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Exam SD-WAN-Engineer Topic 1 Question 23 Discussion

Actual exam question for Palo Alto Networks's SD-WAN-Engineer exam
Question #: 23
Topic #: 1
Which component of the Prisma SD-WAN solution is responsible for the deep application identification (App-ID) and the generation of flow metrics (Network Transfer Time, Server Response Time) at the branch?

Suggested Answer: C Vote an answer

Comprehensive and Detailed Explanation
The ION Device Data Plane (the software running locally on the hardware appliance at the branch) is the component responsible for the heavy lifting of traffic analysis.
Edge Processing: Prisma SD-WAN uses an "Application-Defined" architecture. The ION device performs Deep Packet Inspection (DPI) on the first few packets of a flow to identify the application (e.g., distinguishing "Skype Video" from "Skype Chat").
Metric Calculation: The ION device timestamping engine calculates the performance metrics (RTT, NTT, SRT) in real-time as packets pass through its interfaces. It aggregates this metadata.
Role of Controller (B): The Controller collects and visualizes this data (Analytics), but it does not generate it. The Controller does not sit in the data path of the user traffic. If the ION relied on the controller for App-ID, latency would be unacceptably high. Therefore, all detection and metric generation happens locally on the ION Device.

by Aubrey at Dec 23, 2025, 10:27 PM

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