PCNSE Decryption and SSL Inspection Practice Question
This PCNSE practice question tests your understanding of decryption and ssl inspection. 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.
Exhibit
Refer to the exhibit.
```
> show ssl-decrypt statistics
SSL Decryption Statistics
Total sessions decrypted: 45032
Total sessions bypassed: 2341
Bypass reasons:
unsupported cipher: 1200
certificate validation failure: 800
handshake failure: 341
Currently active sessions: 105
```
Based on the exhibit, what is the most likely cause for the majority of bypassed sessions?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The firewall's SSL/TLS service profile does not include the cipher suites used by the clients or servers.
The majority of bypassed sessions are most likely caused by a cipher mismatch between the firewall's SSL/TLS service profile and the clients or servers. When the firewall decrypts traffic, it must negotiate a cipher suite that both the client and server support; if the service profile does not include the cipher suites used by the endpoints, the firewall cannot complete the SSL/TLS handshake and bypasses the session. This is a common misconfiguration in Palo Alto Networks firewalls where the SSL/TLS service profile's cipher list is too restrictive.
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.
✓
The firewall's SSL/TLS service profile does not include the cipher suites used by the clients or servers.
Why this is correct
Most bypasses are due to unsupported ciphers.
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.
✗
The firewall is overloaded and cannot handle more decryption sessions.
Why it's wrong here
Active sessions are low, so not overloaded.
✗
The decryption certificate is not trusted by clients.
Why it's wrong here
That would cause certificate validation failures, which are fewer.
✗
There is a network connectivity issue between firewall and servers.
Why it's wrong here
Connectivity issues would cause handshake failures, which are minimal.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'bypassed sessions' with 'decryption failures' due to certificate issues or network problems, but bypassed sessions specifically indicate the firewall intentionally skipped decryption due to configuration mismatches like cipher or protocol version incompatibility.
Detailed technical explanation
How to think about this question
Palo Alto Networks firewalls use the SSL/TLS service profile to define allowed cipher suites, protocol versions, and key exchange algorithms for decryption. During the SSL/TLS handshake, the firewall acts as a proxy and must match a cipher suite from its profile with those offered by the client and server; if no match exists, the firewall cannot decrypt and logs the session as 'bypassed' with reason 'cipher mismatch'. In real-world scenarios, this often occurs when legacy clients use outdated ciphers like RC4 or when the profile is configured with only modern suites like TLS 1.3 ciphers, causing older systems to be bypassed.
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.
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.
Decryption and SSL Inspection — This question tests Decryption and SSL Inspection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The firewall's SSL/TLS service profile does not include the cipher suites used by the clients or servers. — The majority of bypassed sessions are most likely caused by a cipher mismatch between the firewall's SSL/TLS service profile and the clients or servers. When the firewall decrypts traffic, it must negotiate a cipher suite that both the client and server support; if the service profile does not include the cipher suites used by the endpoints, the firewall cannot complete the SSL/TLS handshake and bypasses the session. This is a common misconfiguration in Palo Alto Networks firewalls where the SSL/TLS service profile's cipher list is too restrictive.
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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