The correct approach is to block the social-networking category and then allow a custom URL category containing LinkedIn URLs. This works because Palo Alto Networks URL filtering processes categories in a priority order where explicit allow rules override broader block rules; by blocking the entire social-networking category first, you prevent all social media traffic, and then by creating a custom URL category with LinkedIn’s domains set to allow, you create a specific exception that takes precedence. On the PCNSA exam, this scenario tests your understanding of URL filtering policy precedence and the use of custom categories to create granular exceptions—a common trap is thinking you can simply allow the social-networking category and then block everything else, but that would permit all social media. A helpful memory tip is to think of it as “block the ocean, allow the island”: you block the wide category first, then carve out a specific allowed exception.
PCNSA Securing Traffic Practice Question
This PCNSA practice question tests your understanding of securing traffic. 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 company wants to block all social media except LinkedIn. Which combination of URL filtering actions should be implemented?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Block the social-networking category and allow a custom URL category containing LinkedIn URLs.
Option C is correct because blocking the social-networking category and then creating a custom URL category with LinkedIn's URLs set to allow overrides the block. Option A is wrong because allowing social-networking would allow all social media. Option B is wrong because blocking LinkedIn specifically would also block it. Option D is wrong because alert does not block.
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.
✓
Block the social-networking category and allow a custom URL category containing LinkedIn URLs.
Why this is correct
Block the category, then allow the specific override.
Related concept
Static NAT maps one inside address to one outside address.
✗
Alert the social-networking category and block a custom URL category for LinkedIn.
Why it's wrong here
Alert does not block; it only logs.
✗
Block the social-networking category and block a custom URL category for LinkedIn.
Why it's wrong here
Blocking both would block LinkedIn.
✗
Allow the social-networking category and block a custom URL category for LinkedIn.
Why it's wrong here
Allowing social-networking permits all social media.
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 PCNSA NAT questions on configuration and troubleshooting.
Securing Traffic — This question tests Securing Traffic — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Block the social-networking category and allow a custom URL category containing LinkedIn URLs. — Option C is correct because blocking the social-networking category and then creating a custom URL category with LinkedIn's URLs set to allow overrides the block. Option A is wrong because allowing social-networking would allow all social media. Option B is wrong because blocking LinkedIn specifically would also block it. Option D is wrong because alert does not block.
What should I do if I get this PCNSA 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 PCNSA 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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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.
Question Discussion
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