Quick Answer
The answer is the Server Name Indication (SNI). This is correct because the SNI is transmitted in cleartext during the initial TLS handshake, before the encrypted tunnel is established, allowing App-ID to identify the destination hostname from encrypted traffic without SSL decryption. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this concept tests your understanding of how App-ID leverages protocol metadata for application visibility even when decryption is disabled—a common trap is assuming all TLS fields are encrypted, but the SNI field remains visible by design. A helpful memory tip: think of the SNI as the “name tag” on the outside of a sealed envelope—you can see who it’s addressed to without opening it.
This PCNSA practice question tests your understanding of app-id and content-id. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A company has a security policy that allows 'ssl' application but does not have SSL decryption enabled. What can App-ID still identify from the encrypted session?
The SNI (Server Name Indication).
SNI is transmitted in cleartext and can help identify the intended server.
The exact URL being accessed.
Why wrong: URLs are encrypted within the TLS session.
The file type being transferred.
Why wrong: File types require decryption to inspect payload.
The client and server IP addresses.
Why wrong: IP addresses are always visible but not application-specific.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The SNI (Server Name Indication).
App-ID can identify the SNI (Server Name Indication) from an encrypted session because the SNI is sent in cleartext during the TLS handshake, before encryption begins. This allows the firewall to determine the destination hostname without decrypting the traffic, enabling policy enforcement based on the application or domain even when SSL decryption is disabled.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The SNI (Server Name Indication).
Why this is correct
SNI is transmitted in cleartext and can help identify the intended server.
Related concept
Read the scenario before looking for a memorised answer.
The exact URL being accessed.
Why it's wrong here
URLs are encrypted within the TLS session.
The file type being transferred.
Why it's wrong here
File types require decryption to inspect payload.
The client and server IP addresses.
Why it's wrong here
IP addresses are always visible but not application-specific.
Common exam traps
The trap here is that candidates assume all encrypted traffic is opaque to App-ID, but the SNI field remains visible and can be used for application identification, which is a key distinction tested in the PCNSA exam.
Detailed technical explanation
The SNI extension is defined in RFC 6066 and allows a client to specify the hostname it intends to connect to during the TLS handshake. This field is transmitted in cleartext even in TLS 1.3, which otherwise encrypts more of the handshake. In a real-world scenario, a company might use SNI-based App-ID to block access to social media sites like facebook.com while allowing other encrypted traffic, all without decrypting the sessions.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
App-ID and Content-ID — study guide chapter
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FAQ
App-ID and Content-ID — This question tests App-ID and Content-ID — Read the scenario before looking for a memorised answer..
The correct answer is: The SNI (Server Name Indication). — App-ID can identify the SNI (Server Name Indication) from an encrypted session because the SNI is sent in cleartext during the TLS handshake, before encryption begins. This allows the firewall to determine the destination hostname without decrypting the traffic, enabling policy enforcement based on the application or domain even when SSL decryption is disabled.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This PCNSA practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNSA exam.
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