.
✗
Rule 4 is a deny rule but it is not effective because the traffic is allowed earlier.
Why it's wrong here
Rule 4 is after rule 1, but rule 1 allows the traffic.
✗
The rule order is incorrect; rule 3 should be moved before rule 1.
Why it's wrong here
Moving rule 3 would not fix the issue because rule 1 allows all applications.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Palo Alto Networks often tests the misconception that adding a deny rule later in the policy will block traffic that was already allowed by an earlier rule, but the trap here is that rule order is evaluated top-down and the first match wins, so a broad allow rule with 'application any' will permit all traffic before any deny or specific allow rules are reached.
Detailed technical explanation
How to think about this question
In Palo Alto Networks firewalls, security rules are evaluated in sequential order, and the first rule that matches all criteria (source, destination, application, service) is applied. When 'application any' is used, the firewall skips App-ID inspection for that rule, allowing all application traffic that matches the other criteria. This is a common misconfiguration when engineers intend to allow only specific applications but inadvertently place a broad 'application any' rule above the specific ones, causing all traffic to be permitted.
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.
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: Rule 1 allows all applications because it uses 'application any'. — Rule 1 uses 'application any', which matches all applications regardless of the specific App-ID. Since security policies are evaluated from top to bottom and the first matching rule is applied, any traffic that matches Rule 1's source, destination, and service will be allowed, including 'ssl' traffic. The explicit allow rules for 'ms-update' and 'facebook-base' are irrelevant because Rule 1 catches all traffic first.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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