Quick Answer
The answer is the External Dynamic List (EDL). This is the correct choice because an EDL allows a Palo Alto Networks firewall to import and automatically update a list of known malicious domains from an external threat intelligence vendor on a scheduled basis, such as every five minutes, ensuring the firewall dynamically blocks newly identified threats without manual intervention. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this concept tests your understanding of how to automate threat prevention using cloud-sourced feeds, often appearing in questions about blocking daily updated malicious domains where a static Address Object or custom URL Category would fail due to lack of dynamic updates. A common trap is selecting a Custom URL Category, but remember that EDLs are designed for externally hosted, frequently changing lists. Memory tip: think “EDL = External Dynamic List = External Data that Lives and updates automatically.”
This PCNSA practice question tests your understanding of managing objects. 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 needs to block a list of known malicious domains that is updated daily by a threat intelligence vendor. Which Palo Alto Networks object should be used?
External Dynamic List (EDL)
EDL can consume frequently updated lists of domains or IPs.
Custom URL Category
Why wrong: Custom URL Categories are manually defined and not suitable for dynamic updates.
Address Group
Why wrong: Address Groups contain IP addresses, not domain names.
Application Filter
Why wrong: Application Filters are for applications, not domains.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
External Dynamic List (EDL)
An External Dynamic List (EDL) is the correct object because it allows Palo Alto Networks firewalls to import and automatically update a list of known malicious domains from an external threat intelligence vendor on a scheduled basis (e.g., every 5 minutes). This ensures the firewall dynamically blocks newly identified malicious domains without manual intervention, making it ideal for a daily-updated feed.
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.
External Dynamic List (EDL)
Why this is correct
EDL can consume frequently updated lists of domains or IPs.
Related concept
Read the scenario before looking for a memorised answer.
Custom URL Category
Why it's wrong here
Custom URL Categories are manually defined and not suitable for dynamic updates.
Address Group
Why it's wrong here
Address Groups contain IP addresses, not domain names.
Application Filter
Why it's wrong here
Application Filters are for applications, not domains.
Common exam traps
The trap here is that candidates often confuse Custom URL Categories with EDLs, assuming a manually updated list can suffice for dynamic feeds, but the exam emphasizes that EDLs are the only object designed for automated, external-sourced updates.
Detailed technical explanation
EDLs in PAN-OS support multiple formats (e.g., plain text, CSV, or JSON) and can be configured to refresh at intervals as low as 5 minutes via HTTP/HTTPS. The firewall parses the list and creates dynamic security policy rules that match against the domains, IPs, or URLs in the EDL, which is critical for real-time threat intelligence integration. A subtle behavior is that EDLs can also include IP addresses and URLs, but for domain-only blocking, the list must be formatted correctly (e.g., one domain per line) to avoid policy misconfiguration.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCNSA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Managing Objects — This question tests Managing Objects — Read the scenario before looking for a memorised answer..
The correct answer is: External Dynamic List (EDL) — An External Dynamic List (EDL) is the correct object because it allows Palo Alto Networks firewalls to import and automatically update a list of known malicious domains from an external threat intelligence vendor on a scheduled basis (e.g., every 5 minutes). This ensures the firewall dynamically blocks newly identified malicious domains without manual intervention, making it ideal for a daily-updated feed.
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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