PCNSE Securing Traffic and App-ID Practice Question
This PCNSE practice question tests your understanding of securing traffic and app-id. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 security administrator notices that HTTP traffic is correctly identified as web-browsing but HTTPS traffic is showing as ssl. The company uses a custom HTTPS-based application that needs to be identified by its own App-ID. What should the administrator do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an App-ID override (custom application) for the custom application.
Option B is correct because creating an App-ID override allows the administrator to define a custom application signature for the traffic, ensuring it is identified as the custom application rather than ssl. Option A is wrong because configuring a custom URL category does not affect App-ID. Option C is wrong because SSL decryption alone does not change the application identity; it only allows inspection. Option D is wrong because disabling App-ID would bypass application identification entirely.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Enable SSL decryption on the firewall.
Why it's wrong here
SSL decryption enables inspection but does not change the application identity without additional configuration.
✗
Configure a custom URL category for the application.
Why it's wrong here
URL categories are for URL filtering, not for App-ID identification.
✓
Create an App-ID override (custom application) for the custom application.
Why this is correct
App-ID overrides allow custom application signatures to match specific traffic patterns.
Related concept
Static NAT maps one inside address to one outside address.
✗
Disable App-ID for the traffic.
Why it's wrong here
Disabling App-ID would bypass application identification, not improve it.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSE NAT questions on configuration and troubleshooting.
Securing Traffic and App-ID — This question tests Securing Traffic and App-ID — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Create an App-ID override (custom application) for the custom application. — Option B is correct because creating an App-ID override allows the administrator to define a custom application signature for the traffic, ensuring it is identified as the custom application rather than ssl. Option A is wrong because configuring a custom URL category does not affect App-ID. Option C is wrong because SSL decryption alone does not change the application identity; it only allows inspection. Option D is wrong because disabling App-ID would bypass application identification entirely.
What should I do if I get this PCNSE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSE NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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