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Exam PCNSE topic 1 question 583 discussion

Actual exam question from Palo Alto Networks's PCNSE
Question #: 583
Topic #: 1
[All PCNSE Questions]

A firewall engineer is configuring quality of service (QoS) policy for the IP address of a specific server in an effort to limit the bandwidth consumed by frequent downloads of large files from the internet.

Which combination of pre-NAT and/or post-NAT information should be used in the QoS rule?

  • A. Pre-NAT source IP address -
    Pre-NAT source zone
  • B. Post-NAT source IP address -
    Pre-NAT source zone
  • C. Pre-NAT source IP address -
    Post-NAT source zone
  • D. Post-NAT source IP address -
    Post-NAT source zone
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Suggested Answer: B 🗳️
by b53fdf1 at March 28, 2024, 12:05 p.m.

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b53fdf1
Highly Voted 1 month, 2 weeks ago
Selected Answer: A
If you want to apply QoS treatment to traffic based on source, you must specify the pre-NAT source address (such as pre-NAT source IP, pre-NAT source zone, pre-NAT destination IP, and post-NAT destination zone) in a QoS policy rule. https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-admin/quality-of-service/configure-qos
upvoted 5 times
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hcir
Most Recent 2 weeks ago
all policies except NAT policies use the post-nat destination zone to evaluate. This is because the NAT policy is the first one to be evaluated, and should there be destination nat, the destination zone should be used.
upvoted 1 times
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