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Decryption and SSL Inspection

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

29 questions7 easy12 medium10 hard

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What to know about Decryption and SSL Inspection

Decryption and SSL Inspection 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 Decryption and SSL Inspection 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.

Question index

All Decryption and SSL Inspection questions (29)

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1

A multinational corporation uses Palo Alto Networks firewalls at its headquarters and five branch offices. SSL Forward Proxy decryption is enabled for all outbound HTTPS traffic. Recently, users in the finance department have reported that several banking and financial websites fail to load, displaying a certificate error in the browser. The errors occur only for these specific sites, while other HTTPS sites work fine. The firewall administrator has already added decryption exclusion rules for the affected domains, but the problem persists. The decryption policy is configured with a single rule that decrypts all ssl service traffic, and the exclusion rules are placed below this global decrypt rule. Which of the following is the best course of action to resolve the issue?

Hard
2

Which TWO of the following are supported decryption scenarios on a Palo Alto Networks firewall?

Easy
3

A network administrator observes that some SSL connections are failing to be decrypted. Based on the exhibit, what is the most likely reason for the majority of the failures?

Medium
4

Which TWO conditions typically cause the firewall to bypass SSL decryption for a session? (Choose two.)

Medium
5

Which TWO of the following are valid considerations when designing an SSL Forward Proxy decryption deployment in a Palo Alto Networks firewall?

Hard
6

A security administrator wants to minimize the performance impact of SSL decryption on the firewall. Which best practice should be applied?

Easy
7

Which TWO types of traffic should typically be excluded from SSL decryption for compliance or operational reasons? (Choose two.)

Easy
8

During SSL decryption, the firewall logs show 'ssl_decrypt_unsupported_cipher' errors for several connections. What is the likely cause and solution?

Hard
9

A network administrator is troubleshooting decryption failures for HTTPS traffic to a financial website. The firewall is configured with SSL Forward Proxy decryption policy that applies to the 'financial-services' URL category. The firewall uses an internal CA certificate to sign generated certificates. Users report a certificate error in their browsers when accessing 'https://www.bankofalice.com'. The error says the certificate is not trusted, even though the internal CA certificate is installed on all client devices. The administrator checks the firewall logs and sees no decryption errors; the session is being decrypted successfully. The administrator also confirms that the decryption policy is active and the firewall is not bypassing decryption. What is the most likely cause of the certificate error?

Easy
10

An engineer is configuring SSL Forward Proxy decryption for internal users. The firewall must decrypt traffic to all external HTTPS sites except specific financial services domains that require end-to-end encryption. Which best practice should the engineer implement to achieve this?

Medium
11

An organization is deploying SSL inbound proxy decryption (SSLi) to protect servers in a DMZ. Which consideration is critical for the firewall to properly decrypt inbound traffic destined to these servers?

Hard
12

A company wants to decrypt traffic to productivity and collaboration sites but avoid decrypting traffic to financial and healthcare sites due to compliance. How should the SSL decryption policy be configured?

Medium
13

A user from subnet 10.0.1.0/24 accesses a website categorized as 'Finance'. Based on the exhibit, what will be the result?

Hard
14

What is the primary purpose of SSL decryption in a Palo Alto Networks firewall?

Easy
15

Which best practice should be followed for certificate management when deploying SSL Forward Proxy decryption in a large enterprise?

Medium
16

A Palo Alto Networks firewall is configured for SSL Forward Proxy decryption. The security team wants to ensure that decrypted traffic is also inspected by an external DLP appliance. How should this be achieved?

Hard
17

Which TWO statements are true about TLS version 1.3 support in Palo Alto Networks decryption?

Hard
18

Which THREE steps should be taken to troubleshoot an SSL decryption issue where users are unable to access specific HTTPS websites? (Choose three.)

Hard
19

A company is deploying SSL Forward Proxy decryption for outbound HTTPS traffic. They want to ensure that traffic to financial sites (e.g., *.bank.com) is not decrypted due to compliance requirements. Which method should be used to exclude this traffic from decryption?

Medium
20

Based on the exhibit, what is the most likely cause for the majority of bypassed sessions?

Medium
21

A user reports that after SSL decryption was enabled, certain web applications fail to load completely. What is the most likely reason?

Easy
22

After enabling SSL Forward Proxy decryption, users report that they cannot access HTTPS websites and receive certificate errors. The firewall's decryption certificate is properly installed on client machines. What is the most likely cause?

Medium
23

Match each high availability (HA) term to its definition.

Medium
24

A company uses SSL Forward Proxy decryption for user traffic. Recently, some users cannot access a specific HTTPS website that uses a self-signed certificate. The firewall's decryption policy is set to 'decrypt' and the action is 'forward proxy'. The firewall does not have the self-signed CA certificate installed. What is the most likely cause of the issue?

Medium
25

You are a network security engineer at a multinational corporation. The company has a main data center and three branch offices connected via MPLS. The firewall at the data center is a PA-5250 running PAN-OS 10.2. The firewall is configured for SSL Forward Proxy decryption of all outbound HTTPS traffic from internal users to the internet. Recently, users in Branch Office A report that they cannot access several external HTTPS websites, while users at other branches and the data center have no issues. The decryption policy for Branch Office A is identical to the others. You check the decryption statistics and see that for Branch Office A, the number of 'SSL handshake failures' is high. You also notice that the firewall's system log shows errors like 'peer certificate chain validation failure' for sessions from Branch Office A. The firewall has a forward trust certificate issued by an internal CA, and the internal CA certificate is installed on all clients. What is the most likely cause of this issue?

Hard
26

Which THREE statements are true regarding SSL Forward Proxy decryption on Palo Alto Networks firewalls?

Hard
27

Order the steps to configure a static route on a Palo Alto Networks firewall.

Medium
28

A company has deployed SSL Inbound Inspection to inspect HTTPS traffic to their internal web server hosting a custom application that requires mutual TLS authentication. The firewall is configured with a decryption policy that includes the server's certificate and the action 'decrypt'. The web server is configured to request client certificates. After implementation, users report that the application fails to authenticate them. The firewall logs show that SSL handshake with the client completes successfully, but the server never receives the client certificate during the handshake. The administrator has verified that the decryption policy is active and the server certificate is correctly imported. What is the most likely cause of this issue?

Medium
29

Based on the exhibit, what is the most likely action for the firewall to take on this session?

Easy

Frequently asked questions

What does the Decryption and SSL Inspection domain cover on the PCNSE exam?
Decryption and SSL Inspection questions test whether you can apply the concept in context, not just recognise a definition.
How many questions are in this domain?
This page lists all 29 Decryption and SSL Inspection questions in the PCNSE question bank. The actual exam draws from this domain proportionally to its weighting in the official exam blueprint.
What is the best way to practise this domain?
Start with a short focused session (10 questions) to identify gaps, then work through explanations. Repeat with a longer session once the weak areas feel solid.
Can I practise only Decryption and SSL Inspection questions?
Yes — the session launcher on this page filters questions to this domain only. Choose any session length for inline explanations and scoring.
paloalto-pcnse PALOALTO-PCNSE decryption ssl Practice Questions