The correct action is to enable session re-aging and set a short timeout for the application. This forces the firewall to re-evaluate existing sessions against the current security policy, so when a session re-aging policy change is not blocking traffic, the firewall will age out older sessions and re-match them against the newly pushed rule, like the 'app-block-rule'. On the PCNSE exam, this scenario tests your understanding of session table behavior versus policy evaluation—a common trap is assuming a new rule instantly applies to all traffic, but established sessions are grandfathered under the old policy until they expire. Remember that session re-aging is the only way to force a policy re-check without manually clearing sessions; think of it as a "session reset button" for policy changes. A helpful memory tip: "Re-age to re-engage"—if traffic isn't blocking after a policy push, re-aging forces the firewall to re-engage with the new rule.
PCNSE Manage, Monitor and Operate Practice Question
This PCNSE practice question tests your understanding of manage, monitor and operate. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 large organization has a PA-5250 firewall pair in active/passive HA mode. The firewalls are managed by Panorama. The security team recently created a new security policy rule to block a specific application (app-block-rule) and pushed the configuration from Panorama. After the push, the active firewall shows the new rule in the security policy list, but traffic matching the rule is not being blocked. The administrator checks the traffic logs and sees that the traffic is being allowed by a different rule with a higher priority. The administrator also notices that the 'app-block-rule' has an 'any' source and destination zone, but the allowed rule has specific zones. The administrator runs 'show session info' and sees that the sessions are being created before the policy push. The administrator wants to ensure that existing sessions are subject to the new policy. Which action should the administrator take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable session re-aging and set a short timeout for the application
Option D is correct because session re-aging forces the firewall to re-evaluate existing sessions against the current security policy. When a new policy is pushed, sessions established before the push continue to match the old policy until they expire. By enabling session re-aging and setting a short timeout, the firewall will age out those sessions sooner, causing them to be re-matched against the new 'app-block-rule' and thus be blocked.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Disable session re-aging on the firewall
Why it's wrong here
Disabling re-aging would keep old sessions unaffected.
✗
Commit the configuration on the active firewall
Why it's wrong here
Committing does not affect existing sessions.
✗
Move the new rule to the top of the security policy
Why it's wrong here
Rule order does not affect existing sessions.
✓
Enable session re-aging and set a short timeout for the application
Why this is correct
Session re-aging forces new policy check on existing sessions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates think moving the rule to the top of the policy (Option C) will fix the issue, but they overlook that existing sessions are not re-evaluated after a policy change unless session re-aging is enabled.
Detailed technical explanation
How to think about this question
Session re-aging is a feature that allows the firewall to shorten the idle timeout of existing sessions when a policy change occurs, forcing them to be re-evaluated. By default, sessions remain in the session table until they naturally expire (e.g., TCP FIN/RST or timeout). Enabling session re-aging with a short timeout (e.g., 1 second) causes the firewall to immediately age out those sessions, triggering a new policy lookup. This is especially useful when blocking applications like BitTorrent or Skype where long-lived sessions may otherwise bypass a newly applied rule.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Manage, Monitor and Operate — This question tests Manage, Monitor and Operate — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable session re-aging and set a short timeout for the application — Option D is correct because session re-aging forces the firewall to re-evaluate existing sessions against the current security policy. When a new policy is pushed, sessions established before the push continue to match the old policy until they expire. By enabling session re-aging and setting a short timeout, the firewall will age out those sessions sooner, causing them to be re-matched against the new 'app-block-rule' and thus be blocked.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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