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NEW QUESTION # 17
An administrator has configured a Path Policy for "ERP_Traffic". The policy allows two public internet links, "ISP-A" and "ISP-B", both marked as "Active". The Path Quality Profile (SLA) requires a latency of less than 150ms. Currently, both ISP-A and ISP-B have a latency of 40ms, well within the SLA.
How does the Prisma SD-WAN ION determine which link to use for a new flow of "ERP_Traffic" when both active paths meet the SLA requirements?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
Prisma SD-WAN utilizes a sophisticated decision engine for Application-Based Path Selection that goes beyond simple failover. When configuring a Path Policy, the administrator defines "Active" paths and a "Path Quality Profile" (SLA).
SLA Compliance (The Filter): First, the system filters the available paths based on the Path Quality Profile. In this scenario, both ISP-A and ISP-B have 40ms latency against a 150ms threshold. Both are "green" or compliant paths.
Selection Criteria (The Tie-Breaker): When multiple paths are configured as "Active" and all meet the performance SLA, the ION device aims to optimize the overall user experience and network utilization. The default behavior for load balancing across healthy, compliant active paths is to select the path with the highest available bandwidth capacity.
By steering new flows to the link with the most "headroom" (available Mbps), the system prevents the saturation of a smaller link (e.g., a 20Mbps DSL line) while a larger link (e.g., 1Gbps Fiber) sits underutilized. This maximizes the aggregate throughput for the site. While latency is the qualifier, bandwidth availability is often the selector for compliant paths. Note that if the application was defined as "Real-Time" and configured for packet duplication, behavior would differ, but for standard traffic, capacity-based distribution is the standard active/active logic.
NEW QUESTION # 18
What is the default action for real-time media applications if link performance is poor?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
According to the Prisma SD-WAN Performance Policy Default Behavior documentation, the default action configured for applications (including real-time media) when a path experiences poor performance (violates the SLA thresholds for latency, jitter, or packet loss) is to Move Flows.
The Prisma SD-WAN ION device continuously monitors the health of all available paths. If the active path for a media application degrades and fails to meet the specified SLA, the default policy dictates that the traffic should be steered (moved) to an alternate, compliant path that meets the performance criteria.
While Forward Error Correction (FEC) is a powerful feature available in Prisma SD-WAN to mitigate packet loss for real-time applications, it is an optional action that must be explicitly enabled or configured within the performance policy rules. It is not the default action in the base system configuration; the primary default mechanism for handling performance issues is to leverage the multi-path fabric to switch to a better link.
Reference: Prisma SD-WAN Administrator's Guide: Performance Policy Default Behavior
NEW QUESTION # 19
A network administrator is viewing the Flow Browser to investigate a report that a specific user cannot access an internal web server. The flow entry for this traffic shows the "Flow State" as "INIT" and it remains in that state until it times out.
What does the "INIT" state indicate about the traffic flow?
Answer: C
Explanation:
Comprehensive and Detailed Explanation
In the Prisma SD-WAN Flow Browser, the Flow State provides a real-time snapshot of the TCP/UDP session lifecycle.
INIT (Initialization): This state indicates that the ION device has seen the initial packet of a new session (typically a TCP SYN) originating from the client (Source), but it has not yet seen a return packet (such as a TCP SYN-ACK) from the destination server.
Diagnosis: A flow stuck in INIT is a classic indicator of a "Blackhole" or reachability issue downstream. It implies that the ION successfully routed the packet out toward the destination, but the destination did not reply. Common causes include:
The server is offline.
A firewall in the path (or on the server itself) is dropping the traffic.
Routing is broken on the return path (asymmetric routing where the return traffic bypasses the ION).
If the flow had been denied by the ION's own firewall (Option C), the state would typically show as DENY or REJECT. If the handshake completed (Option A), the state would be ESTABLISHED. Therefore, INIT points to a lack of response from the remote end.
NEW QUESTION # 20
Which troubleshooting step should be taken when users at a branch site are experiencing a maximum throughput of 200 Mbps for Direct Internet Access (DIA) traffic on a 1 Gbps internet connection?
Answer: C
Explanation:
In Prisma SD-WAN, the effective throughput for any given circuit is fundamentally dictated by the Circuit Configuration defined at the site level. When a branch experiences a "throughput ceiling" (e.g., traffic capped at 200 Mbps on a 1 Gbps physical link), the most likely cause is that the software-defined bandwidth limit for that circuit has been set incorrectly in the Prisma SD-WAN Controller.
Prisma SD-WAN ION devices do not simply forward traffic at the maximum physical line rate by default; they rely on the administrator-defined Upstream and Downstream bandwidth values to perform traffic shaping, policing, and path selection. If a circuit is physically capable of 1 Gbps but is configured in the portal as having only 200 Mbps, the ION device will enforce this 200 Mbps limit to prevent oversubscribing the link and to ensure that Quality of Service (QoS) and path selection calculations remain accurate based on the assumed capacity.
To resolve this, an engineer must navigate to the Site Configuration, locate the specific WAN circuit, and verify that the bandwidth settings match the actual service provider's handoff. If these values are set lower than the actual link speed, the device will artificially throttle the traffic. While ensuring the WAN interface is set to the correct speed/duplex (Option B) is a valid physical layer check, and QoS/Performance policies (Options A and C) manage how that bandwidth is used, it is the Circuit Configuration that defines the total available bandwidth for the SD-WAN fabric to utilize. Correcting this configuration allows the ION device to scale its throughput to match the full 1 Gbps capability of the broadband connection.
NEW QUESTION # 21
In the Prisma SD-WAN portal, the Application Health dashboard assigns a color-coded "Health Score" (Green, Yellow, Red) to applications.
Which three metrics are combined to calculate this composite AppX (Application Experience) score? (Choose three.)
Answer: A,D,E
Explanation:
Comprehensive and Detailed Explanation
The AppX (Application Experience) score is a proprietary metric used by Prisma SD-WAN to provide a holistic view of user experience, rather than just network statistics. It is calculated based on three key components:
Transaction Failure Rate (A): The percentage of application transactions that failed (e.g., TCP resets, HTTP 500 errors). This indicates availability.
Network Transfer Time (B): The time taken for packets to traverse the network (WAN/LAN latency). This indicates network health.
Server Response Time (C): The time taken by the application server to respond to a request. This indicates backend performance.
Why not D or E?
Bandwidth Utilization (D) is a capacity metric, not a direct measure of quality. A link can be 90% full but still deliver packets quickly (good AppX), or 10% full but dropping packets (bad AppX).
Jitter (E) is a network-layer metric primarily relevant for UDP Real-Time media. While important, the high-level "AppX" score for general TCP apps focuses on the "Time-to-Glass" metrics (NTT/SRT) and success rates.
NEW QUESTION # 22
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