20+ practice questions focused on Securing Traffic and App-ID — one of the most tested topics on the Palo Alto Networks Certified Network Security Engineer PCNSE exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Securing Traffic and App-ID PracticeDuring a security incident, an analyst notices that certain malware traffic is using port 443 but is being identified as 'ssl'. The malware uses a unique handshake that differs from standard SSL. Which two actions should the analyst take to correctly identify and block this malware? (Choose two.)
Explanation: Options C and E are correct. Creating a custom application signature (C) enables the firewall to identify the malware based on its unique handshake, bypassing the default SSL identification. Then, creating an application override rule (E) forces the firewall to treat the traffic as that custom application, allowing it to match a security rule with action Deny. Option A is incorrect because without identification, a security rule cannot block the traffic. Option B is incorrect as disabling decryption prevents visibility into encrypted payloads. Option D is incorrect because decryption is not required for identification via App-ID.
A security policy has an application list with 'facebook-chat' and 'facebook-base'. A user reports that Facebook messages are being blocked. The firewall logs show the application as 'facebook-base' but not as 'facebook-chat'. What is the most likely reason?
Explanation: 'facebook-chat' is a dependent application of 'facebook-base'. In Palo Alto Networks App-ID, dependent applications are sub-applications that are only identified when the parent application is detected. The logs show only 'facebook-base', indicating the traffic does not contain the specific characteristics to be identified as 'facebook-chat'. Although the policy explicitly lists both applications, the firewall identifies only one application per session. Since the traffic is matched to 'facebook-base', the 'facebook-chat' dependent application is not separately allowed, and the user's chat messages are blocked because they are not being recognized as the chat application.
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?
Explanation: When a custom App-ID is created for a proprietary protocol, the firewall cannot automatically identify the application by inspecting the traffic. An application override rule is required to explicitly map the traffic (based on IP, port, or other criteria) to the custom App-ID, bypassing the firewall's default App-ID identification process. Without this override, the firewall continues to apply its default classification, which may block the traffic if it doesn't match any known application.
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?
Explanation: When a firewall operates as a transparent bridge without SSL decryption, it relies on the Server Name Indication (SNI) field or the certificate exchange during the TLS handshake to identify HTTPS traffic as 'ssl'. Asymmetric routing causes the firewall to see only one direction of the TCP handshake (e.g., only the SYN or only the SYN-ACK), preventing it from observing the full TLS handshake. Without the complete handshake, App-ID cannot extract the necessary signatures (e.g., TLS version, cipher suites, certificate details) and falls back to classifying the traffic as 'web-browsing' based on port 443.
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?
Explanation: App-ID allows you to create a security rule that explicitly allows only the specified applications ('facebook-base' and 'youtube') while implicitly denying all other traffic. Since the default action for any traffic not matching an allow rule is 'deny', this rule achieves the goal of blocking all other applications without needing an explicit block rule.
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2. Review every explanation
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3. Focus on exam traps
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4. Reach 80% consistently
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